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Magnetic evaluation method for irradiation accelerated stress corrosion cracking sensitivity of austenitic stainless steel

An austenitic stainless steel, corrosion cracking technology, applied in the direction of material magnetic variables, preparation of test samples, etc., can solve the problem of inability to obtain ion irradiation samples IASCC sensitivity, unfavorable test work development, tensile sample materials There are many other problems to achieve the effect of fast test speed, simple test and small human factors.

Active Publication Date: 2019-08-27
SUZHOU NUCLEAR POWER RES INST +2
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Problems solved by technology

I was obtained due to the macroscopic tensile test IASCC When the conventional ion irradiation damage distribution area is mainly located in the shallow surface layer of the sample (on the order of tens of nanometers to ten microns), SSRT cannot obtain the IASCC sensitivity of the ion irradiated sample.
Since the SSRT process involves the development of the tensile test, there are relatively many steps, it takes a long time, and the materials used for the tensile sample are many, and the tensile test is a destructive test. Considering the high cost of the neutron irradiation test (thousand 10,000 level and above) and radioactive issues, which are not conducive to the development of testing work

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  • Magnetic evaluation method for irradiation accelerated stress corrosion cracking sensitivity of austenitic stainless steel
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  • Magnetic evaluation method for irradiation accelerated stress corrosion cracking sensitivity of austenitic stainless steel

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specific Embodiment

[0067] In order to evaluate the radiation-accelerated stress corrosion cracking susceptibility of an austenitic stainless steel at room temperature after irradiation to 7dpa, 15dpa and 25dpa, the following steps are used for evaluation:

[0068] (1) Measure and record the M-H curve of the initial sample of austenitic stainless steel to be evaluated, the results are as follows figure 1 shown. Depend on figure 1 It can be seen that M and H of the initial sample of austenitic stainless steel have a linear relationship, which conforms to M(H)=χ p H relationship, and χ p =4.9×10 -3 , applicable to this IASCC sensitivity assessment method.

[0069] (2) Process the initial sample of austenitic stainless steel into a diameter of d=3mm and a thickness of L 0 = 25μm disc as the test sample; after the processing is completed, measure the M-H curve of the test sample again to obtain the processed χ p =4.9×10 -3 , indicating that the processing of the sample does not introduce addi...

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Abstract

The invention belongs to the field of metal material detection, and particularly relates to a magnetic evaluation method for irradiation accelerated stress corrosion cracking sensitivity of austeniticstainless steel. The method comprises the following steps of: carrying out applicability analysis; carrying out sample processing and availability assessment; detecting saturation magnetization intensity Ms and corresponding magnetic field intensity Hs of a test sample under an irradiation condition to be evaluated; determining a zero IASCC sensitivity annealing condition; carrying out vacuum environment heat treatment on the irradiated test sample under a determined annealing condition; measuring an M-H curve of the annealed test sample to obtain a saturation magnetization MT,t correspondingto the saturation magnetic field intensity Hs of the test sample with zero IASCC sensitivity after irradiation; and calculating to obtain the IASCC sensitivity of the austenitic stainless steel undera certain irradiation condition. According to the invention, the corresponding IASCC sensitivity index can be obtained by measuring the Ms in the M-H curve under different conditions, so that the IASCC performance of the sample can be obtained quickly and accurately, and the method has the advantages of simplicity in operation, high efficiency, high reliability, good repeatability and small humanfactor.

Description

technical field [0001] The invention belongs to the field of metal material detection, and in particular relates to a magnetic evaluation method for austenitic stainless steel irradiation accelerated stress corrosion cracking sensitivity. Background technique [0002] Irradiation-accelerated stress corrosion cracking (IASCC) susceptibility has significant engineering significance, such as the I IASCC The larger the value, the greater the possibility of IASCC fracture of stainless steel components under service conditions, and the more likely the material will fail. IASCC Sensitivity Index I IASCC It reflects the ability of metal materials to resist IASCC cracking, and is an index to characterize the material performance of metal materials in stress and corrosion environments after irradiation. [0003] However, for I IASCC There is no direct and quick method for the determination of . The usual method is to subject the irradiated sample to a slow strain tensile test (SSR...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/83G01N1/44
CPCG01N27/83G01N1/44
Inventor 徐超亮刘向兵薛飞李远飞钱王洁
Owner SUZHOU NUCLEAR POWER RES INST
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