对 Ti?25V?15Cr?0.2Si 阻燃钛合金在温度为950~1100°C，应变速率为0.001~1 s?1条件下进行热压缩试验，研究了该合金在β相区变形时的动态再结晶行为。结果表明，该合金的热变形机制主要是由动态再结晶支配的，而动态再结晶新晶粒主要是通过弓弯形核机制来形成的。当应变速率降低和变形温度升高时动态再结晶易于发生；当应变速率为0.01~0.1 s?1，变形温度为950~1050°C 时，动态再结晶使晶粒细化；当变形温度高于1100°C，应变速率低于0.001 s?1时，动态再结晶晶粒粗化。为了确定在不同变形条件下的动态再结晶体积分数和动态再结晶晶粒尺寸，分别建立了该合金动态再结晶动力学和动态再结晶晶粒尺寸预测模型。
Dynamic recrystallization (DRX) behavior in β phase region for the burn resistant titanium alloy Ti?25V?15Cr?0.2Si was investigated with a compression test in the temperature range of 950?1100 °C and the strain rate of 0.001?1 s?1. The results show that deformation mechanism of this alloy in hot deformation is dominated by DRX, and new grains of DRX are evolved by bulging nucleation mechanism as a predominant mechanism. DRX occurs more easily with the decrease of strain rate and the increase of deformation temperature. Grain refinement is achieved due to DRX during the hot deformation at strain rate range of 0.01?0.1 s?1 and temperature range of 950?1050 °C. DRX grain coarsening is observed for the alloy deformed at the higher temperatures of 1100 °C and the lower strain rates of 0.001 s?1. Finally, in order to determine the recrystallized fraction and DRX grain size under different deformation conditions, the prediction models of recrystallization kinetics and recrystallized grain sizes were established.
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