CN116793776A - Analysis system and method for dynamic evolution of strain of ultrahigh-temperature deformed microstructure of material - Google Patents
Analysis system and method for dynamic evolution of strain of ultrahigh-temperature deformed microstructure of material Download PDFInfo
- Publication number
- CN116793776A CN116793776A CN202210269097.0A CN202210269097A CN116793776A CN 116793776 A CN116793776 A CN 116793776A CN 202210269097 A CN202210269097 A CN 202210269097A CN 116793776 A CN116793776 A CN 116793776A
- Authority
- CN
- China
- Prior art keywords
- speckle
- sample
- test
- strain
- temperature
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000000463 material Substances 0.000 title claims abstract description 197
- 238000000034 method Methods 0.000 title claims abstract description 97
- 238000004458 analytical method Methods 0.000 title claims abstract description 69
- 238000012360 testing method Methods 0.000 claims abstract description 103
- 230000007246 mechanism Effects 0.000 claims abstract description 73
- 230000008569 process Effects 0.000 claims abstract description 67
- 238000011065 in-situ storage Methods 0.000 claims abstract description 63
- 238000006073 displacement reaction Methods 0.000 claims abstract description 32
- 238000002360 preparation method Methods 0.000 claims abstract description 20
- 238000011068 loading method Methods 0.000 claims description 32
- 238000010438 heat treatment Methods 0.000 claims description 20
- 238000005520 cutting process Methods 0.000 claims description 19
- 238000009826 distribution Methods 0.000 claims description 16
- 239000003973 paint Substances 0.000 claims description 11
- 239000007921 spray Substances 0.000 claims description 11
- 238000005507 spraying Methods 0.000 claims description 11
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 10
- 244000137852 Petrea volubilis Species 0.000 claims description 10
- 230000006835 compression Effects 0.000 claims description 9
- 238000007906 compression Methods 0.000 claims description 9
- 238000012216 screening Methods 0.000 claims description 9
- 239000002245 particle Substances 0.000 claims description 8
- 238000012545 processing Methods 0.000 claims description 8
- 238000004364 calculation method Methods 0.000 claims description 7
- 238000000227 grinding Methods 0.000 claims description 6
- 229910052786 argon Inorganic materials 0.000 claims description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 5
- 230000003647 oxidation Effects 0.000 claims description 5
- 238000007254 oxidation reaction Methods 0.000 claims description 5
- 239000001301 oxygen Substances 0.000 claims description 5
- 229910052760 oxygen Inorganic materials 0.000 claims description 5
- 238000007781 pre-processing Methods 0.000 claims description 3
- 238000002203 pretreatment Methods 0.000 claims description 3
- 238000010926 purge Methods 0.000 claims description 3
- 230000007613 environmental effect Effects 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 abstract description 19
- 238000009864 tensile test Methods 0.000 abstract description 8
- 238000004519 manufacturing process Methods 0.000 abstract 1
- 230000000977 initiatory effect Effects 0.000 description 11
- 238000011160 research Methods 0.000 description 10
- 230000008859 change Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- 238000005259 measurement Methods 0.000 description 6
- 230000009471 action Effects 0.000 description 4
- 230000006399 behavior Effects 0.000 description 4
- 238000011161 development Methods 0.000 description 4
- 230000000007 visual effect Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000011259 mixed solution Substances 0.000 description 3
- 239000011858 nanopowder Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- 230000001808 coupling effect Effects 0.000 description 2
- 239000002270 dispersing agent Substances 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000003384 imaging method Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000007373 indentation Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000000691 measurement method Methods 0.000 description 2
- 239000002105 nanoparticle Substances 0.000 description 2
- 238000005498 polishing Methods 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 239000013598 vector Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000005314 correlation function Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 235000019441 ethanol Nutrition 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 150000002367 halogens Chemical class 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000009662 stress testing Methods 0.000 description 1
- 238000004506 ultrasonic cleaning Methods 0.000 description 1
Landscapes
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention provides an analysis system and a method for dynamic evolution of strain of a material ultra-high temperature deformation microstructure, wherein the system utilizes a sample preparation mechanism to cut a sheet-shaped material to be tested, and preprocesses the sheet-shaped material to obtain an effective material sample according to test requirements; manufacturing high-contrast random speckles for a material sample through a test speckle forming mechanism; then, carrying out in-situ tensile test on the speckle material sample in the ultra-high temperature environment based on the set displacement rate by an in-situ tensile observation mechanism, and carrying out real-time observation on video and dynamic images of the sample by adopting a laser scanning confocal microscope; finally, analyzing the dynamic image in the testing process based on the DIC algorithm by a deformation strain evolution analysis module, constructing a displacement field on the surface of the speckle material sample and calculating a corresponding strain field; the method overcomes the comprehensive limitation in the traditional technology, can precisely observe the microscopic failure mechanism of the ultra-high temperature material, has higher practicability, and can further and reliably analyze the evolution of the strain field of the deformation of various materials.
Description
Technical Field
The invention relates to the technical field of material failure observation and analysis, in particular to an analysis system and an analysis method for dynamic evolution of material ultrahigh temperature deformation microstructure strain, which are used for in-situ observation of the surface tissue structure, strain evolution, crack initiation, expansion, failure and other phenomena of a material when the material is subjected to a tensile/compressive (fatigue) load under an ultrahigh temperature condition and analysis of an evolution rule.
Background
The microstructure state of the material interacts with the service environment (such as the coupling effect of the material with a temperature field and a stress field) to directly influence the service performance and service life of the material. In recent years, in-situ test technology capable of accurately simulating the service condition of a material is continuously researched in the field, microscopic test research of the surface structure of the material is realized, the change condition of the microstructure of the surface of the material under the action of an external field is observed under different scales, and the fracture and damage behaviors of the material under the action of loading are obtained.
There is a close relationship between the stress and strain characteristics of a material and its failure behavior, and in particular the stress and strain states of a material in the micrometer scale micro-domain are often used to explain macroscopic failure phenomena. At present, the conventional test technology is difficult to realize micron-level stress strain test and analysis, and recently, the newly developed Electron Back Scattering Diffraction (EBSD) technology becomes a powerful means for analyzing the stress strain state of a micro-area, and the problem of stress strain concentration in the deformation process can be studied by utilizing a Scanning Electron Microscope (SEM) with an in-situ stretching table, but the highest test temperature allowed by the scanning electron microscope under a high-temperature environment is 1200 ℃, and the test requirement of ultra-high-temperature stretching in-situ observation cannot be met. In addition, the EBSD technique measures lattice strain, and analysis of plastic strain of materials cannot be achieved.
