열처리공학회지 (Journal of the Korean Society for Heat Treatment)

  • 제13권4호
  • /
  • Pages.253-258
  • /
  • 2000
  • /
  • 1225-1070(pISSN)
  • /
  • 2508-4046(eISSN)
한국열처리공학회 (The Korean Society for Heat Treatment)
권호 표지

0.14C-6.5Mn 합금강의 미세조직과 잔류오스테나이트 형성에 미치는 역변태처리의 영향

Effect of Reverse Transformation on the Microstructure and Retained Austenite Formation of 0.14C-6.SMn Alloy Steel

  • 송기홍 (전주공업대학 정밀기계과) ;
  • 이오연 (전북대학교 신소재개발연구소)
  • Song, K.H. (Department of Precision Mechanics, Jeonju Technical Collage) ;
  • Lee, O.Y. (Researh Institute of Advanced Materials Development, Chonbuk National University)
  • 투고 : 2000.06.08
  • 발행 : 2000.07.30
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초록

The present study aimed to develop the TRIP(transformation induced plasticity) aided high strength low carbon steel sheets using reverse transformation process. The cold-rolled 0.14C-6.5Mn steel was reverse-transformed by slow heating to intercritical temperature region and air cooling to room temperature. An excellant combination of tensile strength and elongation of $98.3kgf/mm^2$ and 44.4% appears. This combination comes from TRIP phenomena of retained austenite during deformation. The stability of retained austenite Is very Important for the good ductility and it depends on diffusion of carbon and manganese during reverse transformation. The air cooling after holding at intercritical temperature retards the formation of pearlite and provides the carbon enrichment in retained austenite, resulting the increase of elongation in cold-roiled TRIP steel.

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