基于摩擦和温度修正的Ti-6Al-4V钛合金热变形本构模型建立  

Establishment of thermal deformation constitutive model of Ti-6Al-4V titanium alloy based on friction and temperature correction

作　　者：吕孝根 向伟 邓浩 罗恒军 邓建伟 袁武华[2] 陈龙庆[3] LU Xiao-Gen;XIANG Wei;DENG Hao;LUO Heng-Jun;DENG Jian-Wei;YUAN Wu-Hua;CHEN Long-Qing(Deyang Wanhang Die Forging Co.,Ltd.,China Second Heavy Machinery Group,Deyang 618000,China;School of Materials Science and Engineering,Hunan University,Changsha 410082,China;Key Laboratory of Radiation Physics and Technology,Ministry of Education,Institute of Nuclear Science and Technology,Sichuan University,Chengdu 610064,China)

机构地区：[1]中国第二重型机械集团德阳万航模锻有限责任公司,德阳618000 [2]湖南大学材料科学与工程学院,长沙410082 [3]四川大学原子核科学技术研究所辐射物理与技术教育部重点实验室,成都610064

出　　处：《四川大学学报（自然科学版）》2023年第2期137-142,共6页Journal of Sichuan University(Natural Science Edition)

基　　金：四川省科技厅重点研发计划(2022YFG0102,2021YFH0174)。

摘　　要：Ti-6Al-4V是民航客机应用最广泛的中高强度钛合金,在锻造领域,数值模拟准确性依赖于高准确度的材料模型.本工作基于热压缩模拟方法,在不同变形温度(750、800、850、900和950℃)和应变速率(0.001、0.01、0.1、1和5 s^(-1))下,针对变形量为60%的Ti-6Al-4V合金,考虑鼓度因素影响,对真实应力-真实应变曲线进行了摩擦和温度修正,并进一步构建了该工况条件下的本构模型.对比实验结果,修正后的流变应力值低于实际测量值,且随着应变量和应变速率的提高、变形温度的降低,二者之间的差值也逐渐增大.本工作分别建立了Ti-6Al-4V双曲正弦式以及用Z参数表达的材料本构模型.真实应力应变曲线的摩擦和温度修正对提高材料模型的准确性具有指导意义,同时对提高数值模拟精度具有参考价值.Ti-6Al-4V is the most widely used medium to high strength titanium alloy for civil airliners.In the field of forging,the realization of reliable numerical simulation depends on a highly accurate material model.Based on the thermal compression simulation method,the present work proposes the friction and temperature corrections for the true stress-real strain curves by considering the effect of the bulge factor under different deformation temperatures(750,800,850,900 and 950℃)and strain rates(0.001,0.01,0.1,1 and 5 s^(-1)).The intrinsic model under the working condition is further constructed.The experimental results show that the original measured value is significantly higher than the corrected flow stress value,and the discrepancy between them enlarges with the increase of the strain,the decrease of the deformation temperature and the increase of the strain rate.The hyperbolic sine form and the material constitutive model expressed by Z parameter are established.The friction and temperature corrections of the true stress-strain curve are of guiding significance for improving the accuracy of the material model,and provides reference for improving the accuracy of numerical simulation.

关 键 词：TI-6AL-4V 摩擦修正 温度修正 本构模型 

分 类 号：TG142[一般工业技术—材料科学与工程]