期刊
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
卷 101, 期 -, 页码 44-62出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jmps.2016.12.010
关键词
Tempered martensite ferritic steels; Strain gradient-based crystal plasticity; Cyclic softening fatigue; Finite element; Crack initiation
资金
- Science Foundation Ireland [SFI/10/1N.1/13015, SFI/14/1A/2604]
- Shenzhen Municipal Science and Technology Innovation Council [JCYJ20160608161000821]
- Irish Center for High-End Computing (ICHEC)
- National Supercomputer Center in Guangzhou, China
In this paper, a multi-scale crystal plasticity model is presented for cyclic plasticity and low-cycle fatigue in a tempered martensite ferritic steel at elevated temperature. The model explicitly represents the geometry of grains, sub-grains and precipitates in the material, with strain gradient effects and kinematic hardening included in the crystal plasticity formulation. With the multiscale model, the cyclic behaviour at the sub-grain level is predicted with the effect of lath and precipitate sizes examined. A crystallographic, accumulated slip (strain) parameter, modulated by triaxiality, is implemented at the micro scale, to predict crack initiation in precipitate-strengthened laths. The predicted numbers of cycles to crack initiation agree well with experimental data. A strong dependence on the precipitate size is demonstrated, indicating a detrimental effect of coarsening of precipitates on fatigue at elevated temperature. (C) 2016 Elsevier Ltd. All rights reserved.
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