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

Active Publication Date: 2011-11-02
西安大富宇航科技有限公司
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AI-Extracted Technical Summary

Problems solved by technology

However, for industrial production, due to the sequence of forging and die forging, the holding time of the same batch of materials is inevitably different, resulting in serious inhomogeneity in the structure and performance of the same bat...
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Abstract

The invention discloses a preparation method of titanium alloy bars. The finished titanium alloy bars are prepared through the following steps: heating prepared TC4-DT titanium alloy ingots to 1150 to 1200 DEG C; cogging and forging a beta phase zone of the ingots with a fast forging press; heating forging stocks to Tbeta-50 to Tbeta-20 DEG C through a resistance furnace; carrying out repeated upsetting and extension forging by the fast forging press; forging forged stocks to required dimensions at a forging temperature of Tbeta-70 to Tbeta-40 DEG C to obtain titanium alloy bars with uniform tissues; and carrying out duplex annealing on the obtained titanium alloy bars with the uniform tissues. The preparation method has the advantages of convenient operation, strong controllable technology, high stability of batches of prepared bars, and good repeatability. The titanium alloy bars prepared through the method of the present invention has the advantages of strong plasticity, qualified macrostructure, high strength and fracture toughness, and low fatigue crack growth rate.

Application Domain

Metal-working apparatus

Technology Topic

Titanium alloyFracture toughness +5

Image

  • Preparation method of titanium alloy bars

Examples

  • Experimental program(9)

Example Embodiment

[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 furnace to heat the forging described in step (2) to T β After -20°C (960°C), use a fast forging machine to repeatedly upset and lengthen for 5 fires. The forging ratio for each fire is not less than 2.6, the total forging ratio is not less than 10, and the final forging temperature is not less than 800°C;
[0021] (4) Use resistance furnace heating, and put the forging blank after forging in step (3) at the forging temperature of T β Forging to the required size under the condition of -40°C (940°C), the total forging ratio is not less than 3, and the final forging temperature is not less than 750°C to obtain a titanium alloy bar with uniform structure;
[0022] (5) Double-anneal the titanium alloy bar described in step (4) in a resistance furnace to obtain a finished titanium alloy bar of Φ90mm; the double annealing system is: the first annealing is at a temperature of T β After being kept at -15℃ (965℃) for 0.3h, it is air cooled. The second annealing is kept at 570℃ for 6h and then air cooled.
[0023] The titanium alloy bar prepared in this embodiment has good strength, high fracture toughness and low fatigue crack growth rate.

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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PUM

PropertyMeasurementUnit
Tensile strength>= 915.0MPa
Yield strength>= 850.0MPa
Fracture toughness>= 90.0mpa·m1/2
tensileMPa
Particle sizePa
strength10

Description & Claims & Application Information

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