Journal of the Korean Society for Heat Treatment (열처리공학회지)

The Korean Society for Heat Treatment (한국열처리공학회)
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Computational Simulation of Carburizing and Quenching Processes of a Low Alloy Steel Gear

저합금강 기어의 침탄 및 소입 공정에 대한 전산모사

  • Lee, Kyung Ho (Department of Materials Science and Engineering, Yonsei University) ;
  • Han, Jeongho (Department of Materials Science and Engineering, Yonsei University) ;
  • Kim, Gyeong Su (Material Research Department, Hyundai Heavy Industries) ;
  • Yun, Sang Dae (Quality Assurance Team, Sungbo Powertrain & Technology) ;
  • Lee, Young-Kook (Department of Materials Science and Engineering, Yonsei University)
  • 이경호 (연세대학교 공과대학 신소재공학과) ;
  • 한정호 (연세대학교 공과대학 신소재공학과) ;
  • 김경수 (현대중공업(주)) ;
  • 윤상대 (성보 P&T(주)) ;
  • 이영국 (연세대학교 공과대학 신소재공학과)
  • Received : 2015.10.08
  • Accepted : 2015.10.20
  • Published : 2015.12.30
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Abstract

The aim of the present study was to predict the variations in microstructure and deformation occurring during gas carburizing and quenching processes of a SCM420H planetary gear in a real production environment using the finite element method (FEM). The motivation for the present study came from the fact that previous FEM simulations have a limitation of the application to the real heat treatment process because they were performed with material properties provided by commercial programs and heat transfer coefficients (HTC) measured from laboratory conditions. Therefore, for the present simulation, many experimentally measured material properties were employed; phase transformation kinetics, thermal expansion coefficients, heat capacity, heat conductivity and HTC. Particularly, the HTCs were obtained by converting the cooling curves measured with a STS304 gear without phase transformations using an oil bath with an agitator in a real heat treatment factory. The FEM simulation was successfully conducted using the aforementioned material properties and HTC, and then the predicted results were well verified with experimental data, such as the cooling rate, microstructure, hardness profile and distortion.

Keywords

References

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