Effects of high pressure hydrogen on materials failure studied By a new simple testing method.

发展了一种非常简单、安全的评价高压低温氢气环境中氢环境脆性的力学性能测试方法。在这种方法中，高压氢环境产生在样品中的孔内。用该试验方法研究了高能电子能对奥氏体不锈钢拉伸性能的影响，以及试件失效前氢气的运动情况。高能电子能随氢气压力和温度的降低而增加，但在190K以下下降，在低温下几乎消失，甚至在70 Mpa下也在120K以下。尽管假设氢在样品失效前会突然移动，但在样品失效之前没有检测到氢。通过计算机模拟的讨论，认为即使是α的b.c.c相，氢的浓度在样品确定之前就降低了。

A very simple and safe mechanical properties testing procedure to evaluate hydrogen environment embrittlement (HEE) in the environment of high pressure and low temperature hydrogen has been developed. In this method the high-pressure hydrogen environment is produced inside the hole in the specimen. With this testing method, effects of HEE on the tensile properties for austenitic stainless steels and movement of hydrogen gas just before the specimen failure were investigated.The effect of HEE increased with hydrogen pressure and the decrease of temperature, however, it decreased below 190K and almost disappeared at cryogenic temperatures, below 120K even in 70MPa. Although it was assumed that hydrogen would be moved abruptly just before the specimen failure, no hydrogen was detected before th failure. Through the discussion using computer simulation, it is considered that even aα'b.c.c. phase, concentration of hydrogen decreased before the specimensurfce.