Secondary die forging forming method for high-temperature titanium alloy large-size curved surface component with high strength characteristic

The invention belongs to the field of titanium-based material hot working, and particularly relates to a secondary die forging forming method for a high-temperature titanium alloy large-size curved surface component with the high-strength characteristic. The method comprises suitable alloy types, a forming process, a heat treatment method and other components and optimization matching of the suitable alloy types, the forming process, the heat treatment method and the like. Three main procedures of high-temperature primary forming, medium-temperature secondary forming and low-temperature annealing treatment are adopted, the near-alpha type titanium alloy large-size curved-surface forgings, such as TA15, TA32, TA33, TA37 and TA38, with the weight being 500 kg or above are prepared through the method, and the special effects that the room-temperature strength retention rate is 97%, and the high-temperature strength retention rate is 95% can be achieved. The high-temperature titanium alloy large-size curved surfa