TA17钛合金热变形行为及加工图

为探索TA17钛合金热变形行为和变形特性,采用Gleeble-3800热模拟机开展温度为700~1 100℃、应变速率为0.1~40 s~(-1)、变形程度为60%的热压缩试验。基于Arrhenius模型构建TA17钛合金的本构方程,基于动态材料模型构建TA17钛合金的热加工图(ε=0.6),并结合显微组织分析对热加工图进行验证。结果表明:热加工图预测结果与组织分析相符,当温度低于750℃或者应变速率大于10 s~(-1)的区域为TA17钛合金的加工失稳区域,失稳区以外是安全加工区域,热加工性能最佳的区域是800℃、0.1 s~(-1)。

Hot Deformation Behaviors and Processing Map of TA17 Titanium Alloy

In order to study the hot deformation behaviors and deformation characteristics of TA17 titanium alloy,the thermal compression experiments were carried out on Gleeble-3800 thermal simulator at the deformation temperature ranging from 700 to 1 100 ℃,strain rate ranging from 0.1 to 40 s-1 with 60％ height reduction of the specimen.The constitutive equation of TA17 titanium alloy was established based on the Arrhenius model,and the hot processing map of the alloy,which was verified by microstructure analysis for the samples,was established based on the Dynamic Materials Model (ε =0.6).The results show that the predicted results by the hot processing map are in accordance with the microstructure analysis,indicating that the instable zones for TA17 processing locate in areas where the temperature is below 750 ℃ or the strain rate is higher than 10 s-1,and the safe processing zones are outside the instable ones with 800 ℃ and 0.1 s-1 for the processing zone possessing the best hot working performance.