Forging method for equal-atomic-ratio titanium-nickel alloy large cast ingot

The invention discloses a forging method for an equal-atomic-ratio titanium-nickel alloy large cast ingot. The titanium-nickel alloy large cast ingot is subjected to homogenization treatment, the technological parameter is 930-980 DEG C, and heat preservation time is 10-12 h, and air cooling is conducted; the air-cooled titanium-nickel alloy large cast ingot is subjected to the first heating number of forging, the heating temperature is 900-920 DEG C, heat preservation is conducted for 4-5 h, deformation is phi460-phi320, the strain rate is (0.05-0.10) s , and a forging blank is obtained after the first heating number in a breaking mode; the forging blank is subjected to the second heating number of forging, the heating temperature is 880-900 DEG C, heat preservation is conducted for 3-3.5 h, deformation is phi320-phi200, the strain rate is (0.10-0.25) s , and the forging blank is obtained after the second heating number in a breaking mode; and the forging blank is subjected to the third heating number of for