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采用THERMECMASTOR-Z型热加工模拟试验机对魏氏和网篮组织两种TA15钛合金在α+β两相区温度750~950℃、应变速率为0.001~10s-1范围进行等温恒应变速率压缩试验,研究了原始组织对合金塑性流动行为的影响。结果表明,两种片状组织TA15钛合金的真应力-真应变曲线均呈“应变软化”型,变形温度越低、应变速率越高,流动软化程度越大,流动软化主要是片状α相的等轴化引起的。热变形参数相同时,网篮组织TA15钛合金对应的流动软化程度更大,这与两种组织热变形激活能不同造成α相的等轴化百分比不同有关。
THERMECMASTOR-Z thermal processing simulation test machine was used to fabricate two kinds of TA15 titanium alloy of Weisen and net basket under the conditions of isothermal constant strain rate compression in the range of 750-950 ℃ and strain rate of 0.001-10s-1 in the α + β two-phase region Experiments were conducted to study the influence of the original structure on the plastic flow behavior of the alloy. The results show that the true stress-strain curves of TA15 titanium alloy are both “strain softening”, the lower the deformation temperature is, the higher the strain rate is, and the higher the flow softening degree is, the softening of the flow is mainly flaky Isometric α-phase caused. When the thermal deformation parameters are the same, the flow softening corresponding to the TA15 titanium alloy basket is larger, which is related to the difference in the equiaxed percentage of the α phase due to the different thermal activation energy of the two kinds of structures.