Small punch testing device and method for deep sea hydrogen-induced stress cracking behavior

Abstract

The invention discloses a small punch testing device and method for the deep sea hydrogen-induced stress cracking behavior. A deep sea environment is simulated through a temperature control box and anitrogen charging oxygen removing reflux tank, and the flow state of deep sea water is simulated through the circulating flow of an electrolyte. Meanwhile, a deep sea hydrogen environment is simulatedby charging hydrogen online through an electrochemical workstation, and the deep sea static pressure is simulated by applying loads through a mechanical test machine and a small punch clamp. By changing the hydrogen charging current and the hydrogen charging time and investigating the mechanical properties of a metal sample in the deep sea simulation environment, the deterioration degree of a material in the deep sea environment is evaluated according to the fracture morphology, yield strength, strength limit and other information. The method can be used for studying the hydrogen-induced stress cracking behavior of the material during the service of a mechanical device in the deep sea environment and evaluating the degradation degree of the material in the deep sea environment, and can also provide an effective way for micro-damage detection of the service device in the deep sea environment.

Description

technical field [0001] The invention relates to the field of damage and degradation behavior of metal materials in a deep sea environment and a micro-damage detection method, in particular to a simulation test device and process for simulating hydrogen-induced stress cracking behavior of metal materials in service in a deep sea environment. Background technique [0002] With the rising demand for metal minerals, some high-quality mineral deposits on land are gradually depleted, and people have turned their attention to deep sea mining, especially when the ore produced on land is not easy to refine. There are three main forms of deep-sea mineral sources that people place high hopes on. One is the seabed heat source, which mainly comes from the cracks left by submarine volcanic activities; Natural precipitation; the third is the manganese nucleus containing a variety of metals with high application value. In order to develop and utilize these deep-sea mineral resources, it is...

AI Technical Summary

Problems solved by technology

At the same time, due to the presence of free hydrogen in the deep sea environment, hydrogen-induced cracking may occur in metal materials.

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