CN103063124B - A kind of detection method of austenitic stainless steel amount of plastic deformation - Google Patents
A kind of detection method of austenitic stainless steel amount of plastic deformation Download PDFInfo
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- CN103063124B CN103063124B CN201210550221.7A CN201210550221A CN103063124B CN 103063124 B CN103063124 B CN 103063124B CN 201210550221 A CN201210550221 A CN 201210550221A CN 103063124 B CN103063124 B CN 103063124B
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Abstract
The present invention relates to a kind of detection method of austenitic stainless steel amount of plastic deformation.Be characterized in, comprise the steps: that (1) is to different austenitic stainless steel materials, makes serial test specimen; (2) serial test specimen is carried out to the damage of different plastic degree, detect its amount of plastic deformation simultaneously; (3) DC magnetization is carried out to the test specimen after damage; (4) magnetic field measuring device is adopted to measure the residual magnetic field intensity of different test specimen; (5) the demarcation relation curve (5) of austenitic stainless steel amount of plastic deformation and residual magnetic field intensity is obtained; (6) DC magnetization is carried out to austenitic stainless steel detected object; (7) according to the residual magnetic field intensity detected, compare with demarcation relation curve (5), draw the actual amount of plastic deformation of corresponding detected object.Before adopting lossless detection method of the present invention can produce weak magnetic austenitic stainless steel material gross imperfection, plastic deformation degree carries out quantitative NDT, has filled up the blank of this art detection method.
Description
Technical field
The present invention relates to the method for carrying out Non-Destructive Testing by artificial DC magnetization means, especially a kind of detection method of austenitic stainless steel amount of plastic deformation.
Background technology
Austenitic stainless steel, because of its superior mechanical property, corrosion resistivity, weak magnetic characteristic, is widely used for the component manufacturing nuclear power generating equipment.In order to ensure the security of operation of nuclear power generating equipment, the faulted condition before its macroscopic cracking produces detects and just becomes extremely important.The plastic yield caused by power is then induction and the key factor advancing material damage, therefore just becomes to the detection of plastic deformation degree the main points that austenitic stainless steel macroscopic cracking produces front faulted condition detection.
For the austenitic stainless steel of magnetic weak under normality, ferromagnetism martensitic phase is produced during plastic yield can cause weak magnetic austenite mutually, and the ferromagnetism phase amount produced is dull relevant to plastic deformation degree, this kind of phenomenon is called as " deformation induced phase transformation " phenomenon.Therefore, just its plastic deformation degree can be back-calculated to obtain by detecting ferromagnetism phase content in austenitic stainless steel.At present, in engineering, there is the ferrite content analyzer based on electromagnetic induction principle, the quantitative NDT to ferromagnetism phase content in austenitic stainless steel can have been realized.But need larger excitation current when this testing equipment detects, and can only pointwise detect, make often to detect and a bit excite once, detect the used time longer, current sinking is comparatively large, and detection efficiency is lower.What is more important, it just achieves the mensuration to ferritic phase content in austenitic stainless steel, is not associated with plastic deformation degree in material by ferritic phase content.
Summary of the invention
The object of this invention is to provide a kind of detection method of austenitic stainless steel amount of plastic deformation, quantitative NDT can be carried out to the plastic deformation degree before weak magnetic austenitic stainless steel material gross imperfection generation.
A detection method for austenitic stainless steel amount of plastic deformation, its special feature is, comprises the steps:
(1) to different austenitic stainless steel materials, serial test specimen is made;
(2) utilize drawing machine to carry out the damage of different plastic degree to serial test specimen, utilize amount of plastic deformation checkout equipment to detect its amount of plastic deformation simultaneously;
(3) test specimen after damage is carried out to the DC magnetization in prescribed strength and direction;
(4) magnetic field measuring device is adopted to measure the residual magnetic field intensity of prescribed direction after different test specimen DC magnetization;
(5) the amount of plastic deformation one_to_one corresponding measured in the residual magnetic field intensity obtained and step (2) is associated, just obtain the demarcation relation curve of residual magnetic field intensity after austenitic stainless steel amount of plastic deformation and DC magnetization;
(6) austenitic stainless steel detected object is carried out to the DC magnetization in prescribed strength and direction in step (3), the residual magnetic field intensity after then adopting magnetic field measuring device to measure detected object DC magnetization;
(7) according to the residual magnetic field intensity detected, the demarcation relation curve obtained with step (5) is compared, and draws the actual amount of plastic deformation of corresponding detected object.