The information disclosed in the background section of the invention is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Disclosure of Invention
In order to solve the problems, the invention provides an analysis system for dynamic evolution of strain of a material ultra-high temperature deformation microstructure, which is used for carrying out in-situ observation and analysis on the processes of tissue evolution, dynamic evolution of strain and the like of the material deformation process at ultra-high temperature in a mode of combining an ultra-high temperature laser scanning confocal microscope with DIC analysis technology, and revealing the mechanism of crack initiation and development at ultra-high temperature from a microscopic scale, thereby providing an effective research method for microscopic failure mechanism research of the ultra-high temperature material. In one embodiment, the system comprises:
the sample preparation mechanism is configured to cut a sheet-shaped material to be tested, and pretreat the sheet-shaped material to obtain an effective material sample according to the test requirement so as to put into test and realize the ultrahigh temperature deformation test of the material;
a test speckle forming mechanism configured to produce high-contrast random speckle for the obtained material sample, to obtain a speckle material sample; the speckles are speckles particles with the size of submicron/nanometer level and stable performance;
The in-situ stretching and observing mechanism is configured to perform in-situ stretching and testing on the speckle material sample based on a set displacement rate by utilizing a high-temperature stretching and compressing system in an environment cavity of the high-temperature heating furnace, and a laser scanning confocal microscope is adopted to observe and store videos and dynamic images of the sample in real time in the testing process;
the deformation strain evolution analysis module is connected with the in-situ stretching observation mechanism and is configured to analyze dynamic images of the testing process based on a DIC algorithm, construct a displacement field of the surface of the speckle material sample and calculate a corresponding strain field.
Preferably, the sample preparation mechanism comprises a material cutting module and a material processing module;
the material cutting module is used for cutting sheet materials with set sizes from the plates in a linear cutting mode according to the experimental requirements of ultrahigh-temperature in-situ observation;
the material processing module is configured to grind two sides of the cut sheet material by using a sand paper grinding device, one side is selected as an observation surface, and the sheet material is ground step by using a metallographic sand paper device until the observation requirement is met; and then marking the observation area on the observation surface by using a marking device, wherein the marking device is a microhardness meter.
Further, the test speckle forming mechanism comprises:
the primer spraying module is configured to uniformly spray a matte high-temperature primer with set thickness on an observation surface of a material test when the surface of a material sample is ensured to be clean and no dirt is attached;
a speckle spray module configured to further spray a dispersed and randomly distributed high contrast high temperature paint over the high temperature primer.
As a further improvement of the invention, the test speckle forming mechanism further comprises
And the speckle sample baking module adopts a muffle furnace and is used for baking the material sample sprayed with the speckle at a constant temperature according to a set temperature and a set time length so as to ensure that the speckle has high-temperature stability.
Further, the in-situ stretching observation mechanism comprises a stretching compression workbench and two loading mechanisms, wherein the stretching compression workbench and the two loading mechanisms are arranged in the environment cavity of the high-temperature heating furnace;
the loading mechanism is used for installing a speckle material sample, the first loading mechanism is fixed on the stretching and compressing workbench, and the other loading mechanism is connected with a linear driver of the high-temperature stretching and compressing system.
Optionally, the laser scanning confocal microscope of the in-situ stretching observation mechanism adopts violet laser VL2000DX, the wavelength is 408nm, and the scanning speed can reach 15-120 frames per second.
Further, the in-situ stretch viewing mechanism also includes a test pre-treatment module configured to evacuate the vacuum chamber and purge with ultra-high purity argon to reduce oxygen content after mounting the sample of speckle material on the loading mechanism and prior to heating, to protect the sample surface from oxidation.
As a further improvement of the invention, the marking area of the material sample is tracked in real time when the laser scanning confocal microscope shoots, the marking area is always positioned in the center of the visual field in the whole stretching process, the observation video is stored in real time, pictures at corresponding moments are stored according to set time intervals, and meanwhile, the stretching curve of the test is recorded in real time.
Preferably, the deformation strain evolution analysis module comprises an image screening unit and a strain analysis unit;
the image screening unit is configured to screen the surface photos of the material in the in-situ stretching process obtained by the ultra-high temperature laser scanning confocal microscope, and select effective speckle images with gray distribution meeting the set requirements;
the strain analysis unit is configured to calculate the screened effective speckle images by using a DIC algorithm, so as to realize the matching of deformation points on the surface of the object, and reconstruct coordinates of calculation points on the surface of the object according to parallax data of all corresponding points; and the displacement field of the object surface is obtained by comparing the coordinate changes of each point in each deformation state measuring area, and then the strain field of the object surface is obtained by calculating with GOM software and VIC-2D software.
Based on the application aspect of the system in any one or more embodiments, the invention further provides an analysis method for dynamic evolution of strain of the ultrahigh temperature deformation microstructure of the material, which comprises the following steps:
the preparation method comprises the steps of sample preparation, preprocessing a sheet-shaped material to be tested according to test requirements after cutting the material to be tested to obtain an effective material sample, and putting the material sample into a test to realize a material ultra-high temperature deformation test;
a test speckle forming step of preparing high-contrast random speckle for the obtained material sample to obtain a speckle material sample; the speckles are speckles particles with the size of submicron/nanometer level and stable performance;
in-situ stretching observation, namely in-situ stretching test is carried out on the speckle material sample by utilizing a high-temperature stretching compression system based on a set displacement rate in an environment cavity of a high-temperature heating furnace, and a laser scanning confocal microscope is adopted to observe and store videos and dynamic images of the sample in real time in the test process;
and a deformation strain evolution analysis step, which is configured to analyze dynamic images of the testing process based on a DIC algorithm, construct a displacement field of the surface of the speckle material sample and calculate a corresponding strain field.
