基于应变补偿Arrhenius模型的TC20钛合金本构方程研究  

Study on Constitutive Equations of TC20 Alloy Based on Strain-compensated Arrhenius Model

作　　者：毛欢 韩莹莹[2] 

机构地区：[1]航空工业西安飞机工业(集团)有限责任公司热表处理厂,陕西阎良710089 [2]北京北方车辆集团有限公司车辆研究院,北京100072

出　　处：《铸造技术》2018年第9期1939-1942,1947,共5页Foundry Technology

摘　　要：通过热压缩模拟机对TC20钛合金进行热压缩试验,对不同温度和应变速率下的试样进行加载,获得高温应力应变曲线。结果表明,在试验参数范围内,变形温度越低,应变速率越高,流动应力越高,具有明显的应变速率强化和高温软化现象;应力应变曲线呈先升高后下降趋势,发生了动态再结晶软化;基于应变补偿Arrhenius模型回归建立了TC20钛合金的高温本构方程。对比分析发现所建立的模型具有较好的预测性能,平均相对误差为12.1%。The hot compression tests were carried out by isothermal hot compression tester for hot deformation of TC20 titanium alloy. The stress-strain data were obtained in a wide range of temperatures and strain rates. The results show that the strain rate is higher and the flow stress is higher when the deformation temperature is lower. which has obvious strain rate strengthening and high temperature softening. The stress and strain curve show a trend of first rising and then falling,and dynamic recrystallization softening will occur. The high temperature constitutive equation of TC20 titanium alloy will be established based on strain compensated Arrhenius model regression. The results show that the model has good prediction performance and the average relative error is 12.1%.

关 键 词：热模拟压缩 TC20合金 本构方程 加Thenius模型 

分 类 号：TG146.2[一般工业技术—材料科学与工程]