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  Very high cycle fatigue behaviors of bainite/martensite multiphase steel treated by quenching-partitioning-tempering process

Gao, G., Zhang, B., Cheng, C., Zhao, P., Zhang, H., & Bai, B. (2016). Very high cycle fatigue behaviors of bainite/martensite multiphase steel treated by quenching-partitioning-tempering process. International Journal of Fatigue, 92, 203-210. doi:10.1016/j.ijfatigue.2016.06.025.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0001-B239-6 Version Permalink: http://hdl.handle.net/21.11116/0000-0001-B23A-5
Genre: Journal Article

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 Creators:
Gao, Guhui1, Author              
Zhang, Baoxiang2, Author              
Cheng, Cheng3, Author              
Zhao, Ping4, Author              
Zhang, Han3, 5, Author              
Bai, Bingzhe1, 6, Author              
Affiliations:
1Materials Science and Engineering Research Center, Beijing Jiaotong University, Beijing, China, ou_persistent22              
2Beijing General Research Institute of Nonferrous Metals, GRIKIN Adv Mat Co. Limited, Beijing, China, persistent22              
3Material Science & Engineering Research Center, School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing, China, persistent22              
4Tsinghua University, Key Laboratory of Advanced Material, School of Material Science and Engineering, Beijing, China, persistent22              
5Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863381              
6Key Laboratory of Advanced Materials, Department of Material Science and Engineering, Tsinghua University, Beijing, China, ou_persistent22              

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Free keywords: Austenite; Bainite; Bainitic transformations; Crack initiation; Cracks; Failure (mechanical); Martensite; Martensitic steel; Quenching; Tensile strength, Fatigue crack initiation; Local plastic deformation; Multiphase microstructure; Quenching and partitioning; Quenching-partitioning-tempering; Retained austenite; Transformation induced plasticity; Very high cycle fatigue, Fatigue of materials
 Abstract: 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. © 2016 Elsevier Ltd

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Language(s): eng - English
 Dates: 2016-11-01
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1016/j.ijfatigue.2016.06.025
BibTex Citekey: Gao2016203
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Title: International Journal of Fatigue
  Other : Int. J. Fatigue
Source Genre: Journal
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Publ. Info: Guildford, England : Elsevier
Pages: - Volume / Issue: 92 Sequence Number: - Start / End Page: 203 - 210 Identifier: ISSN: 0142-1123
CoNE: /journals/resource/954925471357