Transactions of Materials and Heat Treatment

Title：High temperature plastic deformation behavior and hot processing map on as-cast ER8 steel

Authors： Chen Fei1 2 Zhang Xiaofeng3 Dang Shu′e1 2 Ren Jinyu1 2 Zhu Xuetong1 2

Unit： 1. School of Materials Science and Engineering Taiyuan University of Science and Technology 2. Heavy Castings and Forgings Engineering Technology Research Center of Shanxi Province Taiyuan University of Science and Technology3. Technique Center Taiyuan Heavy Industry Transit Equipment Co. Ltd.

KeyWords： as-cast ER8 steel high temperature plastic deformation hot processing map flow stress curve hot workability

ClassificationCode：TG314.4

year,vol(issue):pagenumber：2023,48(8):224-230

Abstract：

The uniaxial hot compression test of as-cast ER8 steel at the strain rate of 0.001-1 s-1 and the temperature of 900-1250 ℃ was carried out by thermal simulation testing machine Gleeble-1500D, and the hot processing map was established based on the obtained flow stress curve. Then the influences of temperature and strain rate on the hot workability of material were analyzed in detail. The results show that in the deformation temperature range of 900-1250 ℃ and the strain rate range of 0.001-1 s-1, the flow stress curve of as-cast ER8 steel is a typical dynamic recrystallization curve. Only when the deformation temperature is lower than 900 ℃ and the strain rate is higher than 1 s-1, the flow stress curve has obvious characteristics of dynamic recovery curve. According to the analysis of the hot processing map of as-cast ER8 steel, in order to prevent the instability of high temperature plastic deformation, the deformation temperature during forging should be greater than 950 ℃, and when the strain is 0.20, the strain rate is recommended to be less than 0.05 s-1.

Funds：

山西省重点研发计划重点项目（201703D111005）；太原科技大学科研启动基金资助项目（20222051）

作者简介：陈飞（1990-），男，博士，讲师,E-mail：chenf@tyust.edu.cn

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