4Cr5MoSiV1热作模具钢的热变形行为与热加工图  

Hot Deformation Behavior and Hot Processing Maps of 4Cr5MoSiV1 Hot Working Die Steel

作　　者：邱宇 袁飞 曾元松 孟强 罗锐[2] 董继红[1,3] 赵华夏 QIU Yu;YUAN Fei;ZENG Yuansong;MENG Qiang;LUO Rui;DONG Jihong;ZHAO Huaxia(AVIC Manufacturing Technology Institute,Beiing 100024,China;School of Materials Science and Engineering,Jiangsu University,Zhenjiang 212013,China;Beijing FSW Technology Co.,Ltd.,Beiing 100024,China)

机构地区：[1]中国航空制造技术研究院,北京100024 [2]江苏大学材料科学与工程学院,镇江212013 [3]北京赛福斯特技术有限公司,北京100024

出　　处：《机械工程材料》2021年第2期71-77,共7页Materials For Mechanical Engineering

基　　金：航空科学基金资助项目(20181125002);江苏省重点研发计划(产业前瞻与共性关键技术)项目(BE2017127)。

摘　　要：利用Gleeble-3500型热模拟试验机对4Cr5MoSiV1热作模具钢进行单道次等温压缩试验,研究了其在变形温度750~1050℃,应变速率0.001~0.1s^(-1)条件下的热变形行为,并观察变形后的显微组织;根据试验得到的真应力-真应变曲线,构建了03真应变下的Arrhenius高温本构模型,并在动态材料模型基础上绘制了热加工图,从而得到该钢的合理热加工区间。结果表明:4Cr5MoSiV1钢的变形抗力随变形温度的升高或应变速率的降低而显著降低;4Cr5MoSiV1钢的热变形激活能为59452 kJ·mol^(-1);在试验参数范围内,4Cr5MoSiV1钢合理的热加工区间为变形温度1050℃、应变速率0.001~0.01s^(-1),此时组织中的碳化物细小且弥散分布,第二相强化效果显著。Single-pass isothermal compression tests were carried out on 4 Cr5 MoSiVl hot working die steel by Gleeble-3500 thermal simulator.The hot deformation behavior of the steel at deformation temperatures of 750-1050℃and strain rates of 0.001-0.1 s^(-1) was studied,and the microstructures after deformation were observed.On the basis of true stress-true strain curves obtained from the tests,the Arrhenius high-temperature constitutive model at true strain of 03 was established.The hot processing maps were drawn by the dynamic material model to obtain the reasonable hot processing window of the steel.The results show that the deformation resistance of4 Cr5 MoSiV1 steel decreased significantly with increasing deformation temperature or decreasing strain rate.The hot deformation activation energy of 4 Cr5 MoSiVl steel was 59452 kJ·mol^(-1).Within the range of test parameters,the reasonable hot processing window of 4 Cr5 MoSiVl steel was at a deformation temperature of 1050℃and strain rates of 0.001-0.01 s^(-1);at this time the carbide was fine and dispersed,and the strengthening effect of the second phase was significant.

关 键 词：4Cr5MoSiV1热作模具钢 热变形行为 本构模型 热加工图 

分 类 号：TG142.1[一般工业技术—材料科学与工程]