In step (1), different austenitic stainless steel materials comprises 304,316 models.
In step (2), different plastic deformation degree refers to plastic yield within the scope of 0-30%.
In step (2), amount of plastic deformation checkout equipment refers to optical strain checkout equipment.
The DC magnetization in prescribed strength and direction refers to 200mT D.C. magnetic field, DC magnetization perpendicular to detected object surface direction in step (3).
Magnetic field measuring device in step (4) refers to fluxgate magnetic field measurement mechanism.
Before adopting lossless detection method of the present invention can produce weak magnetic austenitic stainless steel material gross imperfection, plastic deformation degree carries out quantitative NDT, has filled up the blank of this art detection method.After the artificial DC magnetization of this method single by within the scope of the quick detection of magnetized of rapid scanning mode amount of plastic deformation a little, have simple to operate, detection efficiency is high, without the need to advantages such as surface treatments, can be widely used in the plastic deformation degree Nondestructive Evaluation of nuclear power, chemical industry, special equipment contour safety requirements austenite stainless steel beam column.
Accompanying drawing explanation
Fig. 1 is physical principle schematic diagram of the present invention;
Fig. 2 is plastic yield importing and instrumentation plan in demarcating in embodiment 1;
Fig. 3 is DC magnetization schematic diagram in demarcating in embodiment 1;
Fig. 4 is that in demarcating in embodiment 1, DC magnetization residual magnetic field ionization meter and calibration curve (5) become mode schematic diagram;
Fig. 5 carries out DC magnetization schematic diagram to parts to be checked in embodiment 1;
Fig. 6 measures parts residual magnetic field to be checked and utilizes calibration curve (5) correspondence to go out amount of plastic deformation in embodiment 1.
Embodiment
As shown in Figure 1, the inventive method is based on weak magnetic austenitic stainless steel " deformation induced phase transformation " phenomenon, namely plastic yield can cause producing ferromagnetism martensitic phase in weak magnetic austenitic stainless steel, and the ferromagnetism phase amount produced is dull quantitatively relevant to plastic deformation degree.So just dullness can derive its plastic deformation degree by the ferromagnetism phase content detected in austenitic stainless steel.On the other hand, in order to improve susceptibility and the antijamming capability of detection signal, by the DC magnetization method to austenitic stainless steel, make the ferromagnetism phase magnetic enhancement in austenitic stainless steel, and its residual magnetic field intensity is dull relevant to ferromagnetism phase amount, thus the ferromagnetism phase amount in phenogram 1 can be carried out by residual magnetic field intensity.Again because austenitic stainless steel ferromagnetism phase amount and amount of plastic deformation are dull quantitatively relevant, so artificial DC magnetization residual magnetic field intensity is dull relevant to amount of plastic deformation in austenitic stainless steel.
Embodiment 1:
The first step: austenitic stainless steel amount of plastic deformation---DC magnetization residual magnetic field intensity calibration curve method for building up, concrete steps comprise:
1) with reference to Fig. 2, make the serial test specimen of austenitic stainless steel 304, utilize drawing machine to stretch to it, import plastic yield ε in various degree
1, ε
2, ε
3ε
n, namely 0.5%, 1%, 2% ... 30%, and the plastic deformation degree ε being measured different test specimen by optical strain checkout equipment 6
1, ε
2, ε
3ε
n.
2) with reference to Fig. 3, intensity 200mT DC magnetization device 2 is adopted to carry out the DC magnetization perpendicular to detected object surface direction to all test specimens.
3) with reference to Fig. 4, fluxgate magnetic field measurement mechanism 4 is adopted to measure residual magnetic field intensity B perpendicular to detected object surface direction after all test specimen DC magnetizations
1, B
2, B
3b
n, and by ε that itself and optical strain checkout equipment 6 are measured
1, ε
2, ε
3ε
none_to_one corresponding, forms the demarcation relation curve 5 of residual magnetic field intensity level B and amount of plastic deformation ε.
