Constant stress loaded hydrogen permeation experimental device and test method

Abstract

The invention provides a constant stress loaded hydrogen permeation experimental device. The experimental device comprises a mechanical stress loading mechanism and a hydrogen permeation reaction mechanism; the mechanical stress loading mechanism comprises a force application mechanism, a spring, a passive sliding block and a force supplementing mechanism; the hydrogen permeation reaction mechanism comprises a test piece and a test piece stretching frame; the force application mechanism can produce tensile force on the spring so that the spring is deformed; the spring produces tensile force for the test piece stretching frame so as to realize the stretching of the test piece; the length is changed after the test piece is stretched, and the length of the spring is also changed, thereby causing a condition that the tensile force on the test piece by the spring is partially lost; the force supplementing mechanism can compensate the lost force so as to guarantee the constant force loadingof the test piece. The invention further provides a test method of the constant stress loaded hydrogen permeation experimental device. The compensation is performed through the force supplementing mechanism according to the tiny deformation of the test piece, thereby guaranteeing the constant load; and the device disclosed by the invention has strong applicability for the metal material stretching, is simple, accurate in measurement, low in cost, and capable of easily realizing the real-time monitoring on the creep stress and displacement under the constant force.

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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