氢诱导奥氏体钢的ε马氏体转变及断裂机理研究

Study of fracture mechanism and martensite induced by Hydrogen in austenite steels

用慢拉伸试验方法,考察了两种不同组织稳定性奥氏体钢充氢后的塑性变化,并用扫描电镜观察其断口形貌,结合充氢前后组织的变化,分析奥氏体钢产生氢脆的组织因素及断裂方式.分析说明,充氢后,层错能较低的奥氏体钢在外力作用下,有较多的ε马氏体产生,且断裂正是沿γ/ε相界发生的.

The ductility of two austen-ite steels with various stabilities in hydrogen charged or not charged has been investigated by slow tensile test. The morphology of fracture surface has been ob-served from SEM and the marstenite transformation in the steels has been determined by means of X -ray diffraction. It is shown that more ε- martensite is formed in No. 18 steel with low stacking fault energy after hydrogen charged and the crack forms and propagates along the γ/ε interface.