Abstract An in situ silver decoration technique was applied to investigate the effect of microstructure on hydrogen flux in an austenite/α′-martensite dual-phase Fe-32Ni-0.2C alloy. Using time-resolved hydrogen mapping, the surface orientation of the body-centered cubic lenticular martensite was found to have a significant effect on hydrogen flux. The hydrogen flux was particularly high at the near-〈0 0 1〉, while it was the lowest at the near-〈1 1 1〉 surface. This dependence of hydrogen flux on the surface orientation is attributed to hydrogen trapping at dislocations in the martensite. Particularly, 〈1 1 1〉 twinning-shear in the martensite enhances hydrogen trapping at dislocations, suppressing hydrogen diffusion in the shortest path of grains orientated to 〈1 1 1〉.

中文翻译：

---

原位银装饰技术阐明Fe-Ni-C合金透镜状马氏体中氢通量的表面取向依赖性

摘要 采用原位银装饰技术研究了微观结构对奥氏体/α'-马氏体双相Fe-32Ni-0.2C合金中氢通量的影响。使用时间分辨氢映射，发现体心立方透镜状马氏体的表面取向对氢通量有显着影响。氢通量在近<0 0 1>表面特别高，而在近<1 1 1>表面最低。氢通量对表面取向的这种依赖性归因于马氏体中位错处的氢俘获。特别是，马氏体中的<1 1 1>孪晶剪切增强了位错处的氢俘获，抑制了取向为<1 1 1>的晶粒最短路径中的氢扩散。