Magnetic nondestructive testing method for testing ferritic transformation quantity of austenitic stainless steel after being subjected to ion irradiation

Abstract

The invention discloses a magnetic nondestructive testing method for testing the ferritic transformation quantity of austenitic stainless steel after being subjected to ion irradiation. The method comprises the following steps that (1) austenitic stainless steel is subjected to solution treatment after being processed to be round sheets; (2) the round sheets are subjected to magnetic testing, anda hysteresis loop first M-H curve of non-irradiated austenitic stainless steel is obtained; (3) the round sheets are subjected to ion irradiation, and the equivalent thickness L1 in an ion irradiationdestructive area is obtained; (4) the irradiated austenitic stainless steel is subjected to magnetic testing, and a hysteresis loop second M-H curve of the irradiated austenitic stainless steel is obtained; (5) the contribution of the non-irradiated austenitic stainless steel on the first M-H curve is deducted from the second M-H curve, and the specific saturation magnetization Ms of the irradiated austenitic stainless steel is obtained; (6) the specific saturation magnetization Mst of the irradiation destructive part is calculated by adopting the formula I (detailed description is shown in the original text); and (7) the ferritic transformation quantity of austenitic stainless steel after obtaining ion irradiation is calculated by adopting the formula II (detailed description is shown inthe original text). The method is convenient to test, the sample size is small, the data accuracy is high, and the repeatability is good.

Description

technical field [0001] The invention belongs to the field of metal material detection, and in particular relates to a magnetic non-destructive detection method capable of realizing the transformation of ferrite after ion irradiation of austenitic stainless steel. Background technique [0002] Many key components in nuclear reactors are often made of austenitic stainless steel with good comprehensive performance (such as reactor internals, neutron flux measurement finger casing, etc.). These austenitic stainless steel components are the key equipment of nuclear power plants, which are directly related to the safety and efficiency of reactor operation. However, austenitic stainless steel is an unstable alloy. After neutron irradiation, austenite will transform to ferrite, which will then cause radiation-accelerated stress corrosion cracking, radiation embrittlement, and radiation hardening of stainless steel. The radiation effect changes the mechanical properties and corrosio...

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Problems solved by technology

However, compared with the uniform damage formed by neutron irradiation, the irradiation damage depth of austenitic stainless steel after ion irradiation is shallow (for conventional ion irradiation platforms, the maximum irradiation damage depth is only a few microns; for high-energy ion irradiation platform, due to the high cost of the test and the low irradiation fluence rate, the relevant research cannot actually be carried out), which makes it impossible to directly obtain the data of the ferrite phase by conventional testing and analysis methods (such as conventional X-ray diffraction); if iron Ferrite instrument, considering the problem of resolution and the problem of small ion irradiation damage depth (tens of nanometers to several micrometers), it is impossible to obtain effective ferrite content measurement data

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