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钛合金的晶粒尺寸对其超塑性能有着显著影响。采用三维镦拔形变热处理工艺对供货态的TC4合金进行细晶化处理,然后采用恒应变速率法对细晶TC4合金的超塑性进行了研究。结果表明:采用三维镦拔工艺能简单、有效地细化TC4合金的原始组织,平均晶粒尺寸由原始组织的50μm细化至15μm。在变形温度800～950℃,应变速率为2.2×10-4s-1的试验条件下,处理后的TC4合金均表现出良好的超塑性能,最大伸长率达到747%。
Titanium alloy grain size has a significant impact on its superplastic performance. The as-received TC4 alloy was refined by three-dimensional upsetting deformation heat treatment, and then the superplasticity of the TC4 alloy was studied by constant strain rate method. The results show that the primary structure of TC4 alloy can be refined simply and effectively by three-dimensional upsetting and drawing. The average grain size is refined from 50μm to 15μm. Under the experimental conditions of deformation temperature of 800 ~ 950 ℃ and strain rate of 2.2 × 10-4s-1, the treated TC4 alloy showed good superplasticity with a maximum elongation of 747%.