A constant stress loading hydrogen permeation test device and test method

Abstract

The invention provides a hydrogen permeation experimental device under constant stress loading, which includes a mechanical stress loading mechanism and a hydrogen permeation reaction mechanism. The mechanical stress loading mechanism includes a force applying mechanism, a spring, a passive slider and a force compensation mechanism. And the specimen stretching rack, the force applying mechanism can generate tension on the spring to deform the spring, and the spring can generate tension on the specimen stretching rack to realize the stretching of the specimen. After stretching, the length of the specimen changes, and the length of the spring Also changes, causing the spring to produce partial loss to the tensile force of the test piece, and the force compensation mechanism can compensate the lost force to ensure the constant force loading of the test piece; method. According to the small deformation of the test piece, the invention compensates through the force compensation mechanism to ensure constant load. The device has strong applicability to metal material stretching, simple device, accurate measurement, low cost, and easy to realize creep under constant force. Real-time monitoring of stress and displacement.

Description

technical field [0001] The invention belongs to the technical field of metal material performance testing, and in particular relates to a hydrogen permeation experiment device under constant stress loading. Background technique [0002] With the wide application of metal materials, the performance of metal materials has become very important, especially the use of steel is more prominent in marine engineering. Due to the particularity of seawater, it is easy to cause hydrogen embrittlement of steel. Hydrogen embrittlement refers to Since hydrogen penetrates into the metal in an atomic state, and then combines into molecules inside the metal to generate high pressure, which will cause the surface to bulge or wrinkle in severe cases, thereby losing the superior performance of the steel. Therefore, the factors affecting the hydrogen permeation phenomenon The research is of great significance to the mechanism of hydrogen permeation and safety protection. [0003] At present, mo...

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Problems solved by technology

[0003] At present, most hydrogen permeation tests use the electrochemical permeation method to measure the diffusion behavior of hydrogen in the metal structure. The electrochemical hydrogen charging method can obtain a hydrogen concentration that is harsher than the actual working conditions, and can better simulate the shutdown state of the reactor. And the test The device is relatively simple, so this method is more suitable for the research on hydrogen embrittlement of materials in a multi-field coupling environment. The hydrogen permeation curve is measured. In addition, it is difficult to connect the external stress mechanism and the electrolytic cell. The existing equipment is difficult to achieve a good cooperation between slow stretching and electrochemical corrosion equipment, and the types of samples that can be selected are limited.

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