TA15钛合金热变形应力应变曲线及本构模型

Stress Strain Curve Correction and Constitutive Model of TA15 Titanium Alloy in Hot Deformation

摘要:

在变形温度分别为750℃、800℃、850℃、900℃、950℃、1000℃和1050℃，应变速率分别为0.001s-1、0.01s-1、0.1s-1和1s-1的条件下，对TA15钛合金进行了热压缩试验，分析了变形温度和应变速率对流动应力的影响。根据试验结果，计算了变形过程的温升，表明变形热所导致的温升大小与应变速率和应变均成正比，在 的低温高应变速率条件下所产生的温升最大，可以达到122.63℃。采用Sellars-Tegart本构模型，建立了TA15钛合金热变形时的本构模型。

Abstract:

The hot compression tests for TA15 Titanium alloy were conducted at 0.001s-1~1s-1 strain rates and 750℃~ 1050℃temperatures.The effect of deformation temperature and strain rate on the flow stress was analyzed. According to the test results, the rise temperature on the deformation process was calculated, which is proportional to strain rate and strain. The maximum temperature rise 122.63℃ is produced In the low temperature and high strain rate of .Finally, considering the thermal effect leads to deformation temperature, based on Sellars-Tegart constitutive model, the constitutive model is established for the microstructure evolution of TA15 titanium alloy at hot deformation.