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用双悬臂试样对充氢双相钢的延迟断裂特性进行了测试,结果表明:K_(1H)=560.13-160lnc。对加载试样在裂纹尖端前沿所形成的氢气泡的观察发现,氢是在靠近弹塑性边界的塑性区中富集着。裂纹主要是穿过铁素体和沿铁素体-马氏体小岛交界面扩展的,这说明了氢的富集主要是通过带氢位错的运动输送的。
The delayed fracture properties of hydrogenated duplex steel with double cantilever specimens were tested. The results show that K_ (1H) = 560.13-160lnc. Observations of hydrogen bubbles formed at the tip of the crack tip by loading the sample revealed that hydrogen is enriched in the plastic zone near the elastoplastic boundary. Cracks mainly extend through the ferrite and along the ferrite-martensite islands interface, indicating that hydrogen enrichment is mainly transported by hydrogen dislocation movement.