Compared with the closest prior art, the invention has the following beneficial effects:
According to the analysis system and the analysis method for dynamic evolution of the strain of the ultra-high temperature deformation microstructure of the material, disclosed by the invention, after the sheet-shaped material to be measured is cut and preprocessed to obtain an effective material sample, a high-contrast random speckle is manufactured on the material sample through the test speckle forming mechanism, so that a foundation is provided for realizing the evolution analysis of a material tensile stress field based on a DIC algorithm, and meanwhile, the quality and the stability of an observation image can be improved;
further, carrying out in-situ tensile test on the speckle material sample in the ultra-high temperature environment based on the set displacement rate, and adopting a laser scanning confocal microscope to observe the video and the dynamic image of the sample in real time; finally, analyzing the dynamic image in the testing process based on the DIC algorithm by a deformation strain evolution analysis module, constructing a displacement field on the surface of the speckle material sample and calculating a corresponding strain field; the problem that a conventional DIC test cannot observe a microstructure by adopting a high-speed camera is solved, the test temperature limitation existing in the traditional technology is broken through, the microscopic failure mechanism of the ultra-high temperature material can be observed in a refined mode, the practicability is higher, and further reliable analysis on the strain dynamic evolution and crack initiation mechanism of the tensile deformation failure process of various materials under the ultra-high temperature condition can be realized.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate the invention and together with the embodiments of the invention, serve to explain the invention, without limitation to the invention. In the drawings:
FIG. 1 is a schematic diagram of an analysis system for dynamic strain evolution of ultra-high temperature deformed microstructure of a material according to an embodiment of the present invention;
FIG. 2 is a diagram illustrating dimensions of a sample of a material for an analysis system for dynamic evolution of strain in ultra-high temperature deformed microstructure of the material according to an embodiment of the present invention;
FIG. 3 is a diagram showing an example of speckle preparation of an analysis system for dynamic evolution of strain in ultra-high temperature deformed microstructure of a material according to another embodiment of the present invention;
FIG. 4 is a diagram showing the composition of an in-situ tensile observation mechanism of an analysis system for dynamic evolution of strain of an ultrahigh temperature deformed microstructure of a material according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of DIC algorithm of an analysis system for dynamic strain evolution of ultra-high temperature deformed microstructure of a material according to an embodiment of the present invention;
fig. 6 is a flow chart of an analysis method for dynamic strain evolution of a material ultra-high temperature deformation microstructure according to another embodiment of the present invention.
Detailed Description
The following will explain the embodiments of the present invention in detail with reference to the drawings and examples, so that the practitioner of the present invention can fully understand how to apply the technical means to solve the technical problems, achieve the implementation process of the technical effects, and implement the present invention according to the implementation process. It should be noted that, as long as no conflict is formed, each embodiment of the present invention and each feature of each embodiment may be combined with each other, and the formed technical solutions are all within the protection scope of the present invention.
Although a flowchart depicts operations as a sequential process, many of the operations can be performed in parallel, concurrently, or at the same time. The order of the operations may be rearranged. The process may be terminated when its operations are completed, but may have additional steps not included in the figures. The processes may correspond to methods, functions, procedures, subroutines, and the like.
The terms "first," "second," and the like may be used herein to describe various elements, but these elements should not be limited by these terms, and these terms are used merely to distinguish one element from another. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items. When an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may be present.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used herein, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
The microstructure of the material interacts with the service environment (such as coupling action with a temperature field and a stress field) to directly influence the service performance and service life of the material. In recent years, in-situ test technology capable of simulating the service condition of a material is developed at home and abroad, the loading effect is combined with microscopic test research of the surface structure of the material, the microstructure evolution characteristics of the surface of the material under the action of an external field are tracked and observed in real time under different scales, and the deformation mechanism and fracture and damage behaviors of the material are analyzed. There is a close relationship between the stress and strain characteristics of a material and its failure behavior, and in particular the stress and strain states of a material in the micrometer scale micro-domain are often used to explain macroscopic failure phenomena. Currently, conventional test technology is difficult to realize micron-scale stress strain test and analysis, and recently, newly developed Electron Back Scattering Diffraction (EBSD) technology becomes a powerful means for analyzing the stress strain state of a micro-region. The Scanning Electron Microscope (SEM) with the in-situ stretching table and the EBSD technology can be used for researching the problem of stress strain concentration in the deformation process, but the highest temperature allowed by the scanning electron microscope in a high-temperature environment is 1200 ℃, and the test requirement of ultra-high temperature stretching in-situ observation cannot be met. Furthermore, EBSD techniques measure lattice strain, not plastic strain. And at present, a method for analyzing the tissue strain distribution and dynamic evolution process of the material on the basis of observing the ultrahigh-temperature tissue change and crack initiation and propagation process of the material is lacking.
For example, CN112881195a provides a cold and hot in-situ tensile microscopic stress testing system, which can realize a tensile experiment and observation under a set temperature environment, an imaging lens of a DIC microscopic strain measuring system is arranged opposite to a transparent window of a tensile cavity, and a digital image correlation method and a binocular microscope technology are combined to microscopic observe and measure three-dimensional coordinates, displacement and strain of a sample surface in a sample deformation process in the tensile cavity. Although the temperature and humidity stability in the stretching cavity can be realized and the temperature and humidity stability in the stretching cavity can be flexibly regulated according to test requirements, the DIC microscopic strain measurement system images and damages the test process in real time, but the available test temperature conditions have limitations, the stretching strain of the material in the ultra-high temperature environment cannot be measured, and the analysis of the tissue strain distribution and dynamic evolution process of the material cannot be realized on the basis of observing the ultra-high temperature tissue change and crack initiation and propagation processes of the material.
The technical staff of the invention consider that a Laser Scanning Confocal Microscope (LSCM) can observe the changes of the surface tissue and the gold phase of a material and the phenomena of initiation, expansion, failure and the like of cracks when the LSCM is subjected to stretching/compression (fatigue) external force at high temperature in real time and continuously, and can simultaneously realize real-time, in-situ and high-definition observation and analysis of the change of the tissue structure of the material at high temperature and even ultrahigh temperature.
Based on the method, the scheme for realizing dynamic evolution analysis of the strain of the ultra-high temperature deformation microstructure of the material by combining the ultra-high temperature laser scanning confocal microscope with the DIC technology is provided, the tissue evolution and the dynamic evolution process of the strain of the material in the ultra-high temperature deformation process are analyzed, the crack initiation and development mechanism in the ultra-high temperature can be revealed from a microscopic scale, and the problems that the deformation tissue of the ultra-high temperature (above 1200 ℃) material cannot be researched and the dynamic evolution process of the strain is difficult to effectively analyze by the existing in-situ observation technology are solved.
The detailed flow of the analysis system of the embodiment of the present invention is described in detail below based on the drawings. Although the logical order of operations are depicted in the system operational principle, in some cases the operations shown or described may be performed in a different order than is depicted.
Example 1
Fig. 1 shows a schematic structural diagram of an analysis system for dynamic evolution of strain in a microstructure deformed by ultrahigh temperature of a material according to an embodiment of the present invention, and referring to information in fig. 1, it can be known that the system includes:
the sample preparation mechanism is configured to cut a sheet-shaped material to be tested, and pretreat the sheet-shaped material to obtain an effective material sample according to the test requirement so as to put into test and realize the ultrahigh temperature deformation test of the material;
A test speckle forming mechanism configured to produce high-contrast random speckle for the obtained material sample, to obtain a speckle material sample; the speckles are speckles particles with the size of submicron or nanometer level and stable performance;
the in-situ stretching and observing mechanism is configured to perform in-situ stretching and testing on the speckle material sample based on a set displacement rate by utilizing a high-temperature stretching and compressing system in an environment cavity of the high-temperature heating furnace, and a laser scanning confocal microscope is adopted to observe and store videos and dynamic images of the sample in real time in the testing process;
the deformation strain evolution analysis module is connected with the in-situ stretching observation mechanism and is configured to analyze dynamic images of the testing process based on a DIC algorithm, construct a displacement field of the surface of the speckle material sample and calculate a corresponding strain field.
