Journal of the Korean Society for Heat Treatment (열처리공학회지)

The Korean Society for Heat Treatment (한국열처리공학회)
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Effect of Chemical Composition on the Microstructure and Tensile Property in TRIP-assisted Multiphase Steels

TRIP형 복합조직강의 미세조직 및 인장성질에 미치는 화학조성의 영향

  • Lee, K.Y. (Division of Automotive and Mechanical Eng., Nambu University) ;
  • Jang, W.Y. (Dept. of Metallurgical Eng., Chosun University) ;
  • Kang, J.W. (Dept. of Metallurgical Eng., Chosun University)
  • 이기열 (남부대학교 자동차기계공학부) ;
  • 장우양 (조선대학교 공과대학 신금속소재공학과) ;
  • 강조원 (조선대학교 공과대학 신금속소재공학과)
  • Received : 2003.03.12
  • Published : 2003.05.31
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Abstract

The effect of chemical composition on the microstructural change and tensile property in TRIP-assisted steels with different chemical composition was investigated by using SEM, TEM, XRD and UTM. As a result of microscopic observation, the morphology of retained austenite could be identified as two types; a granular type in a steel containing higher Si and a film type in a steel having higher C. For the case of higher C-containing steel with a tensile strength of 860 MPa and a total elongation of 38%, film-typed retained austenite could be observed between lath bainitic ferrite. Actually, metastable retained austenite was a requisite for the good formability, which means that chemical composition plays a significant role in the microstructure and tensile property of TRIP-assisted steels. With respect to tensile property, the steels containing suitable Si and Mn, respectively, showed a typical TRIP effect in stress-strain curve, while a steel containing higher Mn content exhibited the similar behavior shown in dual phase steel.

Keywords

Acknowledgement

Supported by : 조선대학교

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