Stress relief annealing process suitable for large-size high-temperature titanium alloy curved surface or flat plate component

The invention belongs to the field of titanium-based material hot working, and particularly relates to a stress relief annealing process suitable for a large-size high-temperature titanium alloy curved surface or flat plate component. The process comprises suitable annealing times, annealing temperature, heat preservation time, cooling mode and other components. The stress relief annealing technology is adopted for conducting stress relief annealing in the numerical control machining process on the high-temperature titanium alloy forge piece, internal stress can be efficiently eliminated, meanwhile, it is guaranteed that the microscopic structure and the mechanical property of the material are stable to the maximum extent, and technical support and guarantee are provided for numerical control machining of aircraft wallboards and other parts with complex shapes and high dimensional precision; and the method can also be popularized and applied to stress relief annealing treatment in the numerical control machin