Based on the analysis system, the high-resolution image in the material deformation process can be obtained in real time by adopting the ultra-high temperature laser scanning confocal microscope, so that the problem that a traditional DIC test cannot observe a microstructure by adopting a high-speed camera is solved, on the other hand, the problem that the dynamic evolution process of the material deformation strain can not be researched by adopting an SEM+EBSD means in a mode of combining the ultra-high temperature laser scanning confocal microscope with a DIC analysis technology is solved, an effective research scheme is provided for microscopic failure mechanism research of the ultra-high temperature material, the method can be effectively applied to various requirement scenes in the material failure analysis field, and an effective observation method is provided for the research on the dynamic evolution of the material deformation failure process and crack initiation mechanism under the ultra-high temperature condition.
In a preferred embodiment, the sample preparation mechanism comprises a material cutting module and a material processing module;
the material cutting module is used for cutting sheet materials with set sizes from the plates in a linear cutting mode according to the experimental requirements of ultrahigh-temperature in-situ observation;
the material processing module is configured to grind two sides of the cut sheet material by using a sand paper grinding device, one side is selected as an observation surface, and the sheet material is ground step by using a metallographic sand paper device until the observation requirement is met; and then marking the observation area on the observation surface by using a marking device, wherein the marking device is a microhardness meter.
Specifically, in practical application, according to the experimental requirement of ultra-high temperature in-situ observation, an in-situ tensile sample is cut from a plate in a linear cutting mode (the size of a selected sheet sample is shown in fig. 2), the length of a gauge length section is 17mm, the width is 5mm, and the thickness is 1.5mm. In order to facilitate the mounting of the sample to the loading device of the in-situ tensile observation mechanism, a hole with a diameter of 5.1mm is reserved at a position set by the sample clamping end for clamping (loading and unloading) of the sample to the loading device.
The sheet sample required by the high-temperature stretching experiment is shown in figure 2, the size is standard, and in practical application, the length, the width and the thickness of the middle part can be properly changed except that the sizes of the two ends and the size of the reserved hole are fixed corresponding to the requirement.
And then adopting metallographic sand paper to grind two sides of the sample flat, wherein one surface is selected as an observation surface, the sample is ground to 2000 meshes step by using the metallographic sand paper, and then mechanical polishing treatment is carried out to a mirror surface state so as to realize fine observation.
Further, in the embodiment of the invention, the micro-hardness meter is adopted to prepare the indentations at 4 corners of the observation area for marking, and the preparation load can be set to be 0.5N when the indentations are prepared. The invention adopts the microhardness meter to prepare the mark of the observation area, on the basis of ensuring the position accuracy of the mark, the mark effectiveness of the observation area can not be affected even if the material sample is deformed in the tensile test process, and the stability can be maintained even in an ultra-high temperature environment.
After the sample is prepared, removing surface impurities through alcohol cleaning or ultrasonic cleaning, and drying to remove surface moisture.
After a material sample with a clean observation surface meeting test requirements is obtained, in order to obtain a high-contrast random gray distribution image, the surface of the sample must have random characteristics, and before measurement, a measured object needs to be subjected to spot spraying treatment; in one embodiment, the test speckle forming mechanism comprises:
The primer spraying module is configured to uniformly spray a matte high-temperature primer with set thickness on an observation surface of a material test when the surface of a material sample is ensured to be clean and no dirt is attached;
a speckle spray module configured to further spray a dispersed and randomly distributed high contrast high temperature paint over the high temperature primer.
Further, in a preferred embodiment, the test speckle forming mechanism further comprises
And the speckle sample baking module adopts a muffle furnace and is used for baking the material sample sprayed with the speckle at a constant temperature according to a set temperature and a set time length so as to ensure that the speckle has high-temperature stability.
In practical application, the invention can firstly spray a layer of white high-temperature paint on the sample as the primer, and then spray dispersed and randomly distributed black high-temperature paint on the primer. In order to improve the deformation measurement sensitivity and the spatial resolution of the speckle photography technology, the invention prepares the speckle particles with the size of submicron/nanometer level and stable performance, and simultaneously, in order to ensure the stability of the prepared high-temperature speckle, the sample is baked in a muffle furnace, the baking temperature is 230 ℃, the baking time is 30min, and the invention provides basic support for effectively developing the ultra-high temperature test.
The quality of the speckles directly affects the accuracy of analysis results, and it is important to prepare a high-quality speckle pattern for obtaining reliable test observation results, and the invention sets up to prepare high-quality speckles meeting the following rules:
(1) Random scattered spots: scattered spots need to be randomly distributed rather than regularly arranged;
(2) High contrast: the more obvious the black-and-white contrast is, the better;
(3) The size is uniform: the sizes of the scattered spots are required to be consistent, so that the occurrence of different scattered spot sizes is avoided as much as possible;
(4) 50% of: black and white account for 50%, and if the surface color of the sample is white, black speckles need to be made.
In particular, high quality specks meeting the above conditions can be prepared using the nanopowder and dispersant by:
the speckle material used in the preparation process comprises: nano-powder (e.g. nano SiO) 2 ) The device comprises an ultrasonic cleaner and a dropper.
The preparation operation comprises the following steps: polishing the surface of the sample to be tested to a bright mirror surface without scratches; fully mixing the nano powder and the dispersing agent according to different proportions of requirements, and uniformly dispersing by utilizing ultrasonic; the surface to be measured after the treatment is kept horizontal, a part of the dispersed mixed solution is taken as the mixed solution of the speckles to be measured and vertically dripped on the surface to be measured, so that the mixed solution on the surface to be measured is freely spread, then the liquid drops on the surface to be measured are sucked from the edges of the liquid drops by filter paper, the surface to be measured is slowly inclined for 40-80 degrees, the surface to be measured is rinsed by absolute ethyl alcohol, and then the surface to be measured is quickly dried, so that the speckles can be obtained on the surface to be measured;
In addition, in order to ensure that the speckle finished product put into the tensile test is qualified, after the speckle is prepared, a plurality of samples can be prepared in the same group, a microscopic photo of the surface to be tested is also taken, an image of the sample is analyzed to identify whether the nano particles are uniformly distributed, if the number of samples, of which the occupied area of the nano particles is 30% -50%, in the photo reaches a set value, the requirements are met, and if all the requirements are not met, the parameters of the preparation operation are adjusted to be prepared again according to the steps until the prepared speckle meets the conditions, and the corresponding preparation operation parameters are applied to sample treatment before the tensile test.
