铸态TC18钛合金热变形行为研究

Study on High Temperature Deformation of TC18 Titanium Alloy

摘要:

采用Gleeble-3800热模拟机对铸态TC18钛合金进行高温热压缩变形实验，分析该合金在变形温度1000~1150℃、应变速率0.01~10s-1和变形量为70%条件下流变应力的变化规律。确定TC18钛合金热变形激活能，建立热加工图，并通过组织观察对热加工图进行解释。综合不同应变量下的热加工图，获得了试验参数范围内热变形过程的最佳工艺参数，为铸态TC18钛合金热加工工艺优化提供理论依据。

Abstract:

Hot deformation behavior of as-cast TC18 titanium alloy has been investigated in the temperature range 1000-1150℃, the strain rate range 0.01~10 s-1 and the deformation degree was 70% by the Gleeble-3800 simulator. The deformation activation energy was evaluated; processing maps for hot working were established on the basis of variable of efficiency in power dissipation with temperature and strain rate, and interpreted according to the microstructure observation. The optimum processing parameters of hot deformation in the range of this experiment attained by different variables of the hot processing map, which can be used as a reference for hot working of as-cast TC18 titanium alloy.