Proceedings of the Korean Society for Technology of Plasticity Conference (한국소성가공학회:학술대회논문집)

The Korean Society for Technology of Plasticity and materials processing (한국소성∙가공학회)
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AGS Distribution in Low-Speed Round-Oval Rolling of S20C Steel

S20C강 저속 라운드-모발 압연의 AGS 분포

  • Kwon H. C. (Rolling Technology and Process Control Research Group, POSCO Technical Research Laboratories) ;
  • Lee H. W. (Department of Mechanical Engineering, KAIST) ;
  • Lee Y. (Department of Mechanical Engineering, Chung-Ang University) ;
  • Im Y. T. (Department of Mechanical Engineering, KAIST)
  • 권혁철 (공정제어 연구그룹, 포스코 기술연구소) ;
  • 이호원 (기계공학과, 한국과학기술원) ;
  • 이영석 (기계공학과, 중앙대학교) ;
  • 임용택 (기계공학과, 한국과학기술원)
  • Published : 2004.08.01
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Abstract

This study investigated Austenite Grain Size (AGS) distribution in Low-Speed Round-Oval Rolling. Rolling experiments were done along with the AGS numerical modeling to characterize the final AGS distribution and its kinetics behavior. For bar rolling experiment, we utilized the pilot rolling mill, operating at 34 fixed rpm, at POSCO Technical Research Laboratories. To investigate the microstructural observation, the rigid-viscoplastic finite element analysis was combined with Hodgson's AGS evolution model. To consider the transient thermal history in the integrative AGS modeling, additivity rule was introduced. The integrated analysis revealed that static or meta-dynamic recrystallization is responsible for the AGS difference in the inner or outer region of rolled bar. Comparative study showed that the current AGS modeling approach can be used to model the overall AGS distribution in bar rolling processes. For more accurate AGS prediction, the AGS modeling method should be verified under the various rolling conditions such as different rolling speeds and different deformations.

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