通过测量拉伸性能、TEM和SEM分析研究了YB70钢的氢致韧性损伤。结果表明，YB70钢拉伸试样充氢2h以上，其韧性损伤超过80%。在充氢拉伸试样的断口上观察到沿滑移面扩展的穿晶裂纹；基体和碳化物界面处的氢偏聚，使拉伸变形中在距界面约15nm处形成高密度位错缠结，裂纹在位错缠结处形核并沿滑移面扩展，导致了YB70钢的韧性损伤。
Hydrogen-induce ductility loss in YB70 steel was investigated by measurements of tensile properties as well as TEM and SEM analyses of deformation and fracture. The result shows that the hydrogen-induce ductility loss in YB70 steel exceeds 80% when tensile specimens were hydrogen-charged for more than 2h. Some transgranular cracking along slip planes can be observed on the tensile fracture surface of specimens hydrogen-charged. Hydrogen segregation near the interface between the matrix and carbide precipitates promotes the dislocation movement in tensile deformation, leading to a high density of tangled dislocations to be located at approximately 15nm from the interface. The cracking is formed at the position with the high density of tangled dislocations and propagated along slip planes, which results in the ductility loss of YB70 steel.
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