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采用Gleeble-3500热模拟试验机对TA15钛合金进行等温压缩试验。根据试验获得的σ-ε曲线确定合金的再结晶体积分数,并对σ-ε曲线进行加工硬化处理确定再结晶临界应变,研究热变形条件对该合金再结晶临界应变和再结晶体积分数的影响。结果表明,动态再结晶临界应变随着变形温度的升高而减小,随着应变速率的增大而增大;动态再结晶体积分数随着变形温度的升高而增大,随着应变速率的增大而减小。TA15钛合金具有变形温度敏感性和应变速率敏感性,合理选择合金的变形温度和应变速率,可以控制合金性能及细化晶粒。
The isothermal compression test of TA15 titanium alloy was carried out by Gleeble-3500 thermal simulation testing machine. The recrystallization volume fraction of the alloy was determined according to the σ-ε curve obtained by the experiment. The σ-ε curve was hardened to determine the recrystallization critical strain. The effect of thermal deformation on the recrystallization critical strain and recrystallization volume fraction . The results show that the critical strain of dynamic recrystallization decreases with the increase of deformation temperature and increases with the increase of strain rate. The dynamic recrystallization volume fraction increases with the increase of deformation temperature. With the increase of strain rate Increase and decrease. TA15 titanium alloy with deformation temperature sensitivity and strain rate sensitivity, a reasonable choice of alloy deformation temperature and strain rate, can control the alloy performance and grain refinement.