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在热模拟机上对TB8钛合金进行了不同变形参数的双道次热模拟试验,研究了双道次热变形参数中温度和应变速率对显微组织的影响。结果表明,在单相区845℃时,显微组织表现为发生明显的动态再结晶后的等轴晶组织,变形后的组织晶粒度等级较高,晶粒明显细化。随着应变速率增大,再结晶含量降低并伴随有破碎的β晶界。两相区805℃变形后组织呈现出变形不均匀性,伴随有大量破碎的α相并且均匀度较差。随着应变速率增大,显微组织变化不明显,依然出现带状组织。跨相区热变形后的显微组织既呈现出动态再结晶后的等轴晶组织,又呈现出发生动态回复后的带状组织。温度较应变速率对带状组织的产生更为敏感。
In the thermal simulator, the TB8 titanium alloy was subjected to two-pass thermal simulation with different deformation parameters. The effects of temperature and strain rate on the microstructure were investigated. The results show that in the single phase zone at 845 ℃, the microstructure is characterized by the obvious dynamic recrystallization of the equiaxed grain structure, the deformed grain size of the higher grade, grain refinement significantly. As the strain rate increases, the recrystallized content decreases and is accompanied by broken beta grain boundaries. After deformation at 805 ° C in the two-phase zone, the microstructure shows a non-uniform deformation accompanied by a large amount of crushed α-phase and poor uniformity. As the strain rate increases, the microstructure does not change obviously, and the ribbon structure still appears. The microstructures after thermal deformation in the cross-sectional areas showed not only the equiaxed grains after dynamic recrystallization but also the bands after dynamic recovery. Temperature is more sensitive to banding than strain rate.