Transactions of Materials and Heat Treatment

Title：Flow stress model of 25Cr2Ni4MoV steel in hot compression test

Authors： Ye Liyan Zhai Yuewen Zhou Leyu Lu Jianbang Jiang Peng

Unit： Beijing Research Institute of Mechanical and Electrical Technology Ltd. China National Machinery Industry Corporation Ltd.

KeyWords： super large low pressure integral rotor 25Cr2Ni4MoV steel hot compression flow stress-strain curve constitutive equation

ClassificationCode：TG113

year,vol(issue):pagenumber：2019,44(3):144-148

Abstract：

25Cr2Ni4MoV steel is used to forge super large low pressure integral rotor. A set of hot compression experiments about 25Cr2Ni3MoV steel was conducted by thermal-mechanical simulator Gleeble-1500, and the true stress-true strain curves were achieved under temperatures 900, 1000, 1100, 1150, 1200 and 1250 ℃, strain rates 0.001，0.005，0.01，0.05，0.1 and 0.5 s-1 and compressive strain 60%, respectively. The experimental results show that when the temperature is constant, the maximum stress increases with the increasing strain rate, and when the strain rate is constant, the maximum stress decreases with the increasing temperature. Under the certain deformation conditions, the flow stress-strain curve of high temperature appears the typical characteristic of dynamic recrystallization stress-strain curve with single peak. Furthermore, the activation energy of hot deformation was determined by the Arrhenius model to fit the true stress-strain curve of 25Cr2Ni4MoV steel, and the constitutive equation of 25Cr2Ni4MoV steel was established. Thus, the research results can guide the numerical simulation and process design of super large low pressure integral rotor.

Funds：

工业和信息化部-工业强基工程“超大型构件先进成形、焊接及加工制造工艺” （TC160A310）

叶丽燕（1987-），女，博士研究生，工程师，E-mail：yely@afdex.com.cn；通讯作者：蒋鹏（1964-），男，博士，博士生导师，E-mail：jp1964@163.com

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