Nonlinear ultrasonic detection grading evaluation method for performance degradation of heat-resistant steel part

Abstract

The invention discloses a non-linear ultrasonic testing, grading evaluation method for performance degradation of a heat-resistant steel part, which comprises the following steps: manufacturing an initial manual comparison micro sample, obtaining the failure time of a performance degradation acceleration test of the heat-resistant steel part, manufacturing a manual comparison micro sample group for non-linear ultrasonic testing, grading and evaluating, building a nonlinear high-energy ultrasonic testing system, testing ultrasonic nonlinear coefficients of an artificial contrast micro sample group for nonlinear ultrasonic detection grading evaluation, drawing a weighted average ultrasonic nonlinear coefficient-performance degradation damage level reference curve, and performing performance degradation damage level evaluation on the heat-resistant steel part to be detected; predicting the residual life of the heat-resistant steel part to be detected. According to the method, grading evaluation of nonlinear ultrasonic detection of performance degradation of the heat-resistant steel part is realized, the performance degradation degree of the heat-resistant steel part can be measured, the residual life of the detected heat-resistant steel part can be predicted, and the quantitative grading problem of nonlinear ultrasonic detection of the performance degradation of the heat-resistant steel part is solved.

Description

technical field [0001] The invention relates to the technical field of performance detection of heat-resistant steel parts, and more specifically relates to a non-linear ultrasonic detection and classification evaluation method for performance degradation of heat-resistant steel parts. Background technique [0002] Most of the workpieces subjected to high temperature and high pressure conditions are made of heat-resistant steel materials, such as high-temperature and high-pressure pipes, pipe fittings, valves, etc. in power plants and chemical plants. With the prolongation of service time, heat-resistant steel components gradually age to complete failure, and the main performance degradation mechanisms include high-temperature performance degradation, thermal fatigue, and performance degradation-fatigue interaction. [0003] In the prior art, destructive methods (such as pipe cutting, overall sectioning, etc.) are usually used to sample heat-resistant steel workpieces, and t...

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Problems solved by technology

[0005] The Chinese patent with the publication number: 108107111B introduces a nonlinear ultrasonic testing method for heat-resistant steel parts. This patent is based on nonlinear acoustic testing technology, which can effectively solve the Ultrasonic frequency is too high and the attenuation is serious, which leads to the problem that the depth of the detection material is limited

However, this patent only provides a method for taking micro-samples of heat-resistant steel parts in use, and does not provide artificial comparison micro-samples that can evaluate the degree of performance degradation of heat-resistant steel parts; The non-linear ultrasonic detection grading and evaluation method of component performance degradation, but a quantitative analysis model that characterizes the relationship between the performance degradation parameters of heat-resistant steel components and the nonlinear ultrasonic coefficient is established by statistical methods

Due to the fact that there are very few studies on the performance degradation of heat-resistant steel based on nonlinear ultrasonic testing technology, and the statistical samples are not rich enough, although this method can be used to measure the nonlinear ultrasonic coefficient of the heat-resistant steel parts, it cannot Accurately grade and assess the degree of performance degradation based on existing data

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