Journal of the Korean Society for Heat Treatment (열처리공학회지)

The Korean Society for Heat Treatment (한국열처리공학회)
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A Study on the Retained Austenite and Tensile Properties of TRIP Type High Strength Steel Sheet with Cu

Cu 함유 TRIP형 고장력 강판의 잔류오스테나이트 및 인장특성에 관한 연구

  • Kang, C.Y. (Department of Metallurgical Engineering, Pukyong National University) ;
  • Kim, H.J. (Department of Metallurgical Engineering, Pukyong National University) ;
  • Kim, H.G. (Department of Metallurgical Engineering, Pukyong National University) ;
  • Sung, J.H. (Department of Metallurgical Engineering, Dong-A University) ;
  • Moon, W.J. (Department of Mater, Science and Engineering, Nagoya University)
  • 강창룡 (부경대학교 공과대학 금속공학과) ;
  • 김효정 (부경대학교 공과대학 금속공학과) ;
  • 김한군 (부경대학교 공과대학 금속공학과) ;
  • 성장현 (동아대학교 공과대학 금속공학과) ;
  • 문원진 (명고옥대학 공학부)
  • Published : 1999.09.30
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Abstract

Volume fraction and morphology of retained austenite, tensile properties of TRIP type high strength steel sheet with Fe-C-Si-Mn-Cu chemical composition have been investigated. The retained austenite of granular, bar and film type existing in specimen was obtained after intercritical annealing and austempering. The granular type retained austenite increased with increase of intercritical annealing and austempering temperature. With increase of intercritical annealing temperature, retained austenite and carbon contents increased. Maximum contents of retained austenite was obtained by austempering at $400^{\circ}C$. The maximum tensile strength was obtained by austempering at $450^{\circ}C$ and maximum elongation was obtained at $400^{\circ}C$. T.S${\times}$E.L value increased with increase of retained austenite contents due to the elongation strongly controlled by contents of retained austenite, but tensile strength was affected with various factors such as bainitic structure etc.

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