Journal of the Korean Society for Heat Treatment (열처리공학회지)

The Korean Society for Heat Treatment (한국열처리공학회)
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The Effect of Second Stage Heat Treatment on Mechanical Properties of TRIP aided Triple Phase Steel

TRIP형 복합조직강판의 기계적 성질에 미치는 2단 열처리 영향

  • Lee, Y.S. (Dept. of metallurgical Engineering, Sungkyunkwan Univ.) ;
  • Kim, Y.S. (Dept. of metallurgical Engineering, Sungkyunkwan Univ.) ;
  • Yoon, J.K. (National institute of Technology and Quality) ;
  • Park, H.S. (Dept. of metallurgical Engineering, Sungkyunkwan Univ.)
  • 이영섭 (성균관대학교 공과대학 금속공학과) ;
  • 김용성 (성균관대학교 공과대학 금속공학과) ;
  • 윤종구 (국립기술품질원) ;
  • 박현순 (성균관대학교 공과대학 금속공학과)
  • Published : 1998.09.30
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Abstract

Heat treatment conditions and the formation of microstructures were studied for improving the transformation-induced plasticity(TRIP) effect of retained austenite and mechanical properties of Fe-0.2%C-1.5%Si-1.5%Mn sheet steel. An excellent combination of elongation about 30% and high strength over 760MPa was achieved by processing of intercritical annealing and isothermal holding Intercritical annealing the sheet steel produced fine particles($1{\sim}2{\mu}m$) of retained austenite which were stabilized due to C enrichment by subsequent holding in bainite transformation range. Heat treatment conditions were depended on the shape and distribution of second phases as well as the volume fraction and stability of retained austenrte. In this work, the heat treatment condition of optimal strength-elongation balance was obtained by holding the steel at $400^{\circ}C$ for 200sec, after intercritical annealing at $790^{\circ}C$ for 300sec.

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Acknowledgement

Supported by : 포항종합제철주식회사