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Novel ferrite-austenite duplex lightweight steel with 77% ductility by transformation induced plasticity and twinning induced plasticity mechanisms

Authors
손석수
Issue Date
10월-2014
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Keywords
Annealing; Duplex lightweight steel; Tensile properties; Transformation induced plasticity (TRIP); Twinning induced plasticity (TWIP)
Citation
ACTA MATERIALIA, v.78, pp.181 - 189
Indexed
SCIE
SCOPUS
Journal Title
ACTA MATERIALIA
Volume
78
Start Page
181
End Page
189
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/139950
DOI
10.1016/j.actamat.2014.06.059
ISSN
1359-6454
Abstract
The need for lightweight materials has been an important issue in automotive industries to reduce greenhouse gas emission and to improve fuel efficiency. In addition, automotive steels require an excellent combination of strength and ductility to sustain automotive structures and to achieve complex shapes, but the traditional approach to obtain a reduction in weight from down-gauged steels with high strength has many limitations. Here, we present a new ferrite-austenite duplex lightweight steel containing a low-density element, Al; this steel exhibits tensile elongation up to 77% as well as high tensile strength (734 MPa). The enhanced properties are attributed to the simultaneous formation of deformation-induced martensites and deformation twins and the additional plasticity due to deformation twinning in austenite grains having optimal mechanical stability. The present work gives a promise for automotive applications requiring excellent properties as well as reduced specific weight. (C) 2014 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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Sohn, Seok Su
공과대학 (신소재공학부)
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