原位充氢-拉伸载荷作用下304不锈钢氢脆行为及显微组织表征

Hydrogen Embrittlement Behavior and Microstructure Characterization of 304 Stainless Steel under in-situ Hydrogen Charging-tensile Loading

搭建了原位电化学充氢—慢应变速率拉伸载荷平台,模拟真实临氢环境—载荷环境,研究了原位充氢对304奥氏体不锈钢氢脆敏感性的影响。结果表明:相比传统预充氢拉伸实验,304奥氏体不锈钢经原位电化学充氢拉伸后呈现较低的强度和更高的氢脆敏感性,未发生明显马氏体相变;试样在变形早期即发生严重氢致断裂,对实际临氢环境服役条件下不锈钢氢脆行为研究和应用具有参考价值。

In order to simulate the real hydrogen-load environmet,an in-situ electrochemical hydrogen charging slow strain rate tensile is designed to simulate the real hydrogen load environment,and the effect of in-situ and pre-hydrogen charging on the hydrogen embrittlement sensitivity of 304 austenitic stainless steel is studied.The results show that 304 austenitic stainless steel exhibits lower strength and higher hydrogen embrittlement sensitivity after in-situ electrochemical hydrogen charging tensile test compared with the pre-hydrogen charging tensile test,and no obvious Martensite transformation occurs.The sample has serious hydrogen induced fracture at the early stage of deformation,which is of great significance for understanding the hydrogen embrittlement behavior of stainless steel in a real hydrogen load environment.