60钢热压缩变形行为及其变参数Arrhenius本构方程  

Hot Compression Deformation Behavior and Variable Parameter Arrhenius Constitutive Equation of 60 Steel

作　　者：赵劲松 周昌磊 黄素霞[2] 李河宗[2] ZHAO Jinsong;ZHOU Changlei;HUANG Suxia;LI Hezong(Large-Section Steel Rolling Mill,Hansteel Co.,HBIS Group,Handan 056015,China;Key Laboratory of Intelligent Industrial Equipment Technology of Hebei Province,Hebei University of Engineering,Handan 056038,China)

机构地区：[1]河钢集团邯钢公司大型轧钢厂,邯郸056015 [2]河北工程大学河北省智能工业装备技术重点实验室,邯郸056038

出　　处：《机械工程材料》2022年第11期86-91,共6页Materials For Mechanical Engineering

基　　金：河北省自然科学基金资助项目(E2013402064);河北省外专百人计划项目。

摘　　要：采用Gleeble-1500型热模拟试验机对60钢进行不同温度(730,750,800,850,900,1000℃)和不同应变速率(0.01,0.1,1,5,10 s^(-1))的热压缩试验,总真应变为0.8,分析了60钢在热压缩过程中的变形行为;引入变参数Arrhenius模型,采用五阶多项式对模型中各参数随应变的变化关系进行拟合,构建出60钢高温变形本构方程,并对方程的精确性进行了评估。结果表明:变形温度越高,应变速率越低,60钢的流变应力越小;在较低温度和较高应变速率下,60钢热压缩变形的软化机制主要为动态回复,在较高温度和较低应变速率下则主要为动态再结晶;建立的变参数Arrhenius本构方程对流变应力的预测值与试验值的拟合相关系数达到0.994597,说明该本构方程可以较好地描述60钢的高温变形行为。Hot compression tests were carried out on 60 steel at different temperatures(730,750,800,850,900,1000℃)and different strain rates(0.01,0.1,1,5,10 s^(-1))with a Gleeble-1500 thermal simulator;the total true strain was 0.8.The deformation behavior of 60 steel during the hot compression process was analyzed.A variable parameter Arrhenius constitutive model was introduced.The relationships between the parameters of the model and the strains were fitted by a fifth-order polynomial,and then the constitutive equation for high temperature deformation of 60 steel was established.The accuracy of the equation was evaluated.The results show that the higher the deformation temperature or the lower the strain rate,the lower the flow stress of 60 steel.At lower temperatures and higher strain rates,the softening mechanism of hot compression deformation of 60 steel was mainly dynamic recovery;at higher temperatures and lower strain rates,it was mainly dynamic recrystallization.The fitting correlation coefficient between the predicted flow stresses by the established variable parameter Arrhenius constitutive equation and the experimental values was up to 0.994597,indicating that the constitutive equation could describe the high temperature deformation behavior of 60 steel well.

关 键 词：60钢 热变形行为 变参数 Arrhenius本构模型 

分 类 号：TG142[一般工业技术—材料科学与工程]