Method for preparing simulated stress corrosion crack with controllable crack size and conductivity

Abstract

Provided is a method for preparing a simulated stress corrosion crack with the controllable crack size and conductivity. The method comprises the steps that firstly, two stainless steel test blocks are machined, and a pit flaw with a certain size and shape is pre-buried in a to-be-welded face of one test block according to the size of a real stress corrosion crack; then the pre-buried pit is filled with a selected high temperature resisting material with proper conductivity according to the conductivity of the real crack, and the two test blocks are welded together through the solid phase welding technology to obtain a welded test piece; the part, above the pre-buried flaw area, of the welded test piece is cut out, the machined surface flaw test piece can be used for eddy current testing experiments, and the real stress corrosion crack is simulated. The simulated test piece prepared through the method can effectively replace a stress corrosion crack test piece complex in actual shape and hard to prepare, the advantages of being easy to operate and achieve, low in cost and controllable in crack size and conductivity are achieved, and the test piece can be widely applied to a detectability certification system of a stress corrosion crack quantitative eddy current testing method.

Description

technical field [0001] The invention relates to the field of preparation of stress corrosion crack simulation test pieces, in particular to a preparation method of simulated stress corrosion cracks which can control the crack size and electrical conductivity. Background technique [0002] Austenitic stainless steel materials sensitive to stress corrosion are widely used in nuclear power plants, and the existence of tensile stress and corrosive environment in nuclear power structures makes stress corrosion cracks widely exist in key parts of nuclear power plants, such as heat exchange tube sheets of steam generators Expansion part, welding part of main cooling tube platform, etc. The existence of stress corrosion cracks poses a huge threat to the safe operation of nuclear power structures, and considering economic benefits, it is necessary to evaluate the size of cracks, so the quantitative nondestructive testing of stress corrosion cracks is extremely important. At present,...

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Problems solved by technology

[0004] In order to solve the above-mentioned existing artificial stress corrosion crack test piece preparation difficulties, the size of the prepared crack and the uncontrollable electrical conductivity of the crack area, the object of the present invention is to provide a simulated stress corrosion cracking that can control the crack size and electrical conductivity The preparation method can regulate the crack size and electrical conductivity and simulate and replace the stress corrosion cracked specimen in the sense of eddy current detection. This method has the advantages of simple operation, easy implementation, low cost, and known simulated crack size and electrical conductivity. It can be widely used in the certification system of stress corrosion crack quantitative non-destructive testing capability

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