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  Enhanced strain hardening capacity in a lean alloy steel treated by a "disturbed" bainitic austempering process

Gao, G., Zhang, H., Gui, X., Tan, Z., Bai, B., & Weng, Y. (2015). Enhanced strain hardening capacity in a lean alloy steel treated by a "disturbed" bainitic austempering process. Acta Materialia, 101, 31-39. doi:10.1016/j.actamat.2015.08.071.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0001-BAD4-E Version Permalink: http://hdl.handle.net/21.11116/0000-0001-BAD5-D
Genre: Journal Article

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 Creators:
Gao, Guhui1, Author              
Zhang, Han2, 3, Author              
Gui, Xiaolu1, Author              
Tan, Zhunli1, Author              
Bai, Bingzhe1, 4, Author              
Weng, Yuqing5, 6, Author              
Affiliations:
1Materials Science and Engineering Research Center, Beijing Jiaotong University, Beijing, China, ou_persistent22              
2Material Science & Engineering Research Center, School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing, China, persistent22              
3Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863381              
4Key Laboratory of Advanced Materials, Department of Material Science and Engineering, Tsinghua University, Beijing, China, ou_persistent22              
5Beijing Jiaotong University, Mat. Sci. and Eng. Res. Center, Beijing, China, persistent22              
6Tsinghua University, Key Lab. Adv. Mat., Sch. Mat. Sci. and Eng., Beijing, China, persistent22              

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Free keywords: Alloy steel; Austenite; Bainite; Hardening; Manganese; Martensitic steel; Mechanical properties; Plasticity; Quenching; Strain hardening, Austempering process; Low alloyed steels; Quenching and partitioning; Retained austenite; Strain-hardening capacity; Strength and ductilities; Transformation induced plasticity; Twinning-induced plasticities, Bainitic transformations
 Abstract: A "disturbed" bainitic austempering process (isothermal bainitic transformation in conjunction with quenching and partitioning) was employed in a Mn-Si-Cr-C low-alloyed steel to reduce the fraction and size of the blocky martensite/austenite (M/A) islands. The M/A islands formed during the conventional bainitic austempering process are coarse and undesirable for property optimization. Owing to the novel heat treatment, the strain hardening capacity of the steel is improved remarkably, leading to an excellent combination of strength and ductility (e.g. ultimate strength: 1515 MPa; total elongation: 31.2). The improvement of mechanical properties is attributed to both the transformation induced plasticity (TRIP) and twinning induced plasticity (TWIP) effects provided by the refined filmy austenite constituent. © 2015 Acta Materialia Inc.

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Language(s): eng - English
 Dates: 2015-12-01
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1016/j.actamat.2015.08.071
BibTex Citekey: Gao201531
 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: 101 Sequence Number: - Start / End Page: 31 - 39 Identifier: ISSN: 1359-6454
CoNE: /journals/resource/954928603100