Second step: the DC magnetization method for quantitative measuring of austenite stainless steel beam column amount of plastic deformation to be checked, concrete steps comprise:
1) with reference to Fig. 5, for austenite stainless steel part 1 to be checked, DC magnetization device 2 pairs of austenite stainless steel parts of employing intensity 200mT carry out the artificial DC magnetization perpendicular to detected object surface direction.
2) with reference to Fig. 6, adopt fluxgate magnetic field measurement mechanism 4 to scan austenite stainless steel part 1 to be checked through step 1) in different measuring point to be checked, vertical surface direction residual magnetic field intensity B on artificial magnetization rear surface
i, by B
icompare with demarcation relation curve 5, thus correspondence goes out the amount of plastic deformation ε of each point in austenitic stainless steel to be checked
i.
Claims (5)
1. a detection method for austenitic stainless steel amount of plastic deformation, is characterized in that, comprises the steps:
(1) to different austenitic stainless steel materials, serial test specimen is made;
(2) utilize drawing machine to carry out the damage of different plastic degree to serial test specimen, utilize amount of plastic deformation checkout equipment to detect its amount of plastic deformation simultaneously;
(3) test specimen after damage is carried out to the DC magnetization in prescribed strength and direction;
(4) magnetic field measuring device is adopted to measure the residual magnetic field intensity of prescribed direction after different test specimen DC magnetization;
(5) the amount of plastic deformation one_to_one corresponding measured in the residual magnetic field intensity obtained and step (2) is associated, just obtain the demarcation relation curve (5) of residual magnetic field intensity after austenitic stainless steel amount of plastic deformation and DC magnetization;
(6) austenitic stainless steel detected object is carried out to the DC magnetization in prescribed strength and direction in step (3), the residual magnetic field intensity after then adopting magnetic field measuring device to measure detected object DC magnetization;
(7) according to the residual magnetic field intensity detected, the demarcation relation curve (5) obtained with step (5) is compared, and draws the actual amount of plastic deformation of corresponding detected object;
Wherein the DC magnetization in prescribed strength and direction refers to 200mT D.C. magnetic field, DC magnetization perpendicular to detected object surface direction in step (3).
2. the detection method of a kind of austenitic stainless steel amount of plastic deformation as claimed in claim 1, is characterized in that: in step (1), different austenitic stainless steel materials comprises 304,316 models.
3. the detection method of a kind of austenitic stainless steel amount of plastic deformation as claimed in claim 1, is characterized in that: in step (2), different plastic deformation degree refers to plastic yield within the scope of 0-30%.
4. the detection method of a kind of austenitic stainless steel amount of plastic deformation as claimed in claim 1, is characterized in that: in step (2), amount of plastic deformation checkout equipment refers to optical strain checkout equipment (6).
5. the detection method of a kind of austenitic stainless steel amount of plastic deformation as claimed in claim 1, is characterized in that: the magnetic field measuring device in step (4) refers to fluxgate magnetic field measurement mechanism (4).
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| CN105158326B (en) * | 2015-09-11 | 2019-04-19 | 中国特种设备检测研究院 | For measuring the detection method of martensite content in austenitic stainless steel |
| CN105606017B (en) * | 2015-12-25 | 2019-04-12 | 北方民族大学 | A kind of main plastic strain orientation of ferromagnetic material and quantitative magnetic detection method |
| CN107238655B (en) * | 2017-07-03 | 2020-11-20 | 重庆科技学院 | Method for quantitatively measuring plastic deformation of austenitic stainless steel through magnetic property |
| CN107478168B (en) * | 2017-07-17 | 2019-06-21 | 浙江大学 | The stamping end socket plastic deformation system for measuring quantity of austenitic stainless steel and method |
| CN109709204B (en) * | 2018-12-29 | 2022-09-27 | 宜昌华腾管道工程有限公司 | Ferromagnetic material plastic deformation detection method based on multi-magnetic parameter extraction |
| CN110644540A (en) * | 2019-08-06 | 2020-01-03 | 广州市市政工程试验检测有限公司 | Device and method for detecting length of rock-socketed pile of existing building |
| CN113189192B (en) * | 2021-05-28 | 2024-08-30 | 中国特种设备检测研究院 | Rapid detection method for stainless steel deformation type |
| CN115449622B (en) * | 2022-11-10 | 2023-03-24 | 江苏新恒基特种装备股份有限公司 | Method and system for controlling size of stainless steel deformation recrystallization grains |
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