高强汽车中锰钢的热压缩变形行为研究  

Hot Compression Deformation Behavior of High Strength Medium Manganese Steel for Automobile

作　　者：校振华[1] 冯亚磊[1] 冯启生 罗志辉 XIAO Zhen-hua;FENG Ya-lei;FENG Qi-sheng;LUO Zhi-hui(College of Mechanical and Electrical Engineering,Henan Vocational College of Agriculture,Zhengzhou 451450,China;School of Materials Science and Engineering,Henan University of Science and Technology,Henan Luoyang 471000,China;Luoyang Zhongzhong Casting and Forging Co.,Ltd.,Henan Luoyang 471000,China)

机构地区：[1]河南农业职业学院机电工程学院,郑州451450 [2]河南科技大学材料科学与工程学院,河南洛阳471000 [3]洛阳中重铸锻有限责任公司,河南洛阳471000

出　　处：《精密成形工程》2023年第2期125-131,共7页Journal of Netshape Forming Engineering

基　　金：河南省杰出人才创新基金(182102610014)。

摘　　要：目的为第三代汽车中锰钢工业化生产的加工工艺制定提供参考。方法采用Gleeble-3800型热力模拟试验机对汽车用中锰钢进行了变形温度900~1150℃、应变速率0.1~20 s^(-1)的热压缩变形处理(变形量为50%),基于不同热压缩变形条件下的应力应变数据建立中锰钢的流变应力本构方程,并对本构方程进行应变补偿,验证考虑应变补偿的流变应力本构方程预测值与试验结果的一致性。结果应变速率不变时,中锰钢的峰值应力随着变形温度的升高逐渐减小;变形温度不变时,中锰钢的峰值应力随着应变速率的增大整体逐渐增大。在变形温度900~1150℃、应变速率0.1~20 s^(-1)的条件下,汽车用中锰钢考虑应变补偿的流变应力的散点预测值与实测值吻合较好;进行应变补偿处理后,汽车用中锰钢流变应力本构方程的相关系数为0.986,绝对平均误差3.36%,相较于未考虑应变补偿的流变应力本构方程,考虑应变补偿后相关系数变大,绝对平均误差变小。结论考虑应变补偿的流变应力本构方程可以对汽车用中锰钢热压缩变形过程中的流变行为进行准确预测。The work aims to provide reference for the formulation of processing technology in industrial production of the third generation medium manganese steel for automobile.Gleeble-3800 thermal simulation testing machine was used to carry out the thermal compression treatment of medium manganese steel for automobile with deformation temperature of 900-1150℃and strain rate of 0.1-20 s^(-1)(The deformation amount was 50%).Based on the stress and strain data under different hot compression deformation conditions,the flow stress constitutive equation of medium manganese steel was established,and the constitutive equation was strain compensated.The consistency between the predicted values of the rheological stress constitutive equation considering strain compensation and the experimental results was verified.The results showed that when the strain rate was constant,the peak stress of medium manganese steel decreased gradually with the increase of deformation temperature;when the deformation temperature remained unchanged,the peak stress of medium manganese steel increased gradually with the increase of strain rate.At deformation temperature of 900-1150℃and strain rate of 0.1~20 s^(-1),the scattered prediction value of flow stress considering strain compensation for medium manganese steel for automobile was in good agreement with the measured value;after strain compensation treatment,the correlation coefficient of the flow stress constitutive equation of medium manganese steel for automobile was 0.986,and the absolute average error was 3.36%.Compared with the flow stress constitutive equation without considering strain compensation,the correlation coefficient became larger and the absolute average error became smaller after considering strain compensation.The rheological stress constitutive equation considering strain compensation can accurately predict the rheological behavior of medium manganese steel for automobile during hot compression deformation.

关 键 词：中锰钢 变形温度 应变速率 本构方程 应变补偿 

分 类 号：TG142.1[一般工业技术—材料科学与工程]