Achievement of high yield strength and strain hardening rate by forming fine ferrite and dislocation substructures in duplex lightweight steel
SCIE
SCOPUS
- Title
- Achievement of high yield strength and strain hardening rate by forming fine ferrite and dislocation substructures in duplex lightweight steel
- Authors
- Song, Hyejin; Yoo, Jisung; Sohn, Seok Su; Koo, Minseo; Lee, Sunghak
- Date Issued
- 2017-09
- 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
- https://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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