CN114739845A - Method and device for detecting mechanical properties of metal welding seam and heat affected zone - Google Patents
Method and device for detecting mechanical properties of metal welding seam and heat affected zone Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 40
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- 238000002474 experimental method Methods 0.000 claims abstract description 24
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/40—Investigating hardness or rebound hardness
- G01N3/42—Investigating hardness or rebound hardness by performing impressions under a steady load by indentors, e.g. sphere, pyramid
- G01N3/44—Investigating hardness or rebound hardness by performing impressions under a steady load by indentors, e.g. sphere, pyramid the indentors being put under a minor load and a subsequent major load, i.e. Rockwell system
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0001—Type of application of the stress
- G01N2203/0003—Steady
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0019—Compressive
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0075—Strain-stress relations or elastic constants
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/0076—Hardness, compressibility or resistance to crushing
- G01N2203/0078—Hardness, compressibility or resistance to crushing using indentation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/026—Specifications of the specimen
- G01N2203/0296—Welds
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0676—Force, weight, load, energy, speed or acceleration
Abstract
The invention discloses a method and a device for detecting mechanical properties of a metal welding seam and a heat affected zone, and relates to the technical field of metal mechanical property detection. According to the invention, after the metal welding seam and the heat affected zone sample are cut, a nano indentation experiment is carried out on the sample to obtain a load-indentation depth curve corresponding to each indentation point on the sample, and the material elastic modulus, the material hardening index, the material yield strength and the stress-strain curve corresponding to each indentation point are determined according to the load-indentation depth curve, so that the detection of the mechanical properties of the metal welding seam and the heat affected zone is realized, two welded base materials are not required to be the same, the sample is not required to be cut for tensile test, and a large amount of iterative calculation and manual parameter adjustment when the material properties are predicted by adopting finite element simulation approximation are avoided.
Description
Technical Field
The invention relates to the technical field of metal mechanical property detection, in particular to a method and a device for detecting the mechanical property of a metal welding seam and a heat affected zone.
Background
In the metal welding process, due to the influence of input heat energy, the mechanical properties of a welding seam and the mechanical properties near the welding seam are different from those of a base material, and accordingly the welding seam and the nearby area can be divided into the base material, a heat affected zone and a welding seam area. In addition, if the properties of the connected base materials are different, the regions become the forms of the first base material, the first heat-affected zone, the weld, the second heat-affected zone, and the second base material. In addition, the mechanical properties of the first heat-affected zone to the second heat-affected zone are greatly different and uneven. Because the welding seam area is small and the mechanical properties are not uniform, the mechanical properties of the welding seam and the heat affected zone, such as elastic modulus, yield strength, hardening index, stress-strain curve and the like, cannot be obtained by sampling and performing a tensile experiment, so that the material properties of the welding seam and the heat affected zone cannot be accurately defined in numerical simulation, and only can be simply defined as rigid connection with a base metal, so that the reduction of simulation precision is caused; if the performance difference of the connected parent metal is large, the simple processing method further reduces the simulation precision. Therefore, a method for acquiring the mechanical properties of the weld and the heat affected zone is needed to improve the numerical simulation accuracy.
Disclosure of Invention
The invention provides a method and a device for detecting the mechanical properties of a metal welding seam and a heat affected zone, and solves the technical problem of how to detect the mechanical properties of the metal welding seam and the heat affected zone.
On one hand, the embodiment of the invention provides the following technical scheme:
a method for detecting mechanical properties of a metal welding seam and a heat affected zone comprises the following steps:
after a metal welding seam and a heat affected zone sample are cut, performing a nano indentation experiment on the sample to obtain a load-indentation depth curve corresponding to each indentation point on the sample;
and determining the material elastic modulus, the material hardening index, the material yield strength and the stress-strain curve corresponding to each indentation point according to the load-indentation depth curve.
Preferably, after the metal weld and the heat affected zone sample are cut, a nano indentation experiment is performed on the sample, and a load-indentation depth curve corresponding to each indentation point on the sample is obtained, including:
after the sample is cut, sequentially carrying out grinding polishing and electrolytic polishing treatment on the surface of the sample;
and carrying out a nano indentation experiment on the sample to obtain the load-indentation depth curve corresponding to each indentation point.
