The role of microstructure was studied for dual-phase (DP), quenched and partitioned (Q&P), and twinning induced plasticity (TWIP) steels. The hydrogen influence changed the fracture mode at the ultimate tensile strength, there being no subcritical crack growth at a lower stress. The fractures initiated (i) in the hard martensite and/or at the interfaces of ferrite and martensite for DP steels, (ii) in the martensite and/or at the interfaces of retained austenite and martensite for Q&P steels, and (iii) at mechanical twins for TWIP steels. Tempering may improve the resistance to hydrogen of DP and Q&P steels.

中文翻译：

---

微观结构对氢对某些高级高强度钢影响的作用

研究了双相（DP），淬火和分配（Q＆P）和孪生感应塑性（TWIP）钢的微观结构。氢的影响在极限拉伸强度下改变了断裂方式，在较低的应力下没有亚临界裂纹的增长。裂纹在（i）DP钢的硬质马氏体和/或在铁素体和马氏体的界面处开始，（ii）在Q＆P钢的马氏体和/或在残余奥氏体和马氏体的界面处开始，以及（iii）在TWIP钢的机械双胞胎。回火可以提高DP和Q＆P钢的抗氢性能。