一种Ti80钛合金的锻造方法，在β单相区锻造前采用分段加热方式，即可保证钛合金坯料热透，又可有效避免晶粒过分长大。本发明从相变点上到相变点下依次变形，保证每火次充分的变形量，并防止了钛合金坯料开裂。采用本发明制备的Ti80钛合金棒材，头、中、尾各部位组织均匀，初生α相呈等轴状，其含量在60％～80％之间，经相变点下100℃退火后，棒材头、中、尾部的力学性能稳定，室温抗拉强度≥900MPa，屈服强度≥750MPa，延伸率≥8％，断面收缩率≥15％，‑10℃冲击韧性≥35J/cm²，Ti80钛合金棒材的各部位组织均匀、性能稳定，满足目前海洋应用的要求。本发明还具有该方法操作简便、可操作性强的特点。

The invention provides a forging method of a Ti80 titanium alloy. A segmented heating method is adopted before forging in a beta single-phase zone so as to ensure that a titanium alloy billet is through heated and effectively avoid the excessive growth of grains. According to the forging method, the titanium alloy billet deforms sequentially from a temperature above a phase transition point to a temperature below the phase transition point, so that the sufficient deformation amount per heating number is ensured, and the cracking of the titanium alloy billet is prevented. The Ti80 titanium alloy bar prepared by the forging method has the uniform structure at head, middle and tail parts; the primary alpha phase is equiaxial, and the content of the primary alpha phase is 60%-80%; after the bar is annealed at the temperature of 100 DEG C under the phase transition point, the head, middle and tail parts of the bar have stable mechanical properties, the room temperature tensile strength is greater than or equal to 900MPa, the yield strength is greater than or equal to 750MPa, the elongation percentage is greater than or equal to 8%, the percentage reduction of area is greater than or equal to 15%, and the impact toughness at the temperature of minus 10 is greater than or equal to 35J/cm<2>; and the Ti80 titanium alloy bar has uniform structure and stable performances at each part, and meets the requirements of current marine applications. The forging method has the characteristics of simple operation and strong operability.