Journal of the Korean Society for Heat Treatment (열처리공학회지)

The Korean Society for Heat Treatment (한국열처리공학회)
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Microstructures and Tensile Properties by Multi-step Isothermal Heat Treatment in Conventional TRIP Steel

상용 TRIP강의 다단 항온 변태 열처리에 따른 미세조직 및 인장 특성

  • 김경원 (부산대학교 재료공학과) ;
  • 이창훈 (한국기계연구원 부설 재료연구소) ;
  • 강전연 (한국기계연구원 부설 재료연구소) ;
  • 이태호 (한국기계연구원 부설 재료연구소) ;
  • 조경목 (부산대학교 재료공학과)
  • Received : 2016.03.02
  • Accepted : 2016.03.17
  • Published : 2016.06.30
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Abstract

In recent years, TRIP steels which are composed of ferrite, bainite, and retained austenite have drawn much attention for automotive sheets due to excellent combination of strength and ductility. The effect of two-step isothermal heat treatment of bainitic transformation on microstructures, especially retained austenites and tensile properties in the conventional TRIP steel was investigated. A two-step isothermal heat treatment, in which 50% bainitic transformation occurred at high temperature, followed by bainitic transformation at low temperature, improves tensile properties, resulting from enhanced mechanical stability of retained austenite against external plastic deformation due to refinement of retained austenites, compared to single-step isothermal heat treatment.

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References

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