Method for detecting hydrogen damage of material through ultrasonic axial guided wave sound velocity

Abstract

The invention discloses a method for detecting hydrogen damage of a material through ultrasonic axial guided wave sound velocity. The method comprises the following steps: manufacturing a group of original reference blocks, carrying out a hydrogen permeation test on the original reference blocks, manufacturing an axial hydrogen damage reference block group, erecting an ultrasonic axial guided wave sound velocity detection system, testing the axial guided wave sound velocity of the axial hydrogen damage reference block group, measuring the average hydrogen concentration, drawing an axial guided wave sound velocity-average hydrogen concentration reference curve, and detecting the hydrogen damage degree of the in-service to-be-detected hydrogen equipment. According to the method, the corresponding relation between the axial guided wave sound velocity change and the material hydrogen damage degree is found out, a material axial guided wave sound velocity-material average hydrogen concentration reference curve is drawn, and then the hydrogen damage condition of chemical oil refining hydrogenation and hydrogen-contacting equipment which is small in in-service inner diameter and cannot enter or stop is evaluated. According to the method, the detection process is low in cost, the detected in-service hydrogen-contacting equipment does not need to be shut down, and the method has a very positive effect on hydrogen damage monitoring of the in-service chemical oil refining hydrogen-contacting equipment.

Description

technical field [0001] The invention relates to the technical field of non-destructive flaw detection of metal materials, in particular to a method for detecting hydrogen damage of metal materials through ultrasonic guided waves, in particular to a method for detecting hydrogen damage of materials through changes in the sound velocity of ultrasonic axial guided waves. Background technique [0002] Hydrogen damage to metals includes hydrogen embrittlement, hydrogen bubbling, and hydrogen-induced cracking. Among them, hydrogen embrittlement can be recovered, while hydrogen bubbling and hydrogen-induced cracking are permanent. It is very important to evaluate the degree of hydrogen damage. At present, the method of evaluating the degree of hydrogen damage of metal materials usually adopts the method of testing the mechanical properties of materials. Since this method is destructive, it cannot be used to detect in-service equipment. [0003] The existing non-destructive testing...

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Problems solved by technology

Therefore, if ultrasonic surface waves are used to detect the degree of hydrogen damage on the inner wall of the material, it should be detected on the inner wall of the equipment, which cannot be tested for some equipment with a small inner diameter, which cannot be entered or cannot be shut down.

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