Transactions of Materials and Heat Treatment

Title：Hot processing map of Cr8 steel based on dynamic material model

Authors： Ma Xuefei Jiang Jun Li Honglei

Unit： Tianjin Pinggao Intelligent Electric Co. Ltd. Pinggao Group International Engineering Co. Ltd.

KeyWords： Cr8 steel hot processing map dynamic material model dynamic recrystallization microstructure

ClassificationCode：TG142.1

year,vol(issue):pagenumber：2019,44(1):166-171

Abstract：

The hot compression test at high temperature of Cr8 steel was conducted by thermal simulation test machine Gleeble-1500D, and its hot deformation behavior under temperature of 900-1200 ℃ and strain rate of 0.005-5 s-1 was studied. Then, the true stressstrain curve of Cr8 steel was obtained by test, and the hot processing maps of Cr8 steel were constructed by dynamic material model and Ziegler instablilty criterion. The results show that the hot deformation flow curves of this alloy show a typical dynamic recovery feature when the strain rate is less than 1 s-1, and its instability region mainly occurs at the high strain rate zone. With the increasing of strain, the value of power dissipation factor increases. Based on the built hot processing map, the optimum processing technology parameters of Cr8 steel are the temperature of 1125-1190 ℃ and the strain rate of 0.005-0.01 s-1. Furthermore, the dynamic recrystallization occurs in the microstructure of Cr8 steel by analyzing the metallographic photos of non-instability zone in the hot processing map, and the obtained microstructure has fine and uniformly distributed grain. However, many shear zones occur in the microstructure of Cr8 steel by analyzing the metallographic photos of instability zone in the hot processing map, and the correctness of the hot processing map of Cr8 steel is verified.

Funds：

马雪飞（1981-），男，学士，工程师，E-mail：maxfpg@126.com

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