期刊
MATERIALS LETTERS
卷 234, 期 -, 页码 175-178出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.matlet.2018.09.087
关键词
Hydrogen; Atomic force microscopy; Metals and alloys; Twin boundary
资金
- National Natural Science Foundation of China [51805471]
- China Postdoctoral Science Foundation [2018M632457]
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.
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