Journal
INTERNATIONAL JOURNAL OF FATIGUE
Volume 92, Issue -, Pages 203-210Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ijfatigue.2016.06.025
Keywords
Very high cycle fatigue; Retained austenite; Bainite; Quenching and partitioning; Crack initiation
Funding
- National Natural Science Foundation of China [51271013, 51301012]
- Fundamental Research Funds for the Central Universities [2015RC018]
- Central Iron & Steel Research Institute
- Overseas Fellows Program of Beijing Jiaotong University
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A bainite/martensite (B/M) multiphase steel was treated by a novel bainite-based Q-P-T treatment with various process parameters to obtain multiphase microstructure composed of bainite, martensite and different types of retained austenite (nanometer-sized film-like and micrometer-sized blocky retained austenite). We investigate here the effect of retained austenite on the very high cycle fatigue (VHCF) behavior, especially the fatigue crack initiation in VHCF regime. Results show that the non-inclusion induced crack initiation is the main fatigue failure mechanism in the B/M steel with blocky retained austenite. The blocky retained austenite transforms easily to martensite due to local plastic deformation under cyclic loading, which is prone to induce the formation of micro-cracks. In contrast, the film-like retained austenite is beneficial to the VHCF property of B/M steel due to the dislocation absorption and transformation induced plasticity effects. Therefore, the B/M steel with film-like retained austenite exhibits excellent VHCF property, namely, the fatigue limit in VHCF regime reaches 770 MPa while the tensile strength is 1410 MPa. (C) 2016 Elsevier Ltd. All rights reserved.
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