Preparation method of titanium alloy bars
A technology for titanium alloy and rods, which is applied in the field of preparation of titanium alloy rods, can solve the problems of material plasticity reduction, uneven structure and performance of batch forgings, unqualified low-magnification structure, etc., and achieve high strength and fracture toughness. Convenient and plastic effect
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[0017] Example 1
[0018] (1) Ingot smelting: the 0 grade sponge titanium, Al-85V master alloy and industrial pure aluminum package are made into alloy packages, and then they are smelted by electrode pressing, plasma welding and vacuum consumable arc furnace more than twice to obtain specifications. It is a Φ570mm TC4-DT titanium alloy ingot; the weight percentage of each component of the TC4-DT titanium alloy ingot is Al: 6.34%, V: 4.21%, O: 0.09%, Fe: 0.05%, C: 0.02%, N : 0.012%, H: 0.007%, Ti is the balance;
[0019] (2) Using a resistance furnace, heat the TC4-DT titanium alloy ingot described in step (1) to 1200°C, and then use a 1600T fast forging machine to open blank forging in the β phase zone of the titanium alloy ingot for 2 times to obtain the forging For the billet, the forging ratio per fire time is not less than 1.3, and the final forging temperature is not less than 850℃; the phase transition temperature T of the forging billet β 980℃;
[0020] (3) Use a resistance...
Example Embodiment
[0024] Example 2
[0025] The preparation method of this embodiment is the same as that of embodiment 1, but the difference is that: the specification of the TC4-DT titanium alloy ingot is Φ650mm; the titanium alloy ingot is heated to 1150°C, and then the titanium alloy ingot is cast by a quick forging machine. Open billet forging in β phase zone to obtain forging billet for 3 times; forging billet is heated to T β After -35℃ (945℃), use a fast forging machine to repeatedly upset and draw for 6 times; the forging temperature of the forged blank after forging is T β -70℃(910℃), the system of double annealing treatment is: the first annealing temperature is T β After holding for 1 hour at -25°C (955°C), air cooling is followed. The second annealing is held at 540°C for 8 hours and then air cooling; the finished titanium alloy bar is Φ130mm.
[0026] The titanium alloy bar prepared in this embodiment has good strength, high fracture toughness and low fatigue crack growth rate.
Example Embodiment
[0027] Example 3
[0028] The preparation method of this embodiment is the same as that of embodiment 1, except that the specification of TC4-DT titanium alloy ingot is Φ720mm; the titanium alloy ingot is heated to 1175°C, and then the titanium alloy ingot is cast on a 4500T fast forging machine. Forging in the β-phase zone for 2 times to obtain the forging blank; the forging blank is heated to T β After -50°C (930°C), use a fast forging machine to repeatedly upset and draw for 3 times; the forging temperature of the forged blank after forging is T β -50℃(930℃), the system of double annealing treatment is: the temperature of the first annealing is T β After heat preservation for 1.5 hours at -50°C (930°C), it is air-cooled. The second annealing is held at 600°C for 4h and then air-cooled; the finished titanium alloy bar is Φ300mm.
[0029] The titanium alloy bar prepared in this embodiment has good strength, high fracture toughness and low fatigue crack growth rate.
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