基于Z-A本构模型TC4钛合金高温流变行为的预测  

Prediction of high temperature rheological behavior of TC4 titanium alloy based on Z-A constitutive model

作　　者：沈建成[1,2] 贾海深 张继林 罗文翠 易湘斌 Shen Jiancheng;Jia Haishen;Zhang Jilin;Luo Wencui;Yi Xiangbin(Lanzhou Institute of Technology,Key Laboratory of Green Cutting Technology and Application in Gansu Province,Lanzhou 730050,Gansu,China;Gansu Province Precision Machining Technology and Equipment Engineering Research Center,Lanzhou 730050,Gansu,China)

机构地区：[1]兰州工业学院,绿色切削加工技术及应用甘肃省高校重点实验室,甘肃兰州730050 [2]甘肃省精密加工技术及装备工程研究中心,甘肃兰州730050

出　　处：《钢铁钒钛》2024年第4期76-83,共8页Iron Steel Vanadium Titanium

基　　金：甘肃省重点人才项目(甘组通字[2022]77号);甘肃省科技计划项目-重点研发(22YF7FA132);甘肃省产业支撑项目(2021CYZC-52);甘肃省高校教师创新基金项目(2024B-187);兰州工业学院“启智”人才培养计划(2018QZ-03)。

摘　　要：在描述材料承受不同变形条件下的响应行为及其热成形工艺过程优化方面,本构模型具有重要意义。因此,为了获得准确描述TC4钛合金高温流变行为的物理本构模型,利用Gleeble-3800热模拟试验机,在不同温度(550~950℃)下、不同应变速率(0.01、0.1、1 s^(-1))下完成了等温压缩试验。依据试验数据,对改进的Z-A本构模型参数进行了标定,并对其有效性进行了分析。基于分析结果,建立了一种优化的Z-A本构模型,借助相关性系数R,平均相对误差值AARE和均方根误差RSME三种统计参数,探讨了该模型的可预测性。结果表明优化的Z-A本构模型能够准确地预测该材料的高温流变行为,其模型的R、AARE和RSME分别为0.9994,1.62%和1.3248。The constitutive model plays an important role in describing the response behavior of materials under different deformation conditions and in optimizing the hot forming process.Therefore,in order to obtain the physical constitutive model for accurately describing the high temperature rheological behavior of TC4 titanium alloy,the isothermal compression experiments were performed under different temperatures(500~900℃)and different strain rates(0.01,0.1,1 s^(-1))by using the Gleeble-3800thermal simulator.According to the experimental data,the parameters of modified Z-A constitutive model are calibrated,and its effectivity is analyzed.Based on the analysis results,an optimized Z-A constitutive model was established,and the predictability of the model was discussed with the help of correlation coefficient R,mean absolute relative error value AARE and root mean square error RSME.The results indicate that the optimized Z-A constitutive model can accurately predict the high-temperature rheological behavior of the material.The R,AARE and RSME of the model are 0.9992,1.63%and1.3252,respectively.

关 键 词：TC4钛合金 高温流变行为 Z-A本构模型 

分 类 号：TF823[冶金工程—有色金属冶金] TG115.5[金属学及工艺—物理冶金]