C-Mn계 TRIP강의 잔류오스테나이트 생성과 기계적 성질에 미치는 역변태처리의 영향

유재선; 홍호; 이오연; 진광근; 김성주

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자료유형: 학술저널

저자정보: 유재선 (전북대학교 신소재공학부, 자동차신기술연구센터) 홍호 (전북대학교 신소재공학과, 자동차신기술연구센터) 이오연 (전북대학교 신소재공학과, 자동차신기술연구센터) 진광근 (POSCO 기술연구소 자동차강재연구센터) 김성주 (POSCO 기술연구소 자동차강재연구센터)

저널정보: 한국재료학회 한국재료학회지 한국재료학회지 제14권 제2호

발행연도: 2004.1

수록면: 126 - 132 (7page)

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The high strength steel sheets has been widely used as the automobile parts to reduce the weight of a vehicle. The aim of this research is to develop the TRIP aided high strength low carbon steels using reverse transformation process. The 0.15C-4Mn and 0.15C-6.5Mn steel sheets were reversely transformed by slow heating to intercritical temperature region and air cooling to room temperature. The stability of retained austenite depends on the enrichment of carbon and manganese by diffusion during the reverse transformation. The amount of retained austenite formed after reversely transformed at $645^{\circ}C$ for 12 hrs. was about 46vol.% in hot rolled 0.lC-6.5Mn steel. The change in volume fraction of retained austenite with a holding temperature was consistent with the changes in elongation and the strength-ductility combination. The tendency of tensile strength to increase with increasing the holding temperature was due to the decrease of retained austenite after cooling from the higher temperature of $670 ^{\circ}C$. The maximum strength-ductility combination was about 4,250 kg/$\textrm{mm}^2$ㆍ% when the hot rolled 0.lC-6.5Mn steel was reversely transformed at $645^{\circ}C$ for 12 hrs.

#TRIP steels #reverse transformation #retained austenite #strength-ductility combination

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