J
Jai Hyun Kwak
Researcher at POSCO
Publications - 12
Citations - 664
Jai Hyun Kwak is an academic researcher from POSCO. The author has contributed to research in topics: Austenite & Annealing (metallurgy). The author has an hindex of 11, co-authored 12 publications receiving 490 citations.
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Journal ArticleDOI
Effect of aging on the microstructure and deformation behavior of austenite base lightweight Fe-28Mn-9Al-0.8C steel
Kayoung Choi,Chang-Hyo Seo,Hak-Cheol Lee,S.K. Kim,Jai Hyun Kwak,Kwang Geun Chin,Kyung-Tae Park,Nack J. Kim +7 more
TL;DR: The effect of aging on the deformation behavior of austenitic Fe-28Mn-9Al-0.8C steel has been investigated in this paper, where various aging conditions were used to alter the size and volume fraction of κ-carbide precipitates.
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Novel ferrite-austenite duplex lightweight steel with 77% ductility by transformation induced plasticity and twinning induced plasticity mechanisms
TL;DR: In this paper, a new ferrite-austenite duplex lightweight steel containing a low-density element, Al, was presented, which exhibits tensile elongation up to 77% as well as high tensile strength (734 MPa).
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Novel ultra-high-strength (ferrite + austenite) duplex lightweight steels achieved by fine dislocation substructures (Taylor lattices), grain refinement, and partial recrystallization
Seok Su Sohn,Hyejin Song,Byeong-Chan Suh,Jai Hyun Kwak,Byeong-Joo Lee,Nack J. Kim,Sunghak Lee +6 more
TL;DR: In this paper, a new ultra-high-strength (ferrite+austenite) duplex lightweight steels containing a low-density element of Al, which exhibit strength above 1 GPa and tensile elongation of 46%, have been developed.
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Effect of Austenite Stability on Microstructural Evolution and Tensile Properties in Intercritically Annealed Medium-Mn Lightweight Steels
TL;DR: In this paper, the microstructural evolution with varying intercriticalannealing temperatures of medium-Mn duplex lightweight steels and its effects on tensile properties were investigated in relation to the stability of austenite.
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Dramatic improvement of strain hardening and ductility to 95% in highly-deformable high-strength duplex lightweight steels.
TL;DR: A newly designed Fe-0.3C-9Mn-5Al steel is presented to obtain an optimal level of stability of austenite and a resultant outstanding combination of tensile strength and ductility, e.g., 874 MPa and 72%, together with sufficiently high strain hardening.