The effects of carbon and nitrogen on hydrogen embrittlement were investigated in stable austenitic stainless steels, Fe-15Cr-15Mn-4Ni-0.3Si with 0.3C or 0.3N (wt.%). The steels were electro-chemically charged under two different conditions and tensile tested at a slow strain rate. Hydrogen degraded the tensile properties in both alloys via different mechanisms. Hydrogen severely weakened the grain boundary strength of the nitrogen-added steel, resulting in early intergranular fracture. Carbon segregation increased the boundary strength, which reduced the extent of hydrogen embrittlement. Moreover, the degree of hydrogen-induced degradation was dependent on the depth of hydrogen penetration. Since the brittle fracture occurred only in the regions penetrated by hydrogen, the embrittlement ratio was not a good criterion to assess the susceptibility of the two steels to hydrogen embrittlement.

中文翻译：

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碳氮对15Cr-15Mn-4Ni基稳定奥氏体不锈钢氢脆的影响

在稳定的奥氏体不锈钢 Fe-15Cr-15Mn-4Ni-0.3Si 和 0.3C 或 0.3N (wt.%) 中研究了碳和氮对氢脆的影响。钢在两种不同的条件下进行电化学充电，并在慢应变速率下进行拉伸测试。氢通过不同的机制降低了两种合金的拉伸性能。氢严重削弱了加氮钢的晶界强度，导致早期晶间断裂。碳偏析增加了边界强度，从而降低了氢脆的程度。此外，氢诱导降解的程度取决于氢渗透的深度。由于脆性断裂仅发生在氢渗透的区域，