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利用Gleeble-3500热模拟试验机,在变形温度为1181~1341 K及应变速率为0.01~10 s~(-1)参数范围内对TC4-DT钛合金进行等温恒应变速率压缩试验。基于加工图理论分析了不同应变条件下应变速率敏感因子、功率耗散因子及失稳区的区别与联系,分析加工图发现:TC4-DT钛合金在1181~1341 K,应变速率为0.01~0.79 s~(-1)之间主要发生动态再结晶/动态回复(DRV/DRX),此区间对应的能量耗散效率大致为45%,当变形发生在温度1181~1211 K,较高应变速率(>1 s~(-1))下,对TC4-DT钛合金加工时易发生流变不稳定现象。
The isothermal constant strain rate compression test of TC4-DT titanium alloy was carried out with the Gleeble-3500 thermal simulator at a deformation temperature of 1181-1341 K and a strain rate of 0.01-10 s -1. Based on the processing diagram theory, the differences and relations between the strain rate sensitivity factor, power dissipation factor and the destabilization zone under different strain conditions were analyzed. The processing diagram was found that the strain rate of TC4-DT titanium alloy was between 1181 and 1341 K and the strain rate was between 0.01 and 0.79 The dynamic recrystallization / dynamic recovery (DRV / DRX) mainly occurs between s ~ (-1) and the energy dissipation efficiency corresponding to this interval is about 45%. When the deformation occurs at the temperature of 1181 ~ 1211 K, the higher strain rate > 1 s ~ (-1)), TC4-DT titanium alloy is prone to rheological instability.