한국소성가공학회:학술대회논문집 (Proceedings of the Korean Society for Technology of Plasticity Conference)
- 한국소성가공학회 2004년도 제5회 압연심포지엄 신 시장 개척을 위한 압연기술
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- Pages.297-306
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- 2004
S20C강 저속 라운드-모발 압연의 AGS 분포
AGS Distribution in Low-Speed Round-Oval Rolling of S20C Steel
- 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)
- 발행 : 2004.08.01
초록
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.