新型Cr-Mo-V型热作模具钢高温流变应力模型  

High temperature rheological stress model for new type Cr-Mo-V hot work die steel

作　　者：元亚莎 石如星 王文焱[1] 徐恩献 王九花 张玉栋 元莎 YUAN Ya-sha;SHI Ru-xing;WANG Wen-yan;XU En-xian;WANG Jiu-hua;ZHANG Yu-dong;YUAN Sha(School of Materials Science and Engineering,Henan University of Science and Technology,Luoyang 471023,China;Luo Yang CITIC HIC Casting&Forging Co.,Ltd.,Luoyang 471039,China;CITIC Heavy Industries Co.,Ltd.,Luoyang 471039,China;Beijing Research Institute of Mechanical&Electrical Technology Co.,Ltd.,CAM,Beijing 100083,China)

机构地区：[1]河南科技大学材料科学与工程学院,河南洛阳471023 [2]洛阳中重铸锻有限责任公司,河南洛阳471039 [3]中信重工机械股份有限公司,河南洛阳471039 [4]中国机械总院集团北京机电研究所有限公司,北京100083

出　　处：《塑性工程学报》2024年第5期124-131,共8页Journal of Plasticity Engineering

基　　金：国家重点研发计划(2020YFB2008400);河南省重大科技专项(221100230200);洛阳市重大科技创新专项(2301020A)。

摘　　要：通过热压缩实验,获得实验钢在变形温度为950~1200℃、应变速率为0.001~5 s^(-1)和最大真应变为0.916条件下的真应力-真应变曲线。结果表明:在本实验选取的变形条件下,新型Cr-Mo-V钢呈现出典型的动态再结晶特征,变形温度高于1050℃且应变速率低于0.1 s^(-1)时,动态再结晶特征更明显;同一变形温度下,峰值应力和峰值应变随应变速率的提高呈增大趋势;同一应变速率下,峰值应力和稳态应力随变形温度的升高逐渐降低。采用多元线性回归法获得与峰值应力对应的Arrhenius方程模型参数,基于此建立了实验钢的高温流变应力本构模型。利用创建的不同应变下本构方程材料常数的八次多项式对实验钢的流变应力进行计算,应变补偿相关系数R和平均绝对相对误差e AARE分别为0.98902和3.21%,计算数据与实验数据吻合良好。Through hot compression experiments,true stress-true strain curves of the experimental steel were obtained under the conditions of deformation temperature of 950-1200℃,strain rate of 0.001-5 s^(-1) and the maximum true strain of 0.916.The results indicate that under the deformation conditions selected in this experiment,the new Cr-Mo-V steel appears typical dynamic recrystallization characteristic.When the deformation temperature is higher than 1050℃ and the strain rate is lower than 0.1 s^(-1),the dynamic recrystallization characteristic is more obvious.At the same deformation temperature,the peak stress and peak strain show an increasing trend with the increase of strain rate.At the same strain rate,the peak stress and steady-state stress gradually decrease with the increase of deformation temperature.The multiple linear regression method was used to obtain the Arrhenius equation model parameters corresponding to the peak stress,and the high-temperature rheological stress constitutive model for experimental steel was established based on this.The flow stress of the experimental steel was calculated by using the octave polynomial of the material constant of the constitutive equation created with different strains,the strain compensation correlation coefficient R and the average absolute relative error e AARE are 0.98902 and 3.21%,respectively,and the calculated data are in good agreement with the experimental data.

关 键 词：热作模具钢 热压缩 流变应力 本构方程 八次多项式 

分 类 号：TG115[金属学及工艺—物理冶金]