Preferably, the determining of the material elastic modulus, the material hardening index, the material yield strength and the stress-strain curve corresponding to each indentation point according to the load-indentation depth curve comprises:
determining the material hardening index, the material elastic modulus and the material yield strength corresponding to each indentation point according to the load-indentation depth curve;
determining the stress-strain curve corresponding to each of the indentation points according to the material hardening index, the material elastic modulus, and the material yield strength.
Preferably, the determining the material hardening index, the material elastic modulus and the material yield strength corresponding to each indentation point according to the load-indentation depth curve comprises:
acquiring a loading curvature, an initial unloading slope, a residual indentation depth after unloading, a maximum indentation depth in a loading process and a load corresponding to the maximum indentation depth according to the load-indentation depth curve;
determining a reduced elastic modulus according to the initial unloading slope, the residual indentation depth, the maximum indentation depth and the load corresponding to the maximum indentation depth;
determining the elastic modulus of the material according to the reduced elastic modulus;
determining a representative stress at the time of representative strain according to the loading curvature and the reduced elastic modulus;
determining the material hardening index from the initial unload slope, the maximum indentation depth, the reduced modulus of elasticity, and the representative stress;
determining the material yield strength from the material elastic modulus, the representative stress, and the material hardening index.
Preferably, the determining the stress-strain curve corresponding to each indentation point according to the material hardening index, the material elastic modulus and the material yield strength comprises:
σ is the stress, E is the elastic modulus of the material, ε is the total effective strain, σyIs the yield strength of the material, R is the strength coefficient, n is the hardening index of the material, epsilonpIs the effective plastic strain.
On the other hand, the embodiment of the invention also provides the following technical scheme:
a mechanical property detection device for a metal welding seam and a heat affected zone comprises:
the load-indentation depth curve acquisition module is used for carrying out a nano indentation experiment on a sample after cutting the metal welding seam and a heat affected zone sample to acquire a load-indentation depth curve corresponding to each indentation point on the sample; and the stress-strain curve determining module is used for determining the material elastic modulus, the material hardening index, the material yield strength and the stress-strain curve corresponding to each indentation point according to the load-indentation depth curve.
Preferably, the stress-strain curve determining module is further configured to:
determining the material hardening index, the material elastic modulus and the material yield strength corresponding to each indentation point according to the load-indentation depth curve;
determining the stress-strain curve corresponding to each indentation point according to the material hardening index, the material elastic modulus and the material yield strength.
Preferably, the stress-strain curve determining module is further configured to:
acquiring a loading curvature, an initial unloading slope, a residual indentation depth after unloading, a maximum indentation depth in a loading process and a load corresponding to the maximum indentation depth according to the load-indentation depth curve;
determining a reduced elastic modulus according to the initial unloading slope, the residual indentation depth, the maximum indentation depth and the load corresponding to the maximum indentation depth;
determining the elastic modulus of the material according to the reduced elastic modulus;
determining a representative stress at the time of representative strain according to the loading curvature and the reduced elastic modulus;
determining the material hardening index from the initial unload slope, the maximum indentation depth, the reduced modulus of elasticity, and the representative stress;
determining the material yield strength from the material modulus of elasticity, the representative stress, and the material hardening index.
On the other hand, the embodiment of the invention also provides the following technical scheme:
an electronic device comprises a memory, a processor and a computer program stored on the memory and capable of running on the processor, wherein the processor executes the program to realize any one of the methods for detecting the mechanical property of the metal welding seam and the heat affected zone.
On the other hand, the embodiment of the invention also provides the following technical scheme:
a computer-readable storage medium, on which a computer program is stored, which, when executed by a processor, implements any one of the above methods for mechanical property detection of a metal weld and a heat-affected zone.
One or more technical schemes provided by the invention at least have the following technical effects or advantages:
according to the invention, after the metal welding seam and the heat affected zone sample are cut, a nano indentation experiment is carried out on the sample to obtain a load-indentation depth curve corresponding to each indentation point on the sample, and the material elastic modulus, the material hardening index, the material yield strength and the stress-strain curve corresponding to each indentation point are determined according to the load-indentation depth curve, so that the detection of the mechanical properties of the metal welding seam and the heat affected zone is realized, two welded base materials are not required to be the same, the sample is not required to be cut for tensile test, and a large amount of iterative calculation and manual parameter adjustment when the material properties are predicted by adopting finite element simulation approximation are avoided.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a flowchart of a method for detecting mechanical properties of a metal weld and a heat affected zone according to an embodiment of the present invention;
FIG. 2 is a schematic illustration of a load-indentation depth curve in an embodiment of the invention;
fig. 3 is a schematic structural diagram of a mechanical property detection device for a metal weld joint and a heat affected zone in an embodiment of the invention.
Detailed Description
The embodiment of the invention provides a method and a device for detecting the mechanical properties of a metal welding seam and a heat affected zone, and solves the technical problem of how to detect the mechanical properties of the metal welding seam and the heat affected zone.
In order to better understand the technical scheme of the invention, the technical scheme of the invention is described in detail in the following with the accompanying drawings and specific embodiments.
First, it is stated that the term "and/or" appearing herein is merely one type of associative relationship that describes an associated object, meaning that three types of relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
As shown in fig. 1, the method for detecting mechanical properties of a metal weld and a heat affected zone in this embodiment includes:
step S1, after cutting a metal welding seam and a heat affected zone sample, carrying out a nano indentation experiment on the sample to obtain a load-indentation depth curve corresponding to each indentation point on the sample;
and step S2, determining the material elastic modulus, the material hardening index, the material yield strength and the stress-strain curve corresponding to each indentation point according to the load-indentation depth curve.
Step S1 specifically includes: after a sample is cut, sequentially carrying out grinding polishing and electrolytic polishing treatment on the surface of the sample; and carrying out a nano indentation experiment on the sample to obtain a load-indentation depth curve corresponding to each indentation point.
In step S1, the surface of the sample is subjected to a grinding and polishing process for the purpose of removing foreign matter such as scale and preparing for electrolytic polishing; the purpose of the electrolytic polishing treatment is to enable the surface of a sample to be flat and smooth, facilitate the detection of microstructures and ensure that a pressure head is not influenced by other factors when being pressed down in a nano indentation experiment.
In step S1, the procedure of performing the nanoindentation experiment on the sample is as follows: and determining the initial position and the final position of the indentation points on the sample and the distance between the indentation points, so that the number of the indentation points is also determined, and carrying out nano indentation experiments on each indentation point in sequence from the initial position to the final position of the indentation point. The interval between the indentation points can not be too small to avoid the mutual influence between the two indentation points, and can not be too large to ignore the mechanical property of the area with violent mechanical property transformation, and the interval is as small as possible in principle.
The nano indentation experiment process can be divided into 2 loading stages and 2 unloading stages, in the loading stage, when the load applied to the surface of a sample by a test pressure head is small enough, the sample material firstly generates elastic deformation, along with the increase of the applied load, the area with the largest elastic deformation generates plastic deformation, and when the load is large enough, the pressed area enters a complete plastic stage; during the unloading phase, as the indenter is withdrawn, the material in the indentation zone of the previous indenter is elastically restored, while the residual indentation due to the plastic deformation remains.
In step S1, the load-indentation depth curve is shown in fig. 2, the load-indentation depth curve includes a load-indentation depth curve at the loading stage and a load-indentation depth curve at the unloading stage,load-indentation depth profile of the loading phase, e.g. p ═ Ch2And C is the loading curvature.
Step S2 specifically includes: determining the material hardening index, the material elastic modulus and the material yield strength corresponding to each indentation point according to the load-indentation depth curve; and determining a stress-strain curve corresponding to each indentation point according to the material hardening index, the material elastic modulus and the material yield strength.
In step S2, determining the material hardening index, the material elastic modulus and the material yield strength corresponding to each indentation point according to the load-indentation depth curve, including: acquiring a loading curvature, an initial unloading slope, a residual indentation depth after unloading, a maximum indentation depth in a loading process and a load corresponding to the maximum indentation depth according to a load-indentation depth curve; determining a reduced elastic modulus according to the initial unloading slope, the residual indentation depth, the maximum indentation depth and the load corresponding to the maximum indentation depth; determining the elastic modulus of the material according to the reduced elastic modulus; determining a representative stress at the time of representative strain according to the loading curvature and the reduced elastic modulus; determining a material hardening index according to the initial unloading slope, the maximum indentation depth, the reduced elastic modulus and the representative stress; the material yield strength is determined according to the elastic modulus, the representative stress and the material hardening index of the material.
Wherein, the load-indentation depth curve can be fitted to obtain the loading curvature.
Determining a reduced elastic modulus according to the initial unloading slope, the residual indentation depth, the maximum indentation depth and the load corresponding to the maximum indentation depth, wherein the determining comprises the following steps:
Wherein, according to the loading curvature and the reduced elastic modulus, determining the representative stress when the representative strain is generated, comprises the following steps:
Wherein, according to the initial unloading slope, the maximum indentation depth, the reduced elastic modulus and the representative stress, determining a material hardening index, comprising:
Wherein, the determining of the elastic modulus of the material according to the reduced elastic modulus comprises:
In step S2, determining a stress-strain curve corresponding to each indentation point according to the material hardening index, the material elastic modulus, and the material yield strength, including:
σ is the stress, ε is the total effective strain, σyIs the yield strength of the material, R is the strength coefficient, n is the hardening index of the material, epsilonpFor effective plastic strain, ε includes yield strain and εpTwo parts. It can be seen that the stress-strain curve is divided into two segments and the material yield strength is the boundary between elastic deformation and plastic deformation. The stress-strain curve is used as input data for material performance in numerical simulation.
As can be seen from the above, in this embodiment, after the metal weld and the heat affected zone sample are cut, the nano indentation experiment is performed on the sample, a load-indentation depth curve corresponding to each indentation point on the sample is obtained, and the stress-strain curve corresponding to each indentation point is determined according to the load-indentation depth curve, so that the detection of the mechanical properties of the metal weld and the heat affected zone is realized.
In addition, a stress-strain curve can be obtained by performing a tensile experiment on a base material generally, and the stress-strain curve is input into finite element software as the stress-strain curve of a welding seam area, then the load-indentation depth curve is obtained by a finite element simulated indentation experiment and compared with an actual indentation experiment, and the approximate static mechanical property of a certain part of the welding seam can be obtained after multiple simulated iterations; in addition, if there is a significant difference in mechanical properties between the two metals to be joined, it is not desirable to use the stress-strain curve of the base metal instead of the stress-strain curve of the weld for the initial input. Generally, a tensile sample can be selected at a welding seam for tensile test, and simultaneously, the hardness is measured for regression analysis or data fitting analysis, so that the relation between the yield strength, the tensile strength and the hardness is obtained, and the mechanical property of the welding seam is predicted. Compared with the two methods, the method does not need to weld the same two base material materials, does not need to cut a sample for tensile test, and avoids a large amount of iterative calculation and manual parameter adjustment when the finite element simulation is adopted to approximate and predict the material performance.
As shown in fig. 3, the present embodiment further provides a device for detecting mechanical properties of a metal weld and a heat affected zone, including:
the load-indentation depth curve acquisition module is used for carrying out a nano indentation experiment on a sample after cutting out a metal welding seam and a heat affected zone sample, and acquiring a load-indentation depth curve corresponding to each indentation point on the sample;
and the stress-strain curve determining module is used for determining the material elastic modulus, the material hardening index, the material yield strength and the stress-strain curve corresponding to each indentation point according to the load-indentation depth curve.
Wherein the stress-strain curve determination module is further configured to: determining the material hardening index, the material elastic modulus and the material yield strength corresponding to each indentation point according to the load-indentation depth curve; and determining a stress-strain curve corresponding to each indentation point according to the material hardening index, the material elastic modulus and the material yield strength. A stress-strain curve determination module further configured to: acquiring a loading curvature, an initial unloading slope, a residual indentation depth after unloading, a maximum indentation depth in a loading process and a load corresponding to the maximum indentation depth according to a load-indentation depth curve; determining a reduced elastic modulus according to the initial unloading slope, the residual indentation depth, the maximum indentation depth and the load corresponding to the maximum indentation depth; determining the elastic modulus of the material according to the reduced elastic modulus; determining a representative stress at the time of representative strain according to the loading curvature and the reduced elastic modulus; determining a material hardening index according to the initial unloading slope, the maximum indentation depth, the reduced elastic modulus and the representative stress; the material yield strength is determined according to the elastic modulus, the representative stress and the material hardening index of the material.
After the metal welding seam and the heat affected zone sample are cut, the device for detecting the mechanical properties of the metal welding seam and the heat affected zone performs a nano indentation experiment on the sample to obtain a load-indentation depth curve corresponding to each indentation point on the sample, and determines a stress-strain curve corresponding to each indentation point according to the load-indentation depth curve, so that the detection of the mechanical properties of the metal welding seam and the heat affected zone is realized, two base metal materials which do not need to be welded are the same, the sample does not need to be cut for tensile test, and a large amount of iterative calculation and manual parameter adjustment when the material properties are predicted by adopting finite element simulation approximation are avoided.
Based on the same inventive concept as the method for detecting the mechanical properties of the metal weld joint and the heat affected zone, the present embodiment further provides an electronic device, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of any one of the methods for detecting the mechanical properties of the metal weld joint and the heat affected zone when executing the program.
Where a bus architecture (represented by a bus) is used, the bus may comprise any number of interconnected buses and bridges that link together various circuits including one or more processors, represented by a processor, and memory, represented by a memory. The bus may also link various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. A bus interface provides an interface between the bus and the receiver and transmitter. The receiver and transmitter may be the same element, i.e., a transceiver, providing a means for communicating with various other apparatus over a transmission medium. The processor is responsible for managing the bus and general processing, while the memory may be used for storing data used by the processor in performing operations.
Since the electronic device described in this embodiment is an electronic device used for implementing the method for detecting mechanical properties of the metal weld and the heat affected zone in the embodiment of the present invention, based on the method for detecting mechanical properties of the metal weld and the heat affected zone described in the embodiment of the present invention, a person skilled in the art can understand the specific implementation manner of the electronic device of this embodiment and various variations thereof, and therefore, how to implement the method in the embodiment of the present invention by the electronic device is not described in detail herein. As long as those skilled in the art implement the electronic device used in the method for detecting mechanical properties of a metal weld joint and a heat affected zone in the embodiment of the present invention, the electronic device is within the scope of the present invention.
Based on the same inventive concept as the method for detecting the mechanical properties of the metal welding seam and the heat affected zone, the invention further provides a computer readable storage medium, wherein a computer program is stored on the computer readable storage medium, and when the computer program is executed by a processor, the method for detecting the mechanical properties of any one of the metal welding seam and the heat affected zone is realized.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A method for detecting mechanical properties of a metal welding seam and a heat affected zone is characterized by comprising the following steps:
after cutting a metal welding seam and a heat affected zone sample, carrying out a nano indentation experiment on the sample to obtain a load-indentation depth curve corresponding to each indentation point on the sample;
and determining the material elastic modulus, the material hardening index, the material yield strength and the stress-strain curve corresponding to each indentation point according to the load-indentation depth curve.
2. The method for detecting mechanical properties of a metal welding seam and a heat affected zone as claimed in claim 1, wherein the step of performing a nano indentation experiment on a sample after cutting the metal welding seam and the heat affected zone sample to obtain a load-indentation depth curve corresponding to each indentation point on the sample comprises:
after the sample is cut, sequentially carrying out grinding polishing and electrolytic polishing treatment on the surface of the sample;
and carrying out a nano indentation experiment on the sample to obtain the load-indentation depth curve corresponding to each indentation point.
3. The method for detecting the mechanical properties of the metal welding seam and the heat affected zone as claimed in claim 1, wherein the determining of the material elastic modulus, the material hardening index, the material yield strength and the stress-strain curve corresponding to each indentation point according to the load-indentation depth curve comprises:
determining the material hardening index, the material elastic modulus and the material yield strength corresponding to each indentation point according to the load-indentation depth curve;
determining the stress-strain curve corresponding to each indentation point according to the material hardening index, the material elastic modulus and the material yield strength.
4. The method for detecting the mechanical properties of the metal welding seam and the heat affected zone as claimed in claim 3, wherein the determining the material hardening index, the material elastic modulus and the material yield strength corresponding to each indentation point according to the load-indentation depth curve comprises:
acquiring a loading curvature, an initial unloading slope, a residual indentation depth after unloading, a maximum indentation depth in a loading process and a load corresponding to the maximum indentation depth according to the load-indentation depth curve;
determining a reduced elastic modulus according to the initial unloading slope, the residual indentation depth, the maximum indentation depth and the load corresponding to the maximum indentation depth;
determining the elastic modulus of the material according to the reduced elastic modulus;
determining a representative stress at the time of representative strain according to the loading curvature and the reduced elastic modulus;
determining the material hardening index from the initial unload slope, the maximum indentation depth, the reduced modulus of elasticity, and the representative stress;
determining the material yield strength from the material elastic modulus, the representative stress, and the material hardening index.
5. The method for detecting mechanical properties of a metal welding seam and a heat affected zone as claimed in claim 3, wherein the determining the stress-strain curve corresponding to each indentation point according to the material hardening index, the material elastic modulus and the material yield strength comprises:
σ is the stress, E is the elastic modulus of the material, ε is the total effective strain, σyIs the yield strength of the material, R is the strength coefficient, n is the hardening index of the material, epsilonpIs the effective plastic strain.
6. The utility model provides a mechanical properties detection device of metal welding seam and heat affected zone which characterized in that includes:
the load-indentation depth curve acquisition module is used for carrying out nano indentation experiments on a sample after a metal welding seam and a heat affected zone sample are cut, and acquiring a load-indentation depth curve corresponding to each indentation point on the sample;
and the stress-strain curve determining module is used for determining the material elastic modulus, the material hardening index, the material yield strength and the stress-strain curve corresponding to each indentation point according to the load-indentation depth curve.
7. The apparatus for testing mechanical properties of a metal weld and a heat affected zone of claim 6, wherein the stress-strain curve determining module is further configured to:
determining the material hardening index, the material elastic modulus and the material yield strength corresponding to each indentation point according to the load-indentation depth curve;
determining the stress-strain curve corresponding to each of the indentation points according to the material hardening index, the material elastic modulus, and the material yield strength.
8. The apparatus for testing mechanical properties of a metal weld and a heat affected zone of claim 7, wherein the stress-strain curve determining module is further configured to:
acquiring a loading curvature, an initial unloading slope, a residual indentation depth after unloading, a maximum indentation depth in a loading process and a load corresponding to the maximum indentation depth according to the load-indentation depth curve;
determining a reduced elastic modulus according to the initial unloading slope, the residual indentation depth, the maximum indentation depth and the load corresponding to the maximum indentation depth;
determining the elastic modulus of the material according to the reduced elastic modulus;
determining a representative stress at the time of representative strain according to the loading curvature and the reduced elastic modulus;
determining the material hardening index from the initial unload slope, the maximum indentation depth, the reduced modulus of elasticity, and the representative stress;
determining the material yield strength from the material modulus of elasticity, the representative stress, and the material hardening index.
9. An electronic device, comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor executes the program to implement the method for detecting mechanical properties of a metal weld and a heat affected zone according to any one of claims 1 to 5.
10. A computer-readable storage medium, characterized in that the computer-readable storage medium has stored thereon a computer program, which when executed by a processor, implements the method for detecting mechanical properties of a metal weld and a heat-affected zone according to any one of claims 1 to 5.
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