Journal of the Korean Society for Heat Treatment (열처리공학회지)

The Korean Society for Heat Treatment (한국열처리공학회)
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Microstructure and Mechanical Properties of 25Cr-7Ni-3Mo Duplex Stainless Steel

25Cr-7Ni-3Mo 2상 스테인리스강의 미세조직과 기계적성질

  • Kang, C.Y. (Dept. of Metallugical Engineering, Pukyong National University) ;
  • Kim, H.J. (Dept. of Metallugical Engineering, Pukyong National University) ;
  • Kim, C.G. (Dept. of Metallugical Engineering, Pukyong National University) ;
  • Kim, I.S. (Dept. of Molecular Design and Engineering, Nagoya University) ;
  • Joo, D.W. (Dept. of Metallugical Engineering, Dong A Universityerials) ;
  • Seong, J.H. (Dept. of Metallugical Engineering, Dong A Universityerials)
  • 강창룡 (부경대학교 공과대학 금속공학과) ;
  • 김효정 (부경대학교 공과대학 금속공학과) ;
  • 김창규 (부경대학교 공과대학 금속공학과) ;
  • 김익수 (명고옥대학 공학부 물질제어공학) ;
  • 주동원 (동아대학교 공과대학 금속공학과) ;
  • 성장현 (동아대학교 공과대학 금속공학과)
  • Published : 1998.09.30
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Abstract

This study was carried out to investigate the influence of variations in the temperature and time of isothermal heat treatment, applied stresses and prestrain on the isothermal transformation behavior of ${\gamma}$ and ${\sigma}$ phases and mechanical properties of 25Cr-7Ni-3Mo duplex stainless steel. The precipitation of ${\gamma}$ and ${\sigma}$ phases through isothermal heat treatment showed the type curves with a certain incubation period, the curve migrated to in a short period of time and the amount of precipitation increased with decreasing isothermal heat treatment temperature. Under the state of isothermal transformation, the precipitation of ${\gamma}$ and ${\sigma}$ phases was stimulated by applied stress, with increasing applied stress, the curves migrated to in a short period of time and also observed that the application of stress has a greater influence on the amount of ${\sigma}$ precipitation than that of ${\gamma}$ precipitation. The precipitation of ${\gamma}$ and ${\sigma}$ phases was stimulated by cold and warm rolling before isothermal heat treatment and precipitation of ${\gamma}$ and ${\sigma}$ phases has a greater influence on the warm rolling than cold rolling. The tensile strength and hardness increased with increasing cold and warm rooling reduction ratio.

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