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Development of 1.2 GPa Ferrite-based Lightweight Steels via Low-temperature Temperingopen access저온 템퍼링을 이용한 1.2 GPa급 페라이트계 경량철강 개발

Other Titles
저온 템퍼링을 이용한 1.2 GPa급 페라이트계 경량철강 개발
Authors
Bae, Hyo JuKo, Kwang KyuPark, Hyoung SeokJeong, Jae SeokKim, Jung GiSung, HyokyungSeol, Jae Bok
Issue Date
Oct-2021
Publisher
KOREAN INST METALS MATERIALS
Keywords
ferrite-based lightweight steels; tempering; size-dependent partitioning; dislocation movement
Citation
KOREAN JOURNAL OF METALS AND MATERIALS, v.59, no.10, pp 683 - 691
Pages
9
Indexed
SCIE
SCOPUS
KCI
Journal Title
KOREAN JOURNAL OF METALS AND MATERIALS
Volume
59
Number
10
Start Page
683
End Page
691
URI
https://scholarworks.gnu.ac.kr/handle/sw.gnu/3153
DOI
10.3365/KJMM.2021.59.10.695
ISSN
1738-8228
2288-8241
Abstract
Previously reported low-Mn ferritic-based lightweight steels are potential candidates for industrial applications, however, they typically exhibit lower strength, with < 1 GPa and lower strength-ductility balance, than medium- and high-Mn austenitic lightweight steels. Herein, we introduce a low-temperature tempering-induced partitioning (LTP) treatment that avoids the strength-ductility dilemma of low-Mn ferritic-based steels. When the LTP process was performed at 330 degrees C for 665 s, the strength of typical ferritic base Fe-2.8Mn5.7Al0.3C (wt%) steel with heterogeneously sized metastable austenite grains embedded in a ferrite matrix, exceeded 1.1 GPa. Notably, the increased strength-ductility balance of the LTP-processed ferritic steel was comparable to that of the high-Mn based austenitic lightweight steel series. Using microscale to near-atomic scale characterization we found that the simultaneous improvement in strength and total elongation could be attributed to size-dependent dislocation movement, and controlled deformation-induced martensitic transformation.
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Kim, Jung Gi
대학원 (나노신소재융합공학과)
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