If one speckle size is 5 pixels, then its distance from the next speckle should also be 5 pixels (5 pixels black, 5 pixels white), as shown in FIG. 3.
Further, in order to improve deformation measurement sensitivity and spatial resolution, the invention prepares speckle particles with a dimension in submicron/nanometer level and stable performance. The specific operation method for preparing the speckles comprises the following steps:
(1) Ensuring that the surface of the tested sample is clean and has no dirt adhesion;
(2) Spraying a layer of white high-temperature paint on the sample to serve as a primer, and shaking uniformly before spraying the paint, so that a clamping block phenomenon is avoided in the paint spraying process;
(3) Uniformly spraying white matte paint, wherein the required thickness is not too thick or too thin;
(4) Then spraying dispersed and randomly distributed black high-temperature paint on the white primer; in order to ensure the stability of the prepared high-temperature speckles, the sample after the speckles are prepared is placed in a muffle furnace for baking at 230 ℃ for 30min.
In the high-temperature stretching in-situ observation test process, the tissue change and failure process of the sample surface can be directly observed through a laser scanning confocal microscope, but strain evolution analysis cannot be performed. The DIC technology is used as a non-contact measurement method, and can realize the measurement of full-field strain; speckle is produced on the sample surface to facilitate pixel tracking by the DIC method.
After a material sample with random speckles is obtained, the material sample is placed in an in-situ stretching observation mechanism to carry out in-situ stretching test.
In one embodiment, as shown in fig. 4, the in-situ stretching and observing mechanism comprises a stretching and compressing workbench and two loading mechanisms, wherein the stretching and compressing workbench and the two loading mechanisms are arranged in the environment cavity of the high-temperature heating furnace;
the loading mechanism is used for installing a speckle material sample, the first loading mechanism is fixed on the stretching and compressing workbench, and the other loading mechanism is connected with a linear driver of the high-temperature stretching and compressing system; the high-temperature heating furnace is mainly used for providing a test environment cavity in a high-temperature stretching and compressing process, and is provided with a stretching and compressing workbench.
In one embodiment, the laser scanning confocal microscope of the in-situ stretching observation mechanism adopts violet laser VL2000DX with the wavelength of 408nm, the scanning speed can reach 15-120 frames per second, and the dynamic image can be observed and stored in real time at high speed.
The high-temperature stretching compression system adopts a double halogen lamp to carry out reflection heating on a sample, and the effective heating area is The loading mechanism in the environmental cavity of the heating furnace is used for installing a small tensile sample. One of the two loading mechanisms is fixed and the other is connected with the linear driver. A constant load or constant displacement rate will be applied to the test specimen at a drive speed of 0.01 to 20mm/min with an effective test stroke of 80mm.
Further, in one embodiment, the in situ stretch viewing mechanism further comprises a test pre-treatment module configured to evacuate the vacuum chamber and purge with ultra-high purity argon to reduce oxygen content after mounting the sample of speckle material on the loading mechanism and prior to heating, to protect the sample surface from oxidation.
Considering that the marking area continuously moves along with the stretching process, in an alternative embodiment, the marking area of the material sample is set to track in real time when the laser scanning confocal microscope shoots, the marking area is always positioned in the center of a visual field in the whole stretching process, an observation video is stored in real time, pictures at corresponding moments are stored according to set time intervals, and meanwhile, a stretching curve of a test is recorded in real time. The tensile curve refers to a tensile curve which can be obtained with time according to data in a file, wherein the computer control system outputs file records for recording relevant data such as load, displacement and the like in the tensile test process.
Taking a certain material sample to be tested as an example, the targeted ultra-high temperature in-situ tensile test is realized through the following steps:
(1) The sample was mounted on a loading jig by means of an ultra-high temperature Laser Scanning Confocal Microscope (LSCM) with a stretching and compression function, and before heating, the vacuum chamber was evacuated and purged with ultra-high purity argon to reduce the oxygen content (nitrogen flow 100 ml/min), protecting the sample surface from oxidation.
(2) Focusing is carried out by adjusting the distance between the lens and the surface of the sample until the lens obtains a clear image; the marking area is positioned at the center of the visual field by adjusting the position of the lens; the magnification is reasonably set, and the magnification is unchanged in the shooting process.
(3) At the time of the test, the temperature in the chamber was measured by a thermocouple. And setting a certain heating rate at the control end according to experimental requirements to enable the temperature to rise to a specified temperature. The control end is also provided with a constant displacement rate, and the sample is stretched at a certain displacement rate at the set experimental temperature until the sample breaks.
(4) During the test, speckle images of each deformation stage of the sample are collected in real time. Because the marked area can continuously move along with the stretching process, the marked area needs to be tracked in real time during shooting; in the whole stretching process, microscopic tissue evolution and crack initiation and expansion processes of the sample surface in the high-temperature stretching process can be observed and recorded in real time through a microscopic imaging system. In the experimental process, the observed video is stored in real time, and one picture is stored every second, wherein the picture format is JPG or PNG. At the same time, the stretch curve was recorded in real time.
And carrying out a tensile test according to the logic until the material test breaks into an invalid state.
In the high-temperature stretching in-situ observation test process, the tissue change and failure process of the sample surface can be directly observed through a laser scanning confocal microscope, but strain evolution analysis cannot be performed.
The DIC technology is used as a non-contact measurement method, and can realize the measurement of full-field strain; furthermore, researchers can analyze part or all of dynamic images in the test process by adopting a deformation strain evolution analysis module according to test requirements in the test development process or after the test is completed, and construct a displacement field on the surface of a speckle material sample and calculate a corresponding strain field based on a DIC algorithm. The Digital Image Correlation (DIC) method is based on a speckle pattern with a distribution of feature points that are coordinates of pixels and gray levels of pixels as information carriers, and before the correlation algorithm runs, a square image sub-area is selected, the center of which is the pixel of interest. In the course of image movement or deformation, the displacement vector at the center point of the sub-region can be obtained by tracking the position of the sub-region of the image in the deformed image (i.e., the target image). By analyzing the displacement vectors of the center points of the sub-areas, a displacement field of the whole analysis area is formed.
