2.25cr-1mo steel fatigue crack growth monitoring and hydrogen embrittlement evaluation method

Abstract

The invention discloses a method for monitoring fatigue crack propagation and evaluating hydrogen brittleness of 2.25Cr-1Mo steel based on sound emission, and belongs to the technical field of nondestructive examination and nondestructive evaluation of materials. According to the method disclosed by the invention, by using a sound emission technology, comparative analysis is performed on sound emission signals of an original state material and a hydrogen brittleness state material by monitoring and analyzing sound emission signal characteristics in a fatigue crack propagation process of the 2.25Cr-1Mo steel, and the hydrogen brittleness condition of a material is evaluated by virtue of a proportion of signals of more than 60dB. The method disclosed by the invention can be applied to online monitoring and nondestructive evaluation of a hydrogenation reactor, and compared with a conventional method for evaluating hydrogen brittleness of materials, the method disclosed by the invention has the characteristics of low cost and high speed (1 hour) and has relatively great application prospects.

Description

technical field [0001] The invention belongs to the technical field of non-destructive testing and non-destructive evaluation of materials, and relates to a method for evaluating the hydrogen embrittlement of materials by monitoring acoustic emission signals in the process of fatigue crack propagation, specifically, a 2.25Cr-1Mo based on acoustic emission Steel fatigue crack growth monitoring and hydrogen embrittlement evaluation method. Background technique [0002] 2.25Cr-1Mo steel is often served in hydrogen environment, and hydrogen embrittlement will inevitably occur. The existing hydrogen embrittlement evaluation methods for materials are all destructive. During the sample preparation process, the hydrogen inside the material has escaped, so it is impossible to accurately evaluate the degree of hydrogen embrittlement of the material. Therefore, it is necessary to develop a non-destructive evaluation method to evaluate the hydrogen embrittlement status of materials in ...

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that the workload is large, and because the stress state of the test plate and the wall material is different, the measured results cannot truly reflect the hydrogen embrittlement of the wall material

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