Transactions of Materials and Heat Treatment

Title：Flow stress model for steel 30Cr during hot deformation

Authors： Xiao Yanhong Guo Cheng

Unit： Shanghai Polytechnic University Xi′an Jiaotong University

KeyWords： large valve flow stress constitutive equation multi-directional die forging process hot compression

ClassificationCode：TG113

year,vol(issue):pagenumber：2018,43(1):176-180

Abstract：

Steel 30Cr is used to forge the large valve. A set of hot compression experiment on steel 30Cr was conducted by Gleeble-1500 thermal-mechanical simulator, and the true stress-true strain curves were achieved with strain rates of 0.1, 0.5, 2.5 and 10 s-1, deformation temperatures of 1000, 1050, 1100, 1150 and 1200 ℃ and deformation degree of 60%,respectively. The experimental results show that the flow stress at high temperature decreases with the increasing of deformation temperature and the decreasing of strain rate, and in the certain deformation conditions, the typical characteristics of true stress-true strain curves of dynamic recrystallization with single peak appears. Furthermore, the rheological behavior at hight temperature of steel 30Cr was described by the Arrhenius hyperbolic sine relationship, and the activation energy of hot deformation was confirmed. Finally, the flow stress model of steel 30Cr was established. The results can provide good reference for numerical simulation and determination of process parameters for die forging of large valve．

Funds：

上海市教委青年教师资助计划 (A30DB1621009-52); 校级重点学科“材料科学与工程”项目(XXKZD1601)

作者简介：肖艳红(1983-)，女，博士，讲师，E-mail：yhxiao@sspu.edu.cn；通讯作者：郭成(1948-)，男，博士，教授，博士生导师，E-mail：gch@mail.xjtu.edu.cn

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