期刊
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
卷 112, 期 -, 页码 403-430出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jmps.2017.12.016
关键词
Hydrogen embrittlement; Martensitic steels; Plasticity; Decohesion; Weakest link statistics
资金
- JFE Steel Corporation
- International Institute for Carbon-Neutral Energy Research (WPI-I2CNER) - World Premier International Research Center Initiative (WPI), MEXT, Japan
- Mechanical Behavior of Materials Program (KC13) at the Lawrence Berkeley National Laboratory (LBNL) - Office of Science, Office of Basic Energy Sciences, Materials Sciences Division of the U.S. Department of Energy [DE-AC02-05CH11231]
Hydrogen embrittlement of lath martenistic steels is characterized by intergranular and quasi-cleavage transgranular fracture. Recent transmission electron microscopy (TEM) analyses (Nagao et al., 2012a, 2014a, 2014b, 2014c) of samples lifted from beneath fracture surfaces through focused ion beam machining (FIB) revealed a failure mechanism that can be termed hydrogen-enhanced-plasticity mediated decohesion. Fracture occurs by the synergistic action of the hydrogen-enhanced localized plasticity and decohesion. In particular, intergranular cracking takes place by dislocation pile-ups impinging on prior austenite grain boundaries and quasi-cleavage is the case when dislocation pile-ups impinge on block boundaries. These high-angle boundaries, which have already weakened by the presence of hydrogen, debond by the pile-up stresses. The micromechanical model of Novak et al. (2010) is used to quantitatively describe and predict the hydrogen-induced failure of these steels. The model predictions verify that introduction of nanosized (Ti,Mo)C precipitates in the steel microstructure enhances the resistance to hydrogen embrittlement. The results are used to discuss microstructural designs that are less susceptible to hydrogen induced failure in systems with fixed hydrogen content (closed systems). Published by Elsevier Ltd.
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