Method for predicting change trend of impact toughness of Cr13 super stainless steel in lossless and in-situ detection manner

Abstract

The invention provides a nondestructive and in-situ detectable method for predicting the change trend of the impact toughness of Cr13 super stainless steel, which comprises the following steps: carrying out electrochemical impedance analysis test on a test sample to obtain the impact toughness of the test sample after the open-circuit potential is stabilized and the charge transfer resistance Rt corresponding to the impact toughness; and predicting the change trend of the impact toughness of the Cr13 super stainless steel according to the relationship between the charge transfer resistance Rt and the impact toughness of the test sample. According to the method, the change trend of the impact toughness of the Cr13 super martensitic stainless steel, especially the Cr13 super martensitic stainless steel subjected to tempering or long-time aging treatment, is predicted by utilizing an electrochemical impedance technology, and precipitated phases such as carbides in the Cr13 super martensitic stainless steel are detected by taking the charge transfer resistance Rt as a prediction index; and the change of the impact toughness of the material is evaluated, so that the corresponding production is guided to be safely carried out.

Description

technical field [0001] The invention relates to the technical field of electrochemical testing of stainless steel, in particular to a non-destructive and in-situ detection method for predicting the change trend of the impact toughness of Cr13 super stainless steel. Background technique [0002] Cr13 super martensitic stainless steel has high strength, hardness and good corrosion resistance, and is widely used in oil pipelines, marine, nuclear industry and other fields. However, during long-term aging, tempering treatment or at the stainless steel weld, it is easy to precipitate Cr-rich carbides, which will reduce the mechanical properties and corrosion resistance of Cr13 super martensitic stainless steel, especially when the carbides are along the After the grain boundary is coarsened, the plasticity and toughness of the material will be significantly reduced, resulting in accidents. Therefore, for Cr13 super martensitic stainless steel, it is particularly important to dete...

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Problems solved by technology

[0003] The traditional method of analyzing carbides is through scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Since these methods generally require high requirements for equipment, samples and personnel, they can usually only be carried out in scientific laboratories, and Limited to microscopic qualitative or semi-quantitative, it is impossible to realize macroscopic quantitative detection of carbides in stainless steel

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