Transactions of Materials and Heat Treatment

Title：Hot deformation behavior of 8Cr5MoV steel for cold working roller

Authors： Zhu Yuanjian Li Heng Wang Han Zhang Zhenwei Luo Jiping Wu Yucheng

Unit： Hefei University of Technology

KeyWords： 8Cr5MoV alloy steel cold roller hot deformation constitutive equation hot processing map

ClassificationCode：TG142.72

year,vol(issue):pagenumber：2020,45(9):171-176

Abstract：

Thermal compression experiments of 8Cr5MoV steel for cold working roller were carried out by thermal simulation machine Gleeble-3500 under the deformation temperature of 850-1150 ℃, the strain rate of 0.005-5 s-1 and the maximum deformation of 60%, its hot deformation behavior and the hot processing characteristics were obtained by the true stress-true strain curve coming from the experiments. Then, the hot deformation behavior of 8Cr5MoV alloy steel was described by the hyperbolic sine model, and the constitutive equation and hot processing map of the material under the experimental conditions were established. The results show that the Arrhenius model characterizes the hot deformation behavior of 8Cr5MoV alloy steel precisely, and the thermal deformation activation energy under this experiment condition is 393.6075 kJ·mol-1. Furthermore, the hot processing maps of 8Cr5MoV alloy steel have significant differences under the different strains, which is related to dynamic recrystallization softening, and the best hot processing performance with more than 31% energy dissipation efficiency and 38% peak value of energy dissipation efficiency was obtained under the deformation temperature of 1075-1150 ℃ and the strain rate of 0.0183-1 s-1.

Funds：

国家重点研发计划重点专项（2017YFB0701804，2017YFB0701803）

朱元健（1994-），男，硕士研究生 E-mail：zyjmota@163.com 通讯作者：李亨（1984-），男，博士，副研究员 E-mail：liheng0205@hfut.edu.cn

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