(宝鸡钛业股份有限公司，宝鸡 721014)
摘 要: 研究Ti-6Al-4V钛合金在高温高速状态下连续塑性变形过程中各道次变形量、变形速度与轧件温度变化的关系，以及轧制后的微观组织形态。结果表明：在Ti-6Al-4V钛合金线棒材的轧制过程中，不同的轧制阶段，由于轧件单道次变形量、轧制速度的改变，坯料的变形温度有升有降，初轧和中轧阶段变形温度总的变化趋势是降低的，但变化趋势比较缓慢，从预精轧开始，随着轧制速度的提高，坯料变形温度逐渐上升；坯料在相变点温度以上加热开轧时，终轧温度控制在两相区内，轧制组织为细小等轴状α+β两相组织，横、纵向的微观组织相差不大，符合GB/T 13810—2007附录A《两相钛合金金相组织分类评级图》中 A2级标准。
关键字: 钛合金；轧制；温度变化；显微组织
（Baoji Titanium Industry Co., Ltd., Baoji 721014, China）
Abstract:The relationship among deformation, speed, temperature shift, and the microstructure of Ti-6Al-4V alloy bars after continual rolling were discussed. The results show that during the rolling process, temperature of alloy bars changes continually at different process stages with the change of deformation and speed. The changing tendency is not obvious but slow, generally speaking, the temperature goes down gradually. After preliminary precision rolling, the temperature goes up because of the increasing rolling speed. Bars are heated above the phase transition temperature, and the finishing temperature shall be controlled at α+β phase region. Then the microstructure of the α+β phase of rolled bars is fine and equiaxed. The microstructure at both transverse and longitudinal direction is the same, and can meet with Grade A2 of Chinese standard GB/T 13810—2007.
Key words: titanium alloy; rolled; temperature shift; microstructure
