锻压技术

热机械加工Ti-6Al-4V钛合金的流变行为和显微组织演变

英文标题：Rheological behavior and microstructure evolution on Ti-6Al-4V titanium alloy by hot machining

作者：王立颖杨友刘春兰

分类号：TG146.2

出版年,卷(期):页码：2020,45(12):183-190

摘要：

采用Gleeble-3800型热模拟试验机对Ti-6Al-4V钛合金进行了变形温度为900~1100 ℃、应变速率为007~70 s-1的热压剪处理，对比分析了不同热机械加工参数下的流变行为和微观组织演变规律。结果表明：在相同的应变速率下，随着变形温度从900 ℃上升至1100 ℃，对Ti-6Al-4V钛合金的峰值应力呈现逐渐减小的趋势；而在相同变形温度下，应变速率越高则峰值应力越大。950 ℃/70 s-1变形条件下的应力-应变曲线中未出现明显的不连续屈服现象，但可见流变波动现象；而变形温度为1050和1100 ℃、应变速率为007和70 s-1时，Ti-6Al-4V钛合金的应力-应变曲线中均存在不连续屈服的现象。当变形温度为950 ℃时，应变速率敏感系数m随着应变速率的增加而增大，而其他变形温度下，m随着应变速率的增加而减小，这主要是由于Ti-6Al-4V钛合金在950 ℃/70 s-1热变形过程中发生了动态相变，而使得部分等轴α相向板条α相转变，而单相区热变形时主要发生了α相向β相的转变以及动态回复和动态再结晶，从而出现软化现象。

The Ti-6Al-4V titanium alloy was treated by hot shear-compression in thermal simulator Gleeble-3800 with the deformation temperature of 900-1100 ℃ and the strain rate of 007-70 s-1, the rheological behavior and microstructure evolution of Ti-6Al-4V titanium alloy under different processing parameters of hot machining were compared and analyzed. The results show that at the same strain rate, with the increasing of deformation temperature from 900 ℃ to 1100 ℃, the peak stress of Ti-6Al-4V titanium alloy decreases gradually, while at the same deformation temperature, the higher the strain rate is, the greater the peak stress is. However, there is no obvious ‘discontinuous yield’phenomenon in the stress-strain curve under 950 ℃/70 s-1 deformation condition, but ‘rheological fluctuation’phenomenon can be seen. When the deformation temperature is 1050 and 1100 ℃ and the strain rate is 007 and 70 s-1, there is ‘discontinuous yield’ phenomenon in the strain-strain curve of Ti-6Al-4V titanium alloy. Furthermore, when the deformation temperature is 950 ℃, the strain rate sensitive coefficient m increases with the increasing of strain rate, while at other deformation temperatures, m decreases with the increasing of strain rate. This is mainly due to the dynamic transformation of Ti-6Al-4V titanium alloy during the thermal deformation process at 950 ℃/70 s-1, which causes the partial equiaxed ɑ phase to transform into lath ɑ phase, and the transition from ɑ phase to β phase，dynamic recovery and dynamic recrystallization occur during the thermal deformation of single-phase region which resulting in softening.

基金项目：

吉林省青年科研基金（20190520037JH）；吉林省教育厅“十三五”科研基金(2019115)

王立颖（1982-），女，硕士，讲师 E-mail：wangliying0830@163com

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