Hydrogen distribution at twin boundary in austenitic stainless steel studied by scanning Kelvin probe force microscopy
Hydrogen distribution at twin boundary in austenitic stainless steel studied by scanning Kelvin probe force microscopy
复制标题
通过扫描开尔文探针力显微镜研究奥氏体不锈钢孪晶边界的氢分布
DOI：
10.1016/j.matlet.2018.09.087
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发表时间：
2019-01-01
影响因子：
3
通讯作者：
Zhu, Shengyi
中科院分区：
文献类型：
--
作者：
Hua, Zhengli;Wang, Dongliang;Zhu, Shengyi
在氢的作用下，奥氏体不锈钢(γ-SS)断口常出现孪晶界(Tb)分离现象。然而，以前的研究在确定结核的氢分布和扩散行为方面做得不够。用扫描开尔文探针力显微镜(SKPFM)研究了热氢预充的γ-SS中Tb处的氢分布。结果表明，材料中存在大量的TBS马氏体(α‘)。带有α‘的Tb为氢的扩散提供了快速通道，一些氢被捕获在这些区域，这被认为是Tb分离的原因之一。相反，在没有α‘的TBS中没有发现明显的氢扩散加速和氢俘获。(C)2018爱思唯尔B.V.保留所有权利。
Twin boundary (TB) separation is usually observed on the fracture surface of austenitic stainless steels (gamma-SS) under the influence of hydrogen. However, previous studies fell short in determining the hydrogen distribution and diffusion behavior at the TB. Scanning Kelvin probe force microscopy (SKPFM) is used to investigate the hydrogen distribution at TB in thermally hydrogen-precharged gamma-SS. It is found that there are many martensite (alpha') at TBs in the material. TBs with alpha' provide fast paths for hydrogen diffusion and some hydrogen is trapped at these areas, which is proposed to be one of the reasons for the TB separation. In contrast, no clear acceleration of hydrogen diffusion and trapping of hydrogen are found at TBs without alpha'. (C) 2018 Elsevier B.V. All rights reserved.