Given the high strength of multiphase stainless steel, it is imperative to study its hydrogen embrittlement behavior. However, the understanding of hydrogen-assisted crack initiation and propagation is limited. In this study, we investigate the hydrogen-assisted cracking behavior of multiphase stainless steel through crack analysis, hydrogen permeation test, and hydrogen desorption experiments. Our findings reveal that hydrogen-assisted cracks initiate at the martensite packet boundaries and propagate along the packet boundaries, block boundaries, prior austenite grain boundaries and through ferrite. Additionally, we have elucidated the hydrogen trap sources and proposed a hydrogen-assisted cracking mechanism.

中文翻译：

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更好地理解多相不锈钢的氢辅助开裂

鉴于多相不锈钢的高强度，有必要研究其氢脆行为。然而，对氢辅助裂纹萌生和扩展的理解是有限的。在本研究中，我们通过裂纹分析、氢渗透测试和氢解吸实验研究了多相不锈钢的氢辅助开裂行为。我们的研究结果表明，氢辅助裂纹始于马氏体包边界，并沿着包边界、块边界、原奥氏体晶界并穿过铁素体扩展。此外，我们还阐明了氢陷阱来源并提出了氢辅助裂解机制。