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  Enhanced ductility and toughness in an ultrahigh-strength Mn–Si–Cr–C steel: The great potential of ultrafine filmy retained austenite

Gao, G., Zhang, H., Gui, X., Luo, P., Tan, Z., & Bai, B. (2014). Enhanced ductility and toughness in an ultrahigh-strength Mn–Si–Cr–C steel: The great potential of ultrafine filmy retained austenite. Acta Materialia, 76, 425-433. doi:10.1016/j.actamat.2014.05.055.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0001-BFC2-D Version Permalink: http://hdl.handle.net/21.11116/0000-0001-BFC3-C
Genre: Journal Article

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 Creators:
Gao, Guhui1, Author              
Zhang, Han2, Author              
Gui, Xiaolu1, Author              
Luo, Ping3, Author              
Tan, Zhunli1, Author              
Bai, Bingzhe1, 4, Author              
Affiliations:
1Materials Science and Engineering Research Center, Beijing Jiaotong University, Beijing, China, ou_persistent22              
2Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863381              
3Material Science & Engineering Research Center, School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing 100044, China, persistent22              
4Key Laboratory of Advanced Materials, Department of Material Science and Engineering, Tsinghua University, Beijing, China, ou_persistent22              

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Free keywords: Ductility; Manganese; Quenching; Scanning electron microscopy; Silicon; Tensile strength; Toughness; Transmission electron microscopy; X ray diffraction, Bainitic microstructures; Electron back scatter diffraction; Enhanced ductility; Optimum combination; Quenching and partitioning; Retained austenite; Total elongations; Ultimate tensile strength, Bainite
 Abstract: Three heat-treatment routes incorporating bainite formation, namely bainite-based quenching plus tempering, bainite austempering and bainite-based quenching plus partitioning (BQamp;P), were applied to a medium-carbon Mn-Si-Cr alloyed steel. An optimum combination of strength, ductility and toughness was achieved after the BQamp;P treatment (ultimate tensile strength: 1688 MPa; total elongation: 25.2; U-notch impact toughness at -40 °C: 48 J cm -2). The enhanced mechanical properties were attributed to an increased amount of refined filmy retained austenite (22 vol., nanometer width range: lt;100 nm and submicron width range: 100-500 nm). The formation process of the bainitic microstructure as well as martensite and retained austenite was revealed by conducting dilatometry, X-ray diffraction, scanning electron microscopy, electron backscatter diffraction and transmission electron microscopy (TEM). The effect of the retained austenite on mechanical properties was discussed in terms of its size and morphology. © 2014 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

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Language(s): eng - English
 Dates: 2014-09-01
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1016/j.actamat.2014.05.055
BibTex Citekey: Gao2014425
 Degree: -

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Title: Acta Materialia
  Abbreviation : Acta Mater.
Source Genre: Journal
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Publ. Info: Kidlington : Elsevier Science
Pages: - Volume / Issue: 76 Sequence Number: - Start / End Page: 425 - 433 Identifier: ISSN: 1359-6454
CoNE: https://pure.mpg.de/cone/journals/resource/954928603100