The influence of internal hydrogen on the tensile properties of an equi-molar FeNiCoCrMn alloy results in a significant reduction of ductility, which is accompanied by a change in the fracture mode from ductile microvoid coalescence to intergranular failure. The introduction of 146.9 mass ppm of hydrogen reduced the plastic strain to failure from 0.67 in the uncharged case to 0.34 and 0.51 in hydrogen-charged specimens. The reduction in ductility and the transition in failure mode are clear indications that this alloy exhibits the classic signs of being susceptible to hydrogen embrittlement. The results are discussed in terms of the hydrogen-enhanced plasticity mechanism and its influence on hydrogen-induced intergranular failure. Furthermore, a new additional constraint that further promotes intergranular failure is introduced for the first time.

内部氢对等摩尔FeNiCoCrMn合金拉伸性能的影响导致延展性显着降低，并伴随着断裂模式从延展性微孔聚结到晶间破坏的变化。引入146.9质量ppm的氢气将塑性应变降低到破坏，从不带电的情况下为0.67降低到带氢的样品中的0.34和0.51。延展性的降低和失效模式的转变清楚地表明，这种合金表现出易受氢脆作用的经典迹象。从氢增强的可塑性机制及其对氢诱导的晶间破坏的影响方面讨论了结果。此外，首次引入了进一步促进晶间破坏的新附加约束。