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Achievement of high yield strength and strain hardening rate by forming fine ferrite and dislocation substructures in duplex lightweight steel

Title
Achievement of high yield strength and strain hardening rate by forming fine ferrite and dislocation substructures in duplex lightweight steel
Authors
Song, HyejinYoo, JisungSohn, Seok SuKoo, MinseoLee, Sunghak
POSTECH Authors
Lee, Sunghak
Date Issued
Sep-2017
Publisher
ELSEVIER SCIENCE SA
Abstract
Lightweight steels containing a considerable content of Al show high specific strength and ductility, but there are some drawbacks such as low yield strength and stringer-type bands formed along the rolling direction. Here we design new duplex lightweight steel in order to complement the drawbacks, and achieve ultra-high yield strength (865 MPa), good ductility (41%). Submicron ferrite mainly affects high yield-to-tensile ratio, and high strain hardening is attributed to Lomer-Cottrell lock and planar slip, and cell structure by further deformation in austenite. These results are expected to provide a desirable possibility for applications to reinforcement components requiring high yield-to-tensile ratio.
Keywords
TWINNING-INDUCED PLASTICITY; STACKING-FAULT ENERGY; LOW-DENSITY STEEL; AL-C STEEL; TENSILE PROPERTIES; MECHANICAL-PROPERTIES; DEFORMATION-BEHAVIOR; AUTOMOTIVE INDUSTRY; INDENTATION SIZE; TWIP STEELS
URI
http://oasis.postech.ac.kr/handle/2014.oak/50873
DOI
10.1016/j.msea.2017.08.030
ISSN
0921-5093
Article Type
Article
Citation
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, vol. 704, page. 287 - 291, 2017-09
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 LEE, SUNG HAK
Dept of Materials Science & Enginrg
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