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Effect of hydrogen on tensile properties and fracture behavior of PH 13-8 Mo steel

2016; Elsevier BV; Volume: 108; Linguagem: Inglês

10.1016/j.matdes.2016.06.110

1873-4197

Xinfeng Li, Jin Zhang, Yanfei Wang, Sicong Shen, Xiaolong Song,

Nuclear Materials and Properties

The tensile properties and fracture behavior of PH 13-8 Mo steel after subjected to pre-charged hydrogen were investigated by slow strain rate tensile tests. The results suggest that hydrogen slightly increases yield strength, while decreases tensile strength. The susceptibility to hydrogen embrittlement of specimens aged at 650 °C firstly reduces and then increases as the aging time increases, reaching the lowest value at aging time 4 h. This is dominantly attributed to the highest content of austenite. Moreover, hydrogen-induced crack nucleation sites initiate from lath, packet and prior austenite grain boundaries. Crack propagation passes through lath boundaries and walks along packet, prior austenite grain boundaries. Scanning electron microscopy result indicates that hydrogen-charged specimens show quasi-cleavage fracture and intergranular fracture in annular brittle zone while dimple fracture is observed in hydrogen-free specimens.