GH4169合金高温变形过程本构方程  

Constitutive Equation for High-Temperature Deformation of GH4169 Alloy

作　　者：吴昊[1] 孔祥伟[2] 罗平 WU Hao;KONG Xiang-wei;LUO Ping(Engineering Training Center,University of Science and Technology,Liaoning Anshan114051,China;School of Mecha-nical Engineering&Automation,Northeastern University,Liaoning Shenyang110819,China;Technology R&D Center,ChuTian Technology Co.,Hu’nan Changsha410600,China)

机构地区：[1]辽宁科技大学工程训练中心,辽宁鞍山114051 [2]东北大学机械工程与自动化学院,辽宁沈阳110819 [3]楚天科技股份有限公司技术研发中心,湖南长沙410600

出　　处：《机械设计与制造》2020年第8期163-167,共5页Machinery Design & Manufacture

基　　金：国家自然基金—辽宁省联合基金大型复杂机械结构疲劳全寿命可靠性理论及方法研究(U1708255)。

摘　　要：使用MMS-300热模拟实验机对GH4169合金在变形温度950℃,980℃,1000℃,1020℃,1040℃,1060℃,1100℃及变形速率0.01mm/s,0.1mm/s,1mm/s,10mm/s条件下进行压缩实验。其中,压下率为50%。在热压缩变形过程中,当温度升高或变形速率减小时,流变应力降低。根据不同的热变形参数对流变应力的影响,利用线性回归的方法分析了Arrhenius形式的本构方程,并求出激活能Q=505.649kJ/mol。最终,建立描述GH4169合金热变形规律的本构方程并分析其预测精度。结果表明:在不同热变形参数下,其流变应力的预测值与实验值的符合程度良好,平均相对误差为5.13%,线性相关度为0.977。Compression experiments of GH4169 alloy were performed at deformation temperatures of 950℃,980℃,1000℃,1020℃,1040℃,1060℃,1100℃ and deformation rates of 0.01 mm/s,0.1 mm/s,1 mm/s and 10 mm/s by using the MMS-300 thermal simulation machine. Moreover,the reduction ratio was 50%.In the process of hot compressive deformation,the flow stress decreased as the temperature increased or the deformation rate decreased. According to the effect of different thermal deformation parameters on flow stress,the Arrhenius type constitutive equation was analyzed by linear regression method,and the activation energy was determined as Q=505.649 kJ/mol. Finally,the constitutive equation describing the hot deformation rule of GH4169 alloy was set up,which its prediction accuracy was analyzed. The results showed:under different thermal deformation parameters,the predicted values of flow stress agreed well with the experimental values,with an average relative error of 5.13% and a linear correlation of 0.977.

关 键 词：GH4169合金 热变形参数 Arrhenius形式 本构方程 误差分析 

分 类 号：TH16[机械工程—机械制造及自动化] TH142.2[一般工业技术—材料科学与工程]