基于摩擦修正的SCM920钢高温本构方程  

High-temperature constitutive equations of SCM920 steel based on friction correction

作　　者：兰毅 龚红英[1] 尤晋 吴玥 杨靖琪 邱文宇 Lan Yi;Gong Hongying;You Jin;Wu Yue;Yang Jingqi;Qiu Wenyu(School of Materials Science and Engineering,Shanghai University of Engineering Science,Shanghai 201620,China)

机构地区：[1]上海工程技术大学材料科学与工程学院,上海201620

出　　处：《锻压技术》2025年第4期248-256,共9页Forging & Stamping Technology

基　　金：上海市自然科学基金资助项目(20ZR1422700);上海工程技术大学校企产学合作资助项目(0235-E4-6000-24-0143-(24)CL-021)。

摘　　要：在变形温度为800~1000℃、应变速率为0.1~1.0 s^(-1)条件下,采用Gleeble-3800热模拟试验机对SCM920钢进行压缩量为60%的热压缩试验,获得其高温应力-应变曲线,通过计算膨胀系数判断出摩擦效应对流动应力产生的影响较大,并对该曲线进行摩擦修正。基于Arrhenius方程以及Zener-Hollomon方程,构建出适用于SCM920钢的双曲正弦本构方程,并在此基础上借助Deform-3D有限元软件对不同变形条件下的热压缩过程进行数值模拟,研究变形温度和应变速率对应力和应变的影响。结果表明:SCM920钢的流动应力随应变速率的降低和变形温度的上升显著降低;摩擦效应对流动应力产生的影响较大,且随着变形程度的增加而逐渐增大;摩擦修正前后,应力-应变曲线的整体趋势一致;变形温度的升高能有效降低流动应力,提高金属的变形能力,应变速率的提高增大了最大主应力且提高了试样的应力变化梯度。Under the conditions of the deformation temperature of 800-1000℃and the strain rate of 0.1-1 s^(-1),a hot compression test of SCM920 steel with a compression amount of 60%was conducted by thermal simulation test machine Gleeble-3800 to obtain its high-temperature stress-strain curves.Then,by calculating the coefficient of expansion,it was determined that the friction effect had a significant impact on the flow stress,and the curve was corrected by friction.Furthermore,based on the Arrhenius equation and the Zener-Hollomon equation,a hyperbolic sine constitutive equation suitable for SCM920 steel was constructed,and on this basis,the hot compression process under different deformation conditions was numerically simulated by finite element software Deform-3D to research the influences of deformation temperature and strain rate on stress and strain.The results show that the flow stress of SCM920 steel significantly decreases with the decreasing of strain rate and the increasing of deformation temperature,and the friction effect has a significant impact on the flow stress and gradually increases with the increasing of deformation degree.The overall trend of the stress-strain curve is consistent before and after friction correction.The increase of deformation temperature effectively reduces the flow stress and improves the deformation capacity of metal,and the increase of strain rate increases the maximum principal stress and enhances the stress change gradient of specimen.

关 键 词：热压缩 应力-应变曲线 摩擦修正 本构模型 DEFORM-3D 

分 类 号：TG386[金属学及工艺—金属压力加工]