Effect of hot deformation parameters on the rheological behavior of two-phase region of titanium alloy
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摘要: 以热轧态Ti80合金作为基材，在Gleeble-3500热模拟测试机上进行高温压缩测试，变形温度为800～1000 ℃，应变速率为0.01～10 s−1，总变形比例为75%。结果表明：Ti80钛合金在800～950 ℃时处于α+β两相区，其流变行为受变形温度和应变速率的显著影响。Ti80钛合金的加工硬化主要来自于初始α相中位错密度的提高，变形温度的提高会导致α相的减少，流变峰值应力不断降低，过高的应变速率会导致α相内位错运动受阻。Ti80钛合金中的初始α相更容易发生动态回复和动态再结晶，随着变形温度的提高，初始α相不断减少，动态软化程度逐渐减小直至接近0。为保证钛管热轧的稳定性，应适当提高变形温度，保证Ti80钛合金热变形组织具有较高的β相体积分数，同时避免应变速率过高造成轧制载荷过大。Abstract: Hot-rolled Ti80 alloy was used as the substrate, and the high temperature compression test was carried out on the Gleeble-3500 thermal simulation tester. The deformation temperature was 800～1 000 ℃, the strain rate was 0.01～10 s−1, and the total deformation ratio was 75%. The results show that the phase of Ti80 titanium alloy was in the α+β two-phase region at 800～950 ℃, and its rheological behavior was significantly affected by the deformation temperature and strain rate. The work hardening of Ti80 titanium alloy mainly came from the increase of the dislocation density in the initial α phase. The increase of the deformation temperature led to the decrease of the α phase, and the rheological peak stress continued to decrease. And the excessively high strain rate restrained the movement of the dislocations in the α phase. The initial α phase in Ti80 titanium alloy was more prone to dynamic recovery and dynamic recrystallization. As the deformation temperature increased, the initial α phase continued to decrease, and the dynamic softening degree gradually decreased until it approached zero. In order to ensure the stability of the hot rolling of the titanium tube, the deformation temperature should be appropriately increased for obtaining a higher β phase volume fraction of the hot deformed structure in the Ti80 titanium alloy, and avoiding the excessive rolling load caused by the excessively high strain rate.
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Key words:
- titanium alloy tube /
- hot rolling /
- deformation temperature /
- strain rate /
- two-phase region /
- rheological behavior
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图 2 800～1 000 ℃时Ti80钛合金平衡相图
Figure 2. Equilibrium phase diagram of Ti80 titanium alloy at 800～1 000 ℃
图 3 不同变形温度和应变速率下的Ti80钛合金真应力—应变曲线
Figure 3. True stress-strain curves of Ti80 titanium alloy under different deformation temperatures and strain rates
图 4 不同变形温度和应变速率下的Ti80钛合金峰值应力分布
Figure 4. Peak stress of Ti80 titanium alloy under different deformation temperatures and strain rates
图 5 不同变形温度和应变速率下的Ti80钛合金峰值应变分布
Figure 5. Peak strain of Ti80 titanium alloy at different deformation temperatures and strain rates
图 6 不同变形温度和应变速率下的Ti80钛合金动态软化程度
Figure 6. Dynamic softening degree of Ti80 titanium alloy under different deformation temperatures and strain rates
表 1 Ti80钛合金化学成分
Table 1. Chemical composition of Ti80 titanium alloy
% Al Mo Sn V Ti 5.5～6.5 1.5～2.5 0.5～1.0 3.0～3.5 余量 
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