Journal of the Korean Society for Heat Treatment (열처리공학회지)

The Korean Society for Heat Treatment (한국열처리공학회)
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Effect of Mn Addition on the Microstructural Changes and Mechanical Properties of C-Mn TRIP Steels

C-Mn TRIP강의 미세조직 변화와 기계적 성질에 미치는 Mn 첨가의 영향

  • Hong, H. (Research Center of Advanced Materials Development, Chonbuk National Univ.) ;
  • Lee, O.Y. (Research Center of Advanced Materials Development, Chonbuk National Univ.) ;
  • Song, K.H. (School of Computer Basis Applied Mechanics, Jeonju Technical College)
  • 홍호 (전북대학교 신소재개발연구센터) ;
  • 이오연 (전북대학교 신소재개발연구센터) ;
  • 송기홍 (전주공업대학 컴퓨터응용기계계열)
  • Received : 2003.05.13
  • Published : 2003.07.31
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Abstract

Various types of high strength steel sheets were usually used for improving the automobile safety and fuel efficiency by reducing the vehicle weight. The present study aimed to develop the TRIP (transformation induced plasticity) aided high-strength low carbon steel sheets by using a reverse transformation process. The 0.1C-4~8Mn steels were reverse-transformed by slow heating to intercritical temperature region and then furnace cooled to the room temperature. Granular type retained austenite was observed in 4Mn steel and lath type retained austenite was also observed in 6~8Mn steel. The results show that the 6Mn steel under reverse transformed at $625^{\circ}C$ for 6 hrs has maximum elongation up to 39%. The optimum strength-elongation combination was 3,888 ($kg/mm^2{\times}%$) when the 8Mn steel was reverse transformed at $625^{\circ}C$ for 12 h.

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