As shown in fig. 5, one of the images is used as a reference image, the other image is used as an image to be matched, in the reference image, a rectangular sub-image with the size of (2m+1) x (2m+1) taking the point (x, y) to be matched as the center is taken, in the image to be matched, through a certain searching method, correlation calculation is carried out according to a certain correlation function, and the sub-image with the greatest correlation coefficient with the selected sub-image and the center (x ', y') is searched, wherein the point (x ', y') is the corresponding point of the point (x, y) in the image to be matched.
In one embodiment, the deformation strain evolution analysis module comprises an image screening unit and a strain analysis unit;
the image screening unit is configured to screen the surface photos of the material in the in-situ stretching process obtained by the ultra-high temperature laser scanning confocal microscope, and select effective speckle images with gray distribution meeting the set requirements;
the strain analysis unit is configured to calculate the screened effective speckle images by using a DIC algorithm, so as to realize the matching of deformation points on the surface of the object, and reconstruct coordinates of calculation points on the surface of the object according to parallax data of all corresponding points; and the displacement field of the object surface is obtained by comparing the coordinate changes of each point in each deformation state measuring area, and then the strain field of the object surface is obtained by calculating with GOM software and VIC-2D software.
Specifically, in one embodiment, the strain analysis unit calculates the strain value of each pixel point by adopting GOM software and VIC-2D software; the strain increment of each pixel point under the loading step can be calculated through two adjacent deformed images, and the corresponding strain distribution image and strain increment distribution image are formed by combining an image processing function.
In practical application, firstly, screening a material surface failure photo obtained by an ultra-high temperature Laser Scanning Confocal Microscope (LSCM) in an in-situ stretching process, and selecting a high-quality speckle image with a certain gray level distribution.
The invention utilizes a Digital Image (DIC) correlation algorithm to analyze a photo (selected speckle image with a certain gray level distribution) obtained by in-situ stretching of an ultrahigh temperature Laser Scanning Confocal Microscope (LSCM), realizes the matching of deformation points on the surface of an object, and reconstructs coordinates of calculation points on the surface of the object according to parallax data of each point; and the displacement field of the object surface is obtained by comparing the coordinate changes of each point in each deformation state measuring area, and the strain field of the object surface is further calculated. The method comprises the steps of comparing full-field displacement and strain obtained by a speckle pattern of the surface of a material before and after deformation by using a related algorithm, and realizing research and analysis on microscopic tissue strain distribution and dynamic evolution process of the surface of a sample; and calculating the strain value of each pixel point by using GOM software and VIC-2D software. The strain increment at each pixel point under the loading step can be calculated through two adjacent deformation images. And obtaining a strain distribution image and a strain increment distribution image through the image processing function of the software. The research and analysis of the microstructure strain distribution and dynamic evolution process of the sample surface are realized by comparing the full-field displacement and strain obtained by the speckle patterns before and after the deformation of the material surface under the action of external load or other factors and applying a related algorithm.
The invention solves the problem that the existing SEM combined with EBSD in-situ observation technology can not study the dynamic failure process of the ultra-high temperature (above 1200 ℃), adopts the ultra-high temperature Laser Scanning Confocal Microscope (LSCM) combined with DIC technology, analyzes the strain dynamic evolution of the material deformation process at the ultra-high temperature, and provides an effective method for revealing the crack initiation and development mechanism at the ultra-high temperature. The method can be applied to the field of material failure analysis, and provides reliable observation data for the strain dynamic evolution and crack initiation mechanism research of the material deformation failure process under the ultra-high temperature condition.
In the analysis system for dynamic evolution of the strain of the ultrahigh-temperature deformation microstructure of the material, each module or unit structure can independently or in combination operate according to test requirements and calculation requirements so as to achieve corresponding technical effects.
Example two
The embodiment of the invention disclosed above describes the structure of the system in detail, and based on the operation principle aspect of the system in any one or more embodiments, the invention also provides an analysis method for dynamic evolution of the strain of the ultra-high temperature deformation microstructure of the material, and the method is applied to the analysis system for dynamic evolution of the strain of the ultra-high temperature deformation microstructure of the material in any one or more embodiments. Specific examples are given below for details.
Specifically, fig. 6 shows a flow chart of an analysis method for dynamic strain evolution of a microstructure of ultrahigh temperature deformation of a material, which is provided in an embodiment of the present invention, and as shown in fig. 6, the method includes:
the preparation method comprises the steps of sample preparation, preprocessing a sheet-shaped material to be tested according to test requirements after cutting the material to be tested to obtain an effective material sample, and putting the material sample into a test to realize a material ultra-high temperature deformation test;
a test speckle forming step of preparing high-contrast random speckle for the obtained material sample to obtain a speckle material sample; the speckles are speckles particles with the size of submicron/nanometer level and stable performance;
in-situ stretching observation, namely in-situ stretching test is carried out on the speckle material sample by utilizing a high-temperature stretching compression system based on a set displacement rate in an environment cavity of a high-temperature heating furnace, and a laser scanning confocal microscope is adopted to observe and store videos and dynamic images of the sample in real time in the test process;
and a deformation strain evolution analysis step, which is configured to analyze dynamic images of the testing process based on a DIC algorithm, construct a displacement field of the surface of the speckle material sample and calculate a corresponding strain field.
Further, in one embodiment, the sample preparation step includes:
A material cutting step, namely cutting sheet materials with set sizes from the plate by adopting a linear cutting mode according to the experimental requirements of ultra-high temperature in-situ observation;
a material treatment step, namely carrying out double-sided grinding on the cut sheet material by using a sand paper grinding device, selecting one surface as an observation surface, and carrying out step-by-step grinding by using a metallographic sand paper device until the observation requirement is met; and then marking the observation area on the observation surface by using a marking device, wherein the marking device is a microhardness meter.
In a preferred embodiment, the test speckle forming step comprises:
a step of spraying primer, in which matte high-temperature primer with set thickness is uniformly sprayed on an observation surface of a material test when the surface of a material sample is ensured to be clean and no dirt is attached;
and a speckle spraying step, wherein high-contrast high-temperature paint which is dispersed and randomly distributed is further sprayed on the high-temperature primer.
Further, the test speckle forming step further comprises
And a speckle sample baking step, namely adopting a muffle furnace, and performing constant-temperature baking on the material sample sprayed with the speckle according to the set temperature and the set time length so as to ensure that the speckle has high-temperature stability.
