(中国科学院 金属研究所钛合金研究部，沈阳 110016)
摘 要: 通过Gleeble-3800对Ti-6246钛合金进行等温单向压缩实验，在变形温度t为825~1 025 ℃、应变速率 为0.001~10 s-1时，建立锻态Ti-6246合金的热变形本构方程，采用动态材料模型(Dynamic material model, DMM)绘制出钛合金的热加工图。加工图显示2个加工失稳区(825 ℃≤t≤955 ℃， ≥0.7 s-1和955 ℃≤t≤990 ℃， ≥3 s-1)，在该合金的变形过程中应该避免功率耗散系数η的峰值，功率耗散因子的极大值出现在850~870 ℃， =0.001 s-1。
关键字: Ti-6246合金；热模拟实验；本构方程；加工图
（Titanium Alloy Laboratory, Institute of Metal Research, Chinese Academy of Science, Shenyang 110016, China）
Abstract:The flow stress behavior of Ti-6246 titanium alloy was studied using single-pass hot compression tests on Gleeble-3800 thermal simulator in temperature of 825-1 025 ℃ and strain rate of 0.001-10 s-1. The constitutive equation and the processing map of the forged Ti-6246 titanium alloy were described by the dynamic material model (DMM) based on experiment data. Ti-6246 titanium alloy is stable under conditions of t=860 ℃ and =0.001 s-1, but has poor workability under conditions of 825 ℃≤t≤955 ℃, ≥0.7 s-1 and 955 ℃≤t≤990 ℃, ≥3 s-1. The efficiency of power dissipation η reaches the highest value under temperature range of 850-870 ℃ and at strain rate of =0.01 s-1.
Key words: Ti-6246 titanium alloy; isothermal compression; constitutive equation; processing map
