摘要
采用Q345钢,在Gleeble-3800上进行等温热压实验,实验应变速率0.01~10 s-1、变形温度850-1100℃条件下。依据得出的热压缩真应力-应变曲线,基于Arrhenius双曲正弦方程,建立Q345钢的本构方程,并构建相应的动态材料模型(DMM)的热加工图。结果显示:热变形中,随着应变速率的增加,流变应力增加,然而,随温度的增加而流变减小。温度为975~1100℃、应变速率为1~10 s-1,耗散值较大,表明易发生动态再结晶,具备良好的热加工性能。
The isothermal hot pressing experiment of Q345 steel is carried out on Gleeble-3800 hot working process simulation test machine.According to the experimental results,the true stress-strain curve under the conditions of strain rate 0.01~10 s-1 and deformation temperature 850~1100℃can be obtained.Based on Arrhenius hyperbolic sine equation,the constitutive equation of Q345 steel and the hot working diagram based on dynamic material model(DMM)are constructed.The results show that the rheological stress increases with the increase of strain rate and decreases with the increase of temperature.The dissipation value of Q345 steel isrelatively large at temperature 975~1100℃and strain rate 1~10 s-1,and easy todynamic recrystallization,the material has good process performance,good thermal processing performance,the material has good process performance.
作者
张健
赵广辉
王顺
李玉贵
宋耀辉
ZHANG Jian;ZHAO Guang-hui;WANG Shun;LI Yu-gui;SONG Yao-hui(Engineering Research Center Heavy Machinery Ministry of Education,Taiyuan University of Science and Technology,Taiyuan 030024,China)
出处
《重型机械》
2020年第5期70-74,共5页
Heavy Machinery
基金
山西省青年科学基金(201801D2211120)
山西省重点研究开发项目(201703D111003)
山西省科技重大项目(20181101015)
太原科技大学科研启动资金项目(20172014)
山西省优秀博士学位基金项目(20182061)
山西省高等学校科技创新计划(2019L0622)。
关键词
Q345钢
流变应力
热加工图
热模拟实验
Q345 steel
rheological stress
hot working drawing
thermal simulation experiment
