Elucidation of the hydrogen embrittlement by means of in-situ monitoring of hydrogen and damage of hydrogen-related materials

为了阐明脆性断裂的顺序，研制了一种能够检测脆性断裂过程中氢气析出的新型监测系统。该系统由超高真空室、拉伸试验机、质谱仪和高速显微镜组成。结果表明，在晶间断口处有氢释放，这是由于试验环境对氢的吸收所致。结果表明，随应变速率的变化，SCM 435钢的断口表面同时释放氢原子或氢分子。

A novel monitoring system which is able to detect hydrogen gas evolution during the brittle facture was made to elucidate the sequence of brittle fracture. The system is composed of an ultrahigh vacuum chamber, tensile testing machine, mass spectrometers, and high speed microscope. It was revealed that hydrogen was released at the intergranular fracture surface, which is due to the absorption of hydrogen from the testing environment. It was also shown that atomic or molecular hydrogen were both released from the fracture surface of SCM 435 steels depending on the testing strain rate.