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

本文提出了一种简便、安全的氢环境脆化（HEE）力学性能测试方法。在这种方法中，高压氢环境是在试样的孔内产生的。用该方法研究了HEE对奥氏体不锈钢拉伸性能和试样破坏前氢气运动的影响，发现HEE的影响随氢压和温度的降低而增大，但在190K以下减小，在低温下几乎消失，在120K以下甚至在70MPa下也基本消失。虽然假设氢在试样破坏前会突然移动，但在破坏前没有检测到氢。通过使用计算机模拟的讨论，可以认为即使是1000个b.c.c.相，氢的浓度降低之前，表面。

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.