Journal
SCRIPTA MATERIALIA
Volume 184, Issue -, Pages 12-18Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2020.03.036
Keywords
Bainitic steel; High cycle fatigue; Retained austenite; Fatigue crack initiation; Small crack
Categories
Funding
- National Natural Science Foundation of China [51771014, U1760104]
- Natural Science Foundation of Beijing Municipality [2172047]
- National Key Technologies Research and Development Program of China [2017YFB0304500]
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We describe here the distinct high cycle fatigue properties of advanced bainitic steels to elucidate the significant role of retained austenite with different morphologies on sub-surface fatigue crack initiation process. The inter-plate film-like retained austenite at the straight front of small crack tip transformed to martensite, leading to the arrest of small crack growth and altered the active slip systems. However, the blocky retained austenite or martensite/austenite islands located at prior austenite grain boundaries induced intergranular fatigue cracking because of ease of activation of slip in retained austenite. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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