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논문 기본 정보

자료유형
학술저널
저자정보
Bongyoon Kim (Hanyang University) Seonghoon Jeong (Hanyang University) Seong‑Jun Park (Korea Institute of Materials Science) Joonoh Moon (Korea Institute of Materials Science) Changhee Lee (Hanyang University)
저널정보
대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.25 No.4
발행연도
2019.1
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1,019 - 1,026 (8page)

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In the automotive industry, lightweight steel has received much attention because steel comprises a signifi cant portion of avehicle’s total weight. Fe–Mn–Al–C steel is a representative lightweight steel due to its high performance and low density. However, there is insuffi cient research into the welding characteristics of Fe–Mn–Al–C lightweight steels. In this study, hotductility tests were conducted on austenitic Fe–30Mn–9Al–0.9C steel in order to understand the welding characteristics(cracking resistance) of the heat aff ected zone. During the on-heating thermal cycle, ductility was altered by a decrease inmicroband induced plasticity (MBIP) (softening) and an increase in dynamic recrystallization (DRX) (softening) as the temperatureincreased. Specifi cally, in the range of 773–1073 K, ductility was fairly degraded because neither MBIP nor DRXtook place. During the on-cooling thermal cycle, ductility behavior was changed by both softening and hardening factors,including formation of brittle (Fe, Mn) 3 Al intermetallic compounds with grain growth and re-solidifi ed grain boundaries. However, the hardening eff ect of precipitated κ-carbide was insignifi cant and might not play a signifi cant role in the hotductility behavior of the lightweight alloy used in this study.

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