Transactions of Materials and Heat Treatment

Title：Hot deformation behavior and constitutive model for PH13-8Mo steel

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ClassificationCode：TG142

year,vol(issue):pagenumber：2021,46(5):234-239

Abstract：

The hot compression test under different parameters of PH13-8Mo steel was conducted by Gleeble-1500 thermo-mechanical simulator. The hot deformation behaviors of test steel were studied at the deformation temperatures of 850-1030 ℃ and the strain rates of 0.1-10 s-1. The results show that the flow stress of PH13-8Mo steel increases first, and then falls into a stable stage and finally increases again in the hot compression deformation process. Dynamic recovery and recrystallization behaviors lead to the soften phenomenon in the hot deformation process, and higher deformation temperature contributes to the occurrence of dynamic recrystallization. There is a high temperature sensitivity with the grain sizes of PH13-8Mo steel. The hot deformation constitutive model of PH13-8Mo steel was built based on Z-G model and test results, which can reflect the true stress-true strain change laws of test steel in the hot deformation process. The related coefficient was 0.965 and the root mean square error was 20.9 in the predction. According to the simulation analysis and verification, the Z-G model provides theoretical reference for the selection of hot deformation process for PH13-8Mo steel.

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杨大伟（1985-），男，硕士，工程师 E-mail：trustdavid@126.com

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