Specifically, in one embodiment, the stretching in-situ observation step comprises the steps of installing the obtained speckle material test on a loading mechanism of a stretching and compressing workbench in an environment cavity of a high-temperature heating furnace, and performing an in-situ stretching test under the control of a linear driver of the high-temperature stretching and compressing system. Wherein, two loading mechanisms are arranged in the environment cavity of the high-temperature heating furnace; the first loading mechanism is fixed on the stretching and compressing workbench, and the other loading mechanism is connected with a linear driver of the high-temperature stretching and compressing system.
The laser scanning confocal microscope of the in-situ stretching observation mechanism adopts purple laser VL2000DX, the wavelength is 408nm, and the scanning speed can reach 15-120 frames per second.
On the other hand, in order to ensure that the state of the test sample for which the test is intended is reliable, there is no interference by other external factors, and therefore, in one embodiment, the tensile in-situ observation step further comprises a test pretreatment step: after the speckle material sample is arranged on the loading mechanism, the vacuum chamber is vacuumized and purged by ultra-high purity argon before heating, so that the oxygen content is reduced, and the surface of the sample is protected from oxidation.
Further, in one embodiment, the stretching in situ observation step further comprises: the marking area of the material sample is tracked in real time when the laser scanning confocal microscope shoots, the marking area is always positioned in the center of a visual field in the whole stretching process, the observation video is stored in real time, pictures at corresponding moments are stored according to set time intervals, and meanwhile, the stretching curve is recorded in real time.
Further, in a preferred embodiment, the deformation strain evolution analysis step includes:
an image screening step, namely screening the surface photos of the material in the in-situ stretching process obtained by an ultrahigh-temperature laser scanning confocal microscope, and selecting effective speckle images with gray distribution meeting the set requirements;
A strain analysis step, namely calculating the screened effective speckle images by adopting a DIC algorithm to realize the matching of deformation points on the surface of the object, and reconstructing coordinates of calculation points on the surface of the object according to parallax data of all corresponding points; and the displacement field of the object surface is obtained by comparing the coordinate changes of each point in each deformation state measuring area, and then the strain field of the object surface is obtained by calculating with GOM software and VIC-2D software.
For the foregoing method embodiments, for simplicity of explanation, the methodologies are shown as a series of acts, but one of ordinary skill in the art will appreciate that the present invention is not limited by the order of acts, as some steps may, in accordance with the present invention, occur in other orders or concurrently. Further, those skilled in the art will also appreciate that the embodiments described in the specification are all preferred embodiments, and that the acts and modules referred to are not necessarily required for the present invention.
It should be noted that in other embodiments of the present invention, the method may further obtain a new dynamic evolution analysis method of the strain of the ultra-high temperature deformed microstructure of the material by combining one or more of the above embodiments, so as to implement comprehensive analysis of the failure study of the material.
It should be noted that, based on the method in any one or more of the foregoing embodiments of the present invention, the present invention further provides a storage medium, where a program code capable of implementing the method in any one or more of the foregoing embodiments is stored, where the code is executed by an operating system, and the method is capable of implementing an analysis method for dynamic evolution of strain of a material ultra-high temperature deformation microstructure as described above.
It is to be understood that the disclosed embodiments are not limited to the specific structures, process steps, or materials disclosed herein, but are intended to extend to equivalents of these features as would be understood by one of ordinary skill in the relevant arts. It is also to be understood that the terminology used herein is for the purpose of describing particular embodiments only, and is not intended to be limiting.
Reference in the specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the invention. Thus, the appearances of the phrase "one embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment.
Although the embodiments of the present invention are described above, the embodiments are only used for facilitating understanding of the present invention, and are not intended to limit the present invention. Any person skilled in the art can make any modification and variation in form and detail without departing from the spirit and scope of the present disclosure, but the scope of the present disclosure is still subject to the scope of the appended claims.
Claims (10)
1. An analysis system for dynamic evolution of strain in a material ultra-high temperature deformed microstructure, the system comprising:
the sample preparation mechanism is configured to cut a sheet-shaped material to be tested, and pretreat the sheet-shaped material to obtain an effective material sample according to the test requirement so as to put into test and realize the ultrahigh temperature deformation test of the material;
a test speckle forming mechanism configured to produce high-contrast random speckle for the obtained material sample, to obtain a speckle material sample; the speckles are speckles particles with the size of submicron or nanometer level and stable performance;
the in-situ stretching and observing mechanism is configured to perform in-situ stretching and testing on the speckle material sample based on a set displacement rate by utilizing a high-temperature stretching and compressing system in an environment cavity of the high-temperature heating furnace, and a laser scanning confocal microscope is adopted to observe and store videos and dynamic images of the sample in real time in the testing process;
the deformation strain evolution analysis module is connected with the in-situ stretching observation mechanism and is configured to analyze dynamic images of the testing process based on a DIC algorithm, construct a displacement field of the surface of the speckle material sample and calculate a corresponding strain field.
2. The system of claim 1, wherein the sample preparation mechanism comprises a material cutting module and a material processing module;
The material cutting module is used for cutting sheet materials with set sizes from the plates in a linear cutting mode according to the experimental requirements of ultrahigh-temperature in-situ observation;
the material processing module is configured to grind two sides of the cut sheet material by using a sand paper grinding device, one side is selected as an observation surface, and the sheet material is ground step by using a metallographic sand paper device until the observation requirement is met; and then marking the observation area on the observation surface by using a marking device, wherein the marking device is a microhardness meter.
3. The system of claim 1, wherein the trial speckle-forming mechanism comprises:
the primer spraying module is configured to uniformly spray a matte high-temperature primer with set thickness on an observation surface of a material test when the surface of a material sample is ensured to be clean and no dirt is attached;
a speckle spray module configured to further spray a dispersed and randomly distributed high contrast high temperature paint over the high temperature primer.
4. The system of claim 1, wherein the test speckle forming mechanism further comprises
And the speckle sample baking module adopts a muffle furnace and is used for baking the material sample sprayed with the speckle at a constant temperature according to a set temperature and a set time length so as to ensure that the speckle has high-temperature stability.
5. The system of claim 1, wherein the in-situ stretch viewing mechanism comprises a stretch compression table disposed within an environmental chamber of a high temperature furnace and two loading mechanisms;
the loading mechanism is used for installing a speckle material sample, the first loading mechanism is fixed on the stretching and compressing workbench, and the other loading mechanism is connected with a linear driver of the high-temperature stretching and compressing system.
6. The system of claim 1, wherein the in-situ tensile observation mechanism uses a violet laser VL2000DX with a wavelength of 408nm and a scanning speed of 15 to 120 frames per second.
7. The system of claim 1, wherein the in situ stretch viewing mechanism further comprises a test pre-treatment module configured to evacuate the vacuum chamber and purge with ultra-high purity argon to reduce oxygen content after mounting the sample of speckle material on the loading mechanism and prior to heating, to protect the sample surface from oxidation.
