Journal of the Korean Society for Heat Treatment (열처리공학회지)

The Korean Society for Heat Treatment (한국열처리공학회)
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Heat Treatment Process Design of CrMoSC1 Steel by Prediction of Phase Transformation and Thermal Stress Analysis

상변태 예측 및 열응력 해석에 의한 CrMoSC1 강의 열처리 공정 설계

  • Choi, B.H. (Center for e-Design, Korea Institute of Industrial Technology) ;
  • Kwak, S.Y. (Center for e-Design, Korea Institute of Industrial Technology) ;
  • Kim, J.T. (Center for e-Design, Korea Institute of Industrial Technology) ;
  • Choi, J.K. (Center for e-Design, Korea Institute of Industrial Technology)
  • 최봉학 (한국생산기술연구원 디지털설계센터) ;
  • 곽시영 (한국생산기술연구원 디지털설계센터) ;
  • 김정태 (한국생산기술연구원 디지털설계센터) ;
  • 최정길 (한국생산기술연구원 디지털설계센터)
  • Received : 2005.06.27
  • Accepted : 2005.07.25
  • Published : 2005.07.30
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Abstract

Although heat treatment is a process of great technological importance in order to obtain desired mechanical properties such as hardness, the process was required a tedious and expensive experimentation to specify the process parameters. Consequently, the availability of reliable and efficient numerical simulation program would enable easy specification of process parameters to achieve desired microstructure and mechanical properties without defects like crack and distortion. In present work, the developed numerical simulation program could predict distributions of microstructure and thermal stress in steels under different cooling conditions. The computer program is based on the finite difference method for temperature analysis and microstructural changes and the finite element method for thermal stress analysis. Multi-phase decomposition model was used for description of diffusional austenite decompositions in low alloy steels during cooling after austenitization. The model predicts the progress of ferrite, pearlite, and bainite transformations simultaneously during quenching and estimates the amount of martensite also by using Koistinen and Marburger equation. To verify the developed program, the calculated results are compared with experimental ones of casting product. Based on these results, newly designed heat treatment process is proposed and it was proved to be effective for industry.

Keywords

Acknowledgement

Supported by : 산업자원부

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