Microstructure Evolution Modeling and Simulation for Dynamic Recrystallization of Cr12MoV Die Steel During Hot Compression Based on Real Metallographic Image

F. Sun; D. Q. Zhang; L. Cheng; P. Zheng; D. M. Liao; B. Zhu

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자료유형: 학술저널

저자정보: F. Sun (Huazhong University of Science and Technology) D. Q. Zhang (Huazhong University of Science and Technology) L. Cheng (Huazhong University of Science and Technology) P. Zheng (Nanyang Technological University) D. M. Liao (Huazhong University of Science and Technology) B. Zhu (Huazhong University of Science and Technology)

저널정보: 대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.25 No.4

발행연도: 2019.1

수록면: 966 - 981 (16page)

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In this work, microstructure evolution of dynamic recrystallization (DRX) behavior in Cr12MoV die steel was investigatedvia experiments and simulations systematically. Firstly, hot compression tests were performed to obtain the true stress–straincurves. Based on the experimental results, the fl ow stress model was established, and Avrami equation was developed tomodel the kinetics of DRX. Then, the cellular automaton (CA) model was established to describe DRX behavior. In orderto obtain more accurate simulation results, a microstructure enhancement, extraction and conversion program based on fi ngerprintimage enhancement algorithm was developed to generate real initial microstructure which could be directly usedin CA simulation. With real initial microstructure generation, good agreement between simulated and experimental resultswas achieved, indicating the high accuracy of the established CA model. Finally, the CA model was employed to investigatethe hot deformation behavior of Cr12MoV die steel under multiple thermomechanical conditions. It could be found that alower strain rate was benefi cial to the occurrence of DRX. When the strain rate was beyond 1.0 s −1 , the DRX fraction wasvery small. This work would provide a signifi cant guidance to optimize the hot working process of Cr12MoV die steel orsome other similar steels.

#Cr12MoV die steel · Hot deformation · Dynamic recrystallization · Cellular automaton · Microstructure evolution · Fingerprint image enhancement

참고문헌 (44)

참고문헌 신청

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