论文部分内容阅读
采用Gleeble3500对TB8钛合金进行等温恒应变速率热模拟压缩试验,研究该合金在温度750~900℃、应变速率0.001~10 s-1热变形参数范围内基于Murty判据的加工图,并分析TB8钛合金的热变形行为。结果表明:TB8钛合金的失稳变形区为:温度750~780℃,应变速率0.03~10 s-1;温度780~900℃,0.35~10 s-1,发生失稳变形后的组织特征为局部流动及β相晶粒的不均匀变形。较佳的稳定变形区为:温度815~885℃、应变速率0.03~0.1 s-1,发生稳定变形后的组织为动态再结晶后的等轴组织。结合预测的稳定变形区及显微组织特征可知,在单相区850℃变形时,0.1 s-1作为动态回复及动态再结晶的临界应变速率。
Using Gleeble3500 thermal simulative compression test of TB8 titanium alloy at constant temperature and constant strain rate, the working process of the alloy was studied based on the Murty criterion in the temperature range of 750 ~ 900 ℃ and strain rate of 0.001 ~ 10 s-1, and TB8 Titanium alloy thermal deformation behavior. The results show that the instability deformation zone of TB8 titanium alloy is 750-780 ℃, strain rate 0.03-10 s-1, temperature 780-900 ℃, 0.35-10 s-1, Local flow and non-uniform deformation of β-phase grains. The preferred stable deformation zone is: the temperature is 815 ~ 885 ℃, the strain rate is 0.03 ~ 0.1 s-1, and the structure after stable deformation is the equiaxed structure after dynamic recrystallization. According to the predicted stable deformation zone and the microstructure characteristics, 0.1 s-1 is taken as the critical strain rate of dynamic recovery and dynamic recrystallization when the single-phase zone is deformed at 850 ℃.