期刊
SCRIPTA MATERIALIA
卷 149, 期 -, 页码 79-83出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2018.02.025
关键词
Hydrogen embrittlement; Dual-phase steel; Martensite; Ferrite; Ab initio calculations
类别
资金
- NEDO
- JFE Steel Corporation
- Elements Strategy Initiative for Structural Materials (ESISM)
- National Science Foundation of China [U1760203]
- JSPS KAKENHI [JP16H06365, JP17H01238, JP17K18827]
- JST [20100113]
- Grants-in-Aid for Scientific Research [16H06365] Funding Source: KAKEN
Our first-principles calculations demonstrate that hydrogen is more stable in carbon supersaturated martensite than in a iron, due to the carbon-induced tetragonality in martensite lattice. The trapped hydrogen leads to remarkable decohesion between (110) planes both inside the martensite and along the martensite/ferrite interface, with the former being more significant than the latter. This decohesion can explain recent precise observations that in martensite/ferrite dual-phase steels the hydrogen-promoted crack was initiated in the martensite region and that in lath martensite steel it propagated not on lath boundaries but showed quasi-cleavage feature along (110) planes at very high hydrogen concentration. (C) 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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