8. The system of claim 1, wherein the laser scanning confocal microscope captures a marked area of the material sample in real time, the marked area is always positioned in the center of the field of view during the whole stretching process, the observation video is stored in real time, pictures at corresponding moments are stored at set time intervals, and the stretching curve of the test is recorded in real time.
9. The system of claim 1, wherein the deformation strain evolution analysis module comprises an image screening unit and a strain analysis unit;
the image screening unit is configured to screen the surface photos of the material in the in-situ stretching process obtained by the ultra-high temperature laser scanning confocal microscope, and select effective speckle images with gray distribution meeting the set requirements;
the strain analysis unit is configured to calculate the screened effective speckle images by using a DIC algorithm, so as to realize the matching of deformation points on the surface of the object, and reconstruct coordinates of calculation points on the surface of the object according to parallax data of all corresponding points; and the displacement field of the object surface is obtained by comparing the coordinate changes of each point in each deformation state measuring area, and then the strain field of the object surface is obtained by calculating with GOM software and VIC-2D software.
10. An analysis method for dynamic evolution of strain of ultrahigh-temperature deformed microstructure of a material is characterized by comprising the following steps:
the preparation method comprises the steps of sample preparation, preprocessing a sheet-shaped material to be tested according to test requirements after cutting the material to be tested to obtain an effective material sample, and putting the material sample into a test to realize a material ultra-high temperature deformation test;
a test speckle forming step of preparing high-contrast random speckle for the obtained material sample to obtain a speckle material sample; the speckles are speckles particles with the size of submicron or nanometer level and stable performance;
In-situ stretching observation, namely in-situ stretching test is carried out on the speckle material sample by utilizing a high-temperature stretching compression system based on a set displacement rate in an environment cavity of a high-temperature heating furnace, and a laser scanning confocal microscope is adopted to observe and store videos and dynamic images of the sample in real time in the test process;
and a deformation strain evolution analysis step, which is configured to analyze dynamic images of the testing process based on a DIC algorithm, construct a displacement field of the surface of the speckle material sample and calculate a corresponding strain field.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210269097.0A CN116793776A (en) | 2022-03-18 | 2022-03-18 | Analysis system and method for dynamic evolution of strain of ultrahigh-temperature deformed microstructure of material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210269097.0A CN116793776A (en) | 2022-03-18 | 2022-03-18 | Analysis system and method for dynamic evolution of strain of ultrahigh-temperature deformed microstructure of material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116793776A true CN116793776A (en) | 2023-09-22 |
Family
ID=88035141
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210269097.0A Pending CN116793776A (en) | 2022-03-18 | 2022-03-18 | Analysis system and method for dynamic evolution of strain of ultrahigh-temperature deformed microstructure of material |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116793776A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117110346A (en) * | 2023-10-23 | 2023-11-24 | 中国空气动力研究与发展中心设备设计与测试技术研究所 | Analysis method for microstructure of laser selective melting plate |
| CN117892593A (en) * | 2024-01-18 | 2024-04-16 | 华中科技大学 | In-situ EBSD-DIC simulation method and system |
| CN118070407A (en) * | 2024-04-22 | 2024-05-24 | 江苏省建筑工程质量检测中心有限公司 | Image processing-based fireproof air duct fire resistance limit simulation and optimization design method |
| CN118565975A (en) * | 2024-07-30 | 2024-08-30 | 深圳大学 | Method and system for testing performance of concrete material in high-temperature environment |
-
2022
- 2022-03-18 CN CN202210269097.0A patent/CN116793776A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117110346A (en) * | 2023-10-23 | 2023-11-24 | 中国空气动力研究与发展中心设备设计与测试技术研究所 | Analysis method for microstructure of laser selective melting plate |
| CN117892593A (en) * | 2024-01-18 | 2024-04-16 | 华中科技大学 | In-situ EBSD-DIC simulation method and system |
| CN118070407A (en) * | 2024-04-22 | 2024-05-24 | 江苏省建筑工程质量检测中心有限公司 | Image processing-based fireproof air duct fire resistance limit simulation and optimization design method |
| CN118565975A (en) * | 2024-07-30 | 2024-08-30 | 深圳大学 | Method and system for testing performance of concrete material in high-temperature environment |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN116793776A (en) | Analysis system and method for dynamic evolution of strain of ultrahigh-temperature deformed microstructure of material | |
| Franck et al. | Three-dimensional full-field measurements of large deformations in soft materials using confocal microscopy and digital volume correlation | |
| KR101004473B1 (en) | Surface-distortion measuring device and method | |
| US7317964B1 (en) | High speed and repeatability serial sectioning method for 3-D reconstruction of microstructures | |
| LePage et al. | Cross polarization for improved digital image correlation | |
| De Matos et al. | Experimental and numerical investigation of thickness effects in plasticity-induced fatigue crack closure | |
| JP6594294B2 (en) | Image quality evaluation of microscopic images | |
| CN104075954B (en) | Hardness-testing device and hardness measuring method | |
| Guery et al. | Characterization of SEM speckle pattern marking and imaging distortion by digital image correlation | |
| CN112255113B (en) | High-temperature elastic constant measuring method for thin strip | |
| Sola et al. | Predicting crack initiation site in polycrystalline nickel through surface topography changes | |
| JPH0245734A (en) | Automatic structure analytic processor | |
| JP4957291B2 (en) | Apparatus and method for measuring surface distortion | |
| Nguyen et al. | Experimental multiscale measurements for the mechanical identification of a cortical bone by digital image correlation | |
| JP2001141434A (en) | Contact state observing method and device | |
| CN112485280A (en) | Speckle preparation method for high-resolution local strain analysis of metal material | |
| CN110487831B (en) | Preparation method of speckles and method and equipment for preparing gold nanoparticle coating speckles | |
| JP5481883B2 (en) | Sample analyzer using specific site detection method | |
| CN114608949A (en) | Method for testing mechanical property of rare earth magnesium alloy after corrosion and application thereof | |
| CN109283066A (en) | A kind of Fine Texture of Material bending compression performance dynamic high pass measuring device | |
| Xie et al. | In situ scanning–digital image correlation for high-temperature deformation measurement of nickel-based single crystal superalloy | |
| CN115901453A (en) | Tensile cracking failure test method and system for layered composite material | |
| Yang et al. | Optimized optical setup for DIC in rock mechanics | |
| Kareiva et al. | Scanning electron microscopy: extrapolation of 3D data from SEM micrographs | |
| Wanni et al. | High‐resolution optical microscopy for characterising microstructural deformation in microtensile testing |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |