CN113295327A - Zero-stress sample for ultrasonic stress measurement method and preparation method thereof - Google Patents
Zero-stress sample for ultrasonic stress measurement method and preparation method thereof Download PDFInfo
- Publication number
- CN113295327A CN113295327A CN202010108643.3A CN202010108643A CN113295327A CN 113295327 A CN113295327 A CN 113295327A CN 202010108643 A CN202010108643 A CN 202010108643A CN 113295327 A CN113295327 A CN 113295327A
- Authority
- CN
- China
- Prior art keywords
- stress
- sample
- zero
- rolling direction
- cutting
- 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.)
- Granted
Links
- 238000000691 measurement method Methods 0.000 title claims abstract description 15
- 238000002360 preparation method Methods 0.000 title abstract description 18
- 239000000463 material Substances 0.000 claims abstract description 76
- 238000005520 cutting process Methods 0.000 claims abstract description 73
- 238000000034 method Methods 0.000 claims abstract description 59
- 238000005259 measurement Methods 0.000 claims abstract description 46
- 238000000137 annealing Methods 0.000 claims abstract description 24
- 238000012360 testing method Methods 0.000 claims abstract description 16
- 238000005096 rolling process Methods 0.000 claims description 48
- 238000001514 detection method Methods 0.000 claims description 36
- 238000012545 processing Methods 0.000 claims description 13
- 239000013072 incoming material Substances 0.000 claims description 9
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 238000005516 engineering process Methods 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 abstract description 9
- 239000010959 steel Substances 0.000 abstract description 9
- 238000007789 sealing Methods 0.000 abstract description 3
- 238000010438 heat treatment Methods 0.000 description 9
- 238000005070 sampling Methods 0.000 description 9
- 239000002994 raw material Substances 0.000 description 6
- 238000004080 punching Methods 0.000 description 5
- 238000001816 cooling Methods 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 238000004321 preservation Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- 238000005464 sample preparation method Methods 0.000 description 2
- 238000009662 stress testing Methods 0.000 description 2
- 238000002441 X-ray diffraction Methods 0.000 description 1
- 239000010953 base metal Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L25/00—Testing or calibrating of apparatus for measuring force, torque, work, mechanical power, or mechanical efficiency
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/22—Details, e.g. general constructional or apparatus details
- G01N29/30—Arrangements for calibrating or comparing, e.g. with standard objects
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
- G01N2001/2873—Cutting or cleaving
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N2001/2893—Preparing calibration standards
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/028—Material parameters
- G01N2291/02827—Elastic parameters, strength or force
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Sampling And Sample Adjustment (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention discloses a zero-stress sample for an ultrasonic stress measurement method and a preparation method thereof, and the method mainly comprises the following steps: (1) selecting and preparing the supplied materials for zero-stress sample calibration; (2) preparing a sample and marking; (3) detecting zero stress for the first time; (4) determining a stress relief annealing process of a zero-stress sample; (5) stress relief annealing treatment of the sample; (6) detecting zero stress for the second time; (7) the wire cutting further releases the stress; (8) detecting zero stress for the third time; (9) and (6) carrying out cross sample sealing and storing. The invention provides a new technical means for the preparation and calibration of the zero stress sample, can solve the problem that the high-accuracy zero stress sample is difficult to process and evaluate in the ultrasonic method stress measurement caused by the uneven residual stress level of the in-service steel pipe and the plate, can provide the zero stress sample represented in a higher precision and a wider range for the ultrasonic method stress measurement of the high-steel-grade pipeline steel, and has important significance for standardizing the preparation of the ultrasonic zero stress sample and improving the residual stress test precision of the pipeline steel.
Description
Technical Field
The invention relates to the technical field of residual stress measurement, in particular to a zero-stress sample for an ultrasonic stress measurement method and a preparation method thereof.
Background
The residual stress is one of the main factors for controlling the quality of the pipe, is one of the factors causing the defect expansion failure of the in-service pipeline, is one of the important parameters for evaluating the defect applicability, and has important significance for nondestructively measuring the residual stress in the structure of the in-service pipeline and the plate. The methods for measuring the residual stress are many, but the methods applied at present have great limitations, such as the pinhole method is accurate but causes damage to the workpiece, and the X-ray diffraction method has too low measurement depth. The traditional residual stress measuring method is difficult to meet the stress measurement of pipelines and plates in service, while the ultrasonic method based on the acoustic elasticity principle can nondestructively detect the stress in the pipelines, and the nondestructive property and the portability determine that the method is one of the most promising technologies for measuring the residual stress and the working stress of the pipelines in service.
Before each measurement of the ultrasonic method, an absolute zero stress sample must be calibrated, and the proximity of the zero stress sample and the absolute zero is one of main factors influencing the stress precision of the ultrasonic method. The existing ultrasonic method stress measurement zero stress sample usually only adopts an annealing process, however, for pipeline steel with relatively large wall thickness (for example, the wall thickness is more than 10mm) or a plate with thicker thickness (for example, the thickness is more than 10mm), even if a strict annealing process is adopted, the temperature field difference caused by uneven heat dissipation of the thickness cannot be avoided in the cooling stage, so that new residual stress is brought, and the absolute zero of the zero stress is difficult to achieve; the existing zero-stress sample processing and manufacturing has no strict process flow, random sampling is carried out on an original base material, non-batch sampling processing is carried out, and the representativeness to different manufacturers, thicknesses and regions is poor; the stress release degree of the existing annealing zero-stress sample is not enough. Therefore, the development of the novel zero-stress test sample has important significance for the integrity management of the in-service pipeline and the plate by measuring and calibrating the stress by the ultrasonic method.
Disclosure of Invention
In order to solve the problems in the prior art, the invention aims to provide a zero-stress sample for an ultrasonic stress measurement method and a preparation method thereof, aims to solve the problem that the high-accuracy zero-stress sample for ultrasonic stress measurement is difficult to process and evaluate due to uneven residual stress level of a steel pipe, provides a zero-stress sample with higher precision and wider representation range for ultrasonic stress measurement, and has important significance for standardizing preparation of the ultrasonic zero-stress sample and improving the residual stress test precision.
In order to realize the purpose of the invention, the following technical scheme is adopted:
a method for preparing a zero-stress sample for an ultrasonic stress measurement method comprises the following steps:
and 7, taking the sample subjected to the stress release in the step 6 by wire cutting as a zero-stress sample.
In the step 1, when the incoming material of the zero-stress sample is selected, the material which has the same processing process with the material used for the residual stress and the stress test object is selected.
And cutting the selected material by adopting linear cutting, flame or plasma cutting, and cutting off the heat affected zone of the material by adopting linear cutting after the cutting is finished when the flame or plasma cutting is adopted.
And 3, when the sample is subjected to zero stress detection, stress measurement is carried out by adopting a small hole method, a plurality of detection points are measured, and the average value of the stress of each detection point is taken as a stress measurement value.
And 5, when the sample is subjected to zero stress detection, stress measurement is carried out by adopting a small hole method, a plurality of detection points are measured, and the average value of the stress of each detection point is taken as a stress measurement value.
The first preset value is 12Mpa, and the second preset value is 30 Mpa.
A zero-stress sample is prepared by the preparation method.
The zero-stress sample is cuboid in shape.
When the zero-stress sample is in a cuboid shape, the length direction of the sample is parallel to the material rolling direction, the width direction of the sample is perpendicular to the material rolling direction, and the height direction of the sample is the thickness direction of the material.
The invention has the following beneficial effects:
the zero stress sample preparation method for the ultrasonic stress measurement method provides a new technical means for the preparation of the zero stress sample, the stress sample closer to zero can be obtained by comprehensively eliminating stress annealing, releasing stress by linear cutting and calibrating during zero stress detection, and the stress value of the sample can be quantified by calibrating during the zero stress detection, so that the precision of ultrasonic stress detection is improved, the applicability of the ultrasonic stress detection is improved, technical support is provided for the in-service pipeline stress detection, and the method has important significance for standardizing the preparation of the ultrasonic zero stress sample and improving the residual stress testing precision of in-service pipeline steel and plates. In the invention, when the stress relief is carried out by linear cutting, the incoming material is subjected to linear cutting along the parallel material rolling direction and the vertical material rolling direction, a rectangular sample is cut by linear cutting, the length ratio of the cut sample in the parallel material rolling direction and the vertical material rolling direction is (1:1) - (1:3), or the length ratio of the cut sample in the vertical material rolling direction and the parallel material rolling direction is (1:1) - (1: 3); 1/6, the length of the sample in the direction parallel to the material rolling direction and the length of the sample in the direction vertical to the material rolling direction are not more than the height of the sample; according to the cutting direction and the cutting of the cuboid sample, the stress of the sample in each direction can be effectively released, the shrinkage stress caused by nonuniform heat distribution caused by the anisotropy of the material can be eliminated, and meanwhile, the stress of the sample is released thoroughly, so that the sample is stable in performance and can be stored for a long time, and the measurement is facilitated. In conclusion, the zero-stress sample preparation method can obtain the zero-stress sample with lower residual stress, and is beneficial to the ultrasonic stress measurement method to measure more accurate results.
The zero-stress sample disclosed by the invention is low in residual stress, and the stress testing precision of an ultrasonic method can be improved by taking the sample as a standard sample.
Drawings
FIG. 1 is a process diagram of the zero stress specimen processing of the present invention;
FIG. 2(a) is a left side view of a structure after cutting a raw material into a plurality of samples according to an embodiment of the present invention;
FIG. 2(b) is a front view of a starting material cut into a plurality of test pieces in an embodiment of the present invention;
FIG. 2(c) is a top view of a sample after being cut into a plurality of samples;
FIG. 2(d) is a left side view of an embodiment of the present invention after cutting a raw material into a plurality of samples;
fig. 2(e) is a plan view of a sample obtained by cutting a raw material into a plurality of samples in an embodiment of the present invention.
Detailed Description
The present invention is described in further detail below with reference to specific embodiments, which are given for the purpose of illustration only and are not intended to limit the scope of the invention. The invention is described in detail below with reference to the attached drawing figures:
the invention is mainly applied to zero stress calibration before stress measurement by an ultrasonic method, and performs calibration work before stress measurement aiming at different structures and different materials so as to conveniently and accurately measure the stress.
As shown in fig. 1, the method for preparing a zero-stress sample for an ultrasonic stress measurement method according to the present invention obtains the zero-stress sample by a process method of comprehensive annealing, linear cutting and multiple small-hole detection and calibration, and provides a guarantee for engineering measurement accuracy of residual stress in an ultrasonic method, and specifically includes the following steps:
step 1: selection and preparation of supplied materials for zero-stress sample calibration
Specifically, when selecting the supplied material calibrated by the zero-stress test sample, selecting a material having the same processing technological process as the material used for the residual stress and stress test object; when cutting, cutting from a rolled plate and a parent metal by adopting a linear cutting process, if a processing mode which brings heat influence such as flame cutting and plasma cutting is adopted, carrying out 2 times of linear cutting on a sample which is cut by heat, and removing a heat affected zone;
step 2: sample preparation and marking
As shown in fig. 2(a) to 2(e), in particular, sampling and cutting of the sample requires that no additional heat input can be brought, so that batch sampling is performed from the incoming materials on the rolled plate and the base metal by adopting a linear cutting process, and during sampling, rectangular parallelepiped samples are cut by performing linear cutting along a direction perpendicular to the material rolling direction and a direction parallel to the material rolling direction, wherein the length direction of the sample is parallel to the material rolling direction, the width direction of the sample is perpendicular to the material rolling direction, and the height direction of the sample is the thickness direction of the material;
and step 3: first time zero stress detection
Two samples in the samples obtained in the step 2 are extracted, wherein one sample is used for measuring the stress in the length direction, the other sample is used for measuring the stress in the width direction, the stress measurement is carried out by adopting a small hole method during measurement, each sample is used for measuring three points, the average value is obtained, and the stress measurement value is marked as sigma1The sample after punching measurement is discarded; the calibrated stress absolute value is detected according to a pinhole method, and whether the stress absolute value can be used as a zero-stress sample is determined according to a zero judgment condition, if sigma is1If not more than 12Mpa, taking the sample obtained in the step (2) as a zero-stress sample, otherwise, performing the step (4);
and 4, step 4: stress relief annealing process for determining zero-stress sample
Determining the annealing temperature, heating rate, heating speed, heat preservation time and cooling speed of each steel material according to the heat treatment temperature of different materials and considering a phase change curve; the heat treatment furnace is required to ensure uniform furnace temperature and can also carry out annealing under the vacuum condition;
and 5: stress relief annealing of test specimens
Stress relief annealing treatment is carried out on the samples in the same batch according to the annealing process in the step 4;
step 6: second zero stress test
Extracting two samples in the samples obtained in the step 5, wherein one sample is used for measuring the stress in the length direction, the other sample is used for measuring the stress in the width direction, the stress detection is carried out by adopting a small hole method during measurement, three points are measured, the average value is taken, and the marked stress measurement value is sigma2E.g. σ2If the absolute value of (a) is not more than 12MPa, the sample obtained in step (5) is taken as a zero-stress sample, and the process proceeds to step (9), if sigma is2Is greater than 30MPa, is returned to and is subjected to stress relief annealing again according to step 5, e.g. sigma2When the absolute value of the pressure difference is not more than 30MPa and more than 12MPa, entering a step 7, and abandoning the sample after punching measurement;
and 7: wire cutting further releases stress
The extra heat input cannot be brought in during cutting, so that the stress is further released by adopting linear cutting on the rest samples, and the samples are cut into cuboids by performing linear cutting along the direction vertical to the material rolling direction and the direction parallel to the material rolling direction during the linear cutting; generally, the length of the specimen is greater than the width, the width is greater than the thickness, the thickness is minimal, the ratio of the width to the length is (1:1) to (1:3), and a minimum cut size (i.e., width) of 4mm is generally recommended;
and 8: third time zero stress test
Two samples are extracted from the samples subjected to stress release in the step 7 of wire-electrode cutting, wherein one sample is used for measuring the stress in the length direction, the other sample is used for measuring the stress in the width direction, the stress detection is carried out by adopting a small hole method during measurement, three points are measured, the average value is taken, and the marked stress measurement value is sigma3The sample after punching measurement is discarded;
and step 9: and (3) the rest samples are subjected to sample handing and sealing to serve as zero-stress samples, the number of the zero-stress samples is not less than 2, 1 is used for field measurement, and 1 is used for retention.
Examples
The preparation method of the zero-stress sample for the ultrasonic stress measurement method comprises the following steps:
step 1: selection and preparation of supplied materials for zero-stress sample calibration
According to the residual stress measurement requirement of an X80 high-steel pipeline structure (the wall thickness is 21.5mm) at a certain site of a long-distance oil and gas pipeline of a certain oil company, original record information of purchasing, production and the like is consulted, and an X80 high-steel grade pipeline material which is the same as a material supplying manufacturer and a same pipe manufacturing processing technology of a tested object is selected as a zero-stress sample processing sampling material.
The raw material for preparing the sample is obtained by cutting the X80 parent metal by adopting a linear cutting process, and the processing and sampling mode which brings thermal influence by flame, plasma cutting and the like is avoided as much as possible.
If a processing mode which brings heat influence by flame, plasma cutting and the like is adopted for sampling from the X80 parent metal, the heat affected area of four sides of a heat cut sample needs to be removed by adopting a linear cutting process again, and the distance between the cutting position of each single side of the four sides and the edge of a material needs to be more than 100mm by adopting the linear cutting process, so that the heat cutting influence of flame and the like is eliminated.
Step 2: sample preparation and marking
The method comprises the following steps of 1, preparing a sample on a raw material obtained by linear cutting in step 1 by adopting a linear cutting process, carrying out linear cutting along the direction vertical to the rolling direction and the direction parallel to the rolling direction during sample preparation, and cutting out a cuboid sample, wherein the length direction of the sample is parallel to the material rolling direction, the width direction is vertical to the material rolling direction, the height direction is the thickness direction of the material, one batch of samples are generally not less than 8, 4 of the samples are used for measuring the residual stress parallel to the rolling direction, and 4 of the samples are used for measuring the residual stress vertical to the rolling direction.
And step 3: first time zero stress detection
Two samples in the samples obtained in the step 2 are extracted, wherein one sample is used for measuring the stress in the length direction, the other sample is used for measuring the stress in the width direction, the stress measurement is carried out by adopting a small hole method during measurement, each sample is used for measuring three points, the average value is obtained, and the stress measurement value is marked as sigma1. The sample after the measurement of the punched hole is discarded.
E.g. sigma1When the absolute value of the pressure difference is less than 12MPa, the pressure difference can be regarded as a zero-stress sample, and the subsequent process is avoidedAnd (5) carrying out the following steps.
And 4, step 4: stress relief annealing process for determining zero-stress sample
According to the heat treatment temperature of the material, the phase change curve is considered, and the annealing temperature, the heating rate, the heating speed, the heat preservation time and the cooling speed are determined.
In the embodiment, the annealing temperature of the sample is 480 ℃, the heat preservation time is not less than 2 hours, and the sample is taken after being cooled to the room temperature along with the furnace.
The heat treatment furnace requires uniform furnace temperature, and the furnace temperature maintaining precision is not lower than plus or minus 10 ℃; the annealing may be performed under vacuum if necessary.
And 5: stress relief annealing of test specimens
And 4, annealing the other samples in a heat treatment furnace according to the annealing process in the step 4.
Step 6: second zero stress test
Extracting two samples in the samples obtained in the step 5, wherein one sample is used for measuring the stress in the length direction, the other sample is used for measuring the stress in the width direction, the stress detection is carried out by adopting a small hole method during measurement, three points are measured, the average value is taken, and the marked stress measurement value is sigma2E.g. σ2Until the absolute value of (a) is not more than 12MPa, the sample obtained in step (5) is taken as a zero-stress sample, and the process proceeds to step (9), where σ is2Is greater than 30MPa, and returns to step 5 to carry out annealing again, such as sigma2When the absolute value of the pressure difference is not more than 30MPa and more than 12MPa, the step 7 is carried out, and the sample after punching measurement is discarded.
And 7: wire cutting further releases stress
And (4) further releasing the stress of the residual test sample after the detection by adopting linear cutting. Wherein, the minimum block size of the wire cutting is 2mm for the pipeline structure material with the wall thickness of 20mm, and the reserved size of the sample in the thickness direction is not less than 3 mm.
And 8: third time zero stress test
Two samples after the stress release of the wire-electrode cutting in the step 7 are extracted, wherein one sample is used for measuring the stress in the length direction, and the other sample is used for measuring the stress in the width directionThe stress is detected by a small hole method during measurement, three points are measured, the average value is taken, and the stress measurement value is marked as sigma3And the sample after punching measurement is discarded. Sigma3Is less than 12 MPa.
And step 9: hand-over sample sealing
The residual zero-stress sample is not less than 2, 1 is used for field measurement, and 1 is used for retention.
Numbering zero samples at the same time, recording the processing process including raw material furnace batch number information, processing, sampling and cutting method, and sigma1、σ2、σ3And calibrating the type, parameters and the like of the strain gauge by a small hole method, and checking after preparation.
Claims (9)
1. A method for preparing a zero-stress sample for an ultrasonic stress measurement method is characterized by comprising the following steps of:
step 1, selecting incoming materials of a zero-stress sample;
step 2, cutting the material into a plurality of samples in a linear mode, during linear cutting, performing linear cutting on the incoming material along a direction parallel to the material rolling direction and a direction perpendicular to the material rolling direction, and performing linear cutting to obtain a rectangular sample;
step 3, selecting a plurality of samples obtained in the step 2 to perform zero stress detection, detecting the stress on the samples in the direction parallel to the rolling direction of the material and in the direction vertical to the rolling direction of the material when the samples are subjected to the zero stress detection, and if the absolute value of the stress measured value of the detected samples is not greater than a first preset value, taking the samples obtained in the step 2 as zero stress samples; if the absolute value of the stress measured value of the tested sample is greater than the first preset value, performing step 4, and invalidating the sample subjected to zero-stress detection;
step 4, performing stress relief annealing on the residual sample obtained in the step 2;
step 5, carrying out zero stress detection on the sample obtained in the step 4, and if the absolute value of the stress measurement value of the sample to be detected is not greater than a first preset value, taking the sample obtained in the step 4 as a zero stress sample; if the absolute value of the stress measured value of the tested sample is larger than the first preset value and is not larger than the second preset value, the sample after zero stress detection is discarded, and then the step 4 is carried out; if the absolute value of the stress measured value of the tested sample is greater than the second preset value, the sample after zero stress detection is discarded, and then the step 6 is carried out;
step 6, performing linear cutting on the sample obtained in the step 4, releasing stress, and performing linear cutting on the incoming material along the parallel material rolling direction and the vertical material rolling direction during the linear cutting, wherein the length ratio of the cut sample in the parallel material rolling direction to the vertical material rolling direction is (1:1) - (1:3), or the length ratio of the cut sample in the vertical material rolling direction to the parallel material rolling direction is (1:1) - (1: 3); 1/6, the length of the sample in the direction parallel to the material rolling direction and the length of the sample in the direction vertical to the material rolling direction are not more than the height of the sample;
and 7, taking the sample subjected to the stress release in the step 6 by wire cutting as a zero-stress sample.
2. The method for preparing the zero-stress sample for the ultrasonic stress measurement method according to claim 1, wherein in the step 1, when the material of the zero-stress sample is selected, a material having the same processing technology as that of the material of the residual stress and stress test object is selected.
3. The method for preparing a zero-stress sample for an ultrasonic stress measurement method according to claim 2, wherein the selected material is cut by wire cutting, flame cutting or plasma cutting, and when the flame cutting or plasma cutting is adopted, the heat affected zone of the material is cut off by wire cutting after the cutting is finished.
4. The method for preparing the zero-stress sample for the ultrasonic stress measurement method according to claim 1, wherein in the step 3, when the sample is subjected to zero-stress detection, stress measurement is performed by using a pinhole method, a plurality of detection points are measured, and an average value of the stress of each detection point is taken as a stress measurement value.
5. The method for preparing the zero-stress sample for the ultrasonic stress measurement method according to claim 1, wherein in the step 5, when the sample is subjected to zero-stress detection, stress measurement is performed by using a pinhole method, a plurality of detection points are measured, and an average value of the stress of each detection point is taken as a stress measurement value.
6. The method of any one of claims 1-5, wherein the first predetermined value is 12MPa and the second predetermined value is 30 MPa.
7. A zero-stress test specimen obtained by the production method according to any one of claims 1 to 6.
8. The zero stress specimen according to claim 7, wherein the zero stress specimen is in the shape of a rectangular parallelepiped.
9. The zero stress specimen according to claim 8, wherein the zero stress specimen has a length direction parallel to the material rolling direction, a width direction perpendicular to the material rolling direction, and a height direction in the thickness direction of the material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010108643.3A CN113295327B (en) | 2020-02-21 | 2020-02-21 | Zero-stress sample for ultrasonic stress measurement method and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010108643.3A CN113295327B (en) | 2020-02-21 | 2020-02-21 | Zero-stress sample for ultrasonic stress measurement method and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113295327A true CN113295327A (en) | 2021-08-24 |
| CN113295327B CN113295327B (en) | 2024-05-28 |
Family
ID=77317693
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010108643.3A Active CN113295327B (en) | 2020-02-21 | 2020-02-21 | Zero-stress sample for ultrasonic stress measurement method and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113295327B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2439130A (en) * | 1943-11-20 | 1948-04-06 | United Aircraft Corp | Surface and shear wave method and apparatus |
| CN102608169A (en) * | 2012-03-01 | 2012-07-25 | 首钢总公司 | Method for determining precision of blind-hole method residual stress testing system |
| CN102818763A (en) * | 2012-07-30 | 2012-12-12 | 首钢总公司 | Hot-rolled steel plate residual stress calculating method suitable to production field |
| CN104913876A (en) * | 2015-06-23 | 2015-09-16 | 南车青岛四方机车车辆股份有限公司 | Device and method for manufacturing aluminum alloy vehicle body residual stress measurement zero-stress test block based on ultrasonic method |
| JP2017032478A (en) * | 2015-08-05 | 2017-02-09 | 株式会社神戸製鋼所 | Residual stress evaluation method |
-
2020
- 2020-02-21 CN CN202010108643.3A patent/CN113295327B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2439130A (en) * | 1943-11-20 | 1948-04-06 | United Aircraft Corp | Surface and shear wave method and apparatus |
| CN102608169A (en) * | 2012-03-01 | 2012-07-25 | 首钢总公司 | Method for determining precision of blind-hole method residual stress testing system |
| CN102818763A (en) * | 2012-07-30 | 2012-12-12 | 首钢总公司 | Hot-rolled steel plate residual stress calculating method suitable to production field |
| CN104913876A (en) * | 2015-06-23 | 2015-09-16 | 南车青岛四方机车车辆股份有限公司 | Device and method for manufacturing aluminum alloy vehicle body residual stress measurement zero-stress test block based on ultrasonic method |
| JP2017032478A (en) * | 2015-08-05 | 2017-02-09 | 株式会社神戸製鋼所 | Residual stress evaluation method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113295327B (en) | 2024-05-28 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106289975B (en) | Method for testing fracture toughness of material micro-area | |
| CN104596845A (en) | Measuring method for real stress-strain curve of metal welding structure | |
| CN104777046B (en) | Fatigue crack propagation mechanism testing method based on small time scale | |
| CN101109728A (en) | Method for monitoring ferromagnetic material fatigue crack expansion by variated magnetic signal | |
| CN102221352A (en) | Method for measuring depth of alloy steel decarbonized layer | |
| CN104597137A (en) | Ultrasonic testing block group for residual stress of aluminum alloy prestretching plate and application method thereof | |
| KR20180127095A (en) | Estimation Apparatus and Method of Creep Crack Rate and Relevant Growth Fracture Parameters for Small Punch Specimen with a Micro Groove | |
| CN113295327B (en) | Zero-stress sample for ultrasonic stress measurement method and preparation method thereof | |
| CN110376226B (en) | Method for determining crack propagation characteristics of turbine engine rotor | |
| CN108982178A (en) | A kind of preparation method of galvanized steel plain sheet standard sample | |
| JP5004324B2 (en) | Repair method for molds containing magnetic material | |
| CN113053471B (en) | Method for nondestructive on-line detection of Brinell hardness of fan spindle | |
| CN110631907B (en) | Preparation method of standard sample for verifying uniformity of steel for reaming and use performance of punching and reaming device | |
| CN101603872B (en) | Indirect test method for explosion-proof pressure of metal battery shell | |
| CN113607513B (en) | Test block and method capable of rapidly checking hardness value of low-hardness 91 steel | |
| CN103207204B (en) | Standard sample used for detecting specific thermal deflection property and its preparation method | |
| CN105865936B (en) | The low-temperature bending detection method of metal material | |
| KR102525296B1 (en) | Apparatus for measuring coating layer thickness of steel sheet | |
| CN103604392B (en) | A kind of assay method of the phosphating coat degree of depth | |
| WO2023106047A1 (en) | Steel plate manufacturing method and steel plate manufacturing equipment line | |
| CN114781113B (en) | Prediction model for crack arrest temperature of high-strength steel thick plate for ship and construction method and application thereof | |
| CN116990121A (en) | Measuring method for plastic strain ratio r value of metal sheet | |
| CN111974814B (en) | Directional sampling evaluation method after head-end furnace continuous casting billet rolling | |
| CN117490826A (en) | Magnetostrictive noise source confirmation method and core production method | |
| CN110008631B (en) | Parameter simulation method and verification method in copper pipe rolling and cooling processes |
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 | ||
| GR01 | Patent grant |