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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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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 batch of forgings.
Although β heat treatment and β processing technology can obtain good fracture toughness and fatigue crack growth rate, it will also cause the plasticity of the material to decrease and the low-magnification structure to fail.

Method used

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  • Preparation method of titanium alloy bars

Examples

Experimental program
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Effect test

Embodiment 1

[0018] (1) Ingot smelting: 0-grade sponge titanium, Al-85V intermediate alloy and industrial pure aluminum are packaged into alloy packages, and then successively undergo electrode pressing, plasma welding and secondary vacuum consumable electric arc furnace melting to obtain specifications TC4-DT titanium alloy ingot of Φ570mm; the weight percentage of each component of 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 and forge the titanium alloy ingot in the β-phase region for 2 fires to obtain forging For billets, the forging ratio per fire is not less than 1.3, and the final forging temperature is not less than 850°C; the phase transformation temperature T of the forged billets is β is 980°C;

[0020] (3) Adopt electric resistance furnace...

Embodiment 2

[0025] The preparation method of this example is the same as that of Example 1, except that the specification of TC4-DT titanium alloy ingot is Φ650mm; The β-phase zone is opened and forged for 3 times to obtain a forged billet; the forged billet is heated to T β After -35°C (945°C), repeat upsetting and elongating forging with a fast forging machine for 6 fires; the forging temperature of the forged billet after forging is T β -70°C (910°C), the system of double annealing treatment is: the first annealing at temperature T β Air cooling after heat preservation at -25°C (955°C) for 1 hour, and air cooling after heat preservation at 540°C for 8 hours for the second annealing; the specification of the finished titanium alloy rod prepared is Φ130 mm.

[0026] The titanium alloy bar prepared in this embodiment has good strength, high fracture toughness and low fatigue crack growth rate.

Embodiment 3

[0028] The preparation method of this example is the same as that of Example 1, except that the specification of TC4-DT titanium alloy ingot is Φ720mm; In the β phase zone, the billet is opened and forged for 2 fires to obtain the forged billet; the forged billet is heated to T β After -50°C (930°C), repeat upsetting and elongating forging with a fast forging machine for 3 times; the forging temperature of the forged billet after forging is T β -50°C (930°C), the system of double annealing treatment is: the first annealing at temperature T βAir-cooling after heat preservation at -50°C (930°C) for 1.5h, second annealing at 600°C for 4h and then air-cooling; the specification of the finished titanium alloy rod prepared 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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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.

Description

technical field [0001] The invention belongs to the technical field of alloy preparation, and in particular relates to a preparation method of a titanium alloy rod. Background technique [0002] For medium-strength and high-damage-tolerant titanium alloys, Ti-6Al-4V ELI (ultra-low interstitial) alloy is currently the most widely used abroad. This alloy is a mature typical (α + β) two-phase titanium alloy, which is developed on the basis of ordinary Ti-6Al-4V alloy. Alloy grades, such as UNS R56401, ASTM F468, Grade 23, AMS4930, Ti-64ELI in the United States, IMI318ELI in the United Kingdom, TA6VELI in France, etc. Its performance characteristics are: fracture toughness K IC Can reach 85MPa·m 1 / 2 Above, the fatigue crack growth rate is 8×10 -6 ~8×10 -5 Between mm / cycle, compared with ordinary TC4 alloy, the strength loss is 100MPa, and the strength level of the Φ100mm~Φ180mm rod is about 825MPa~875MPa, and the performance of the Φ180mm rod is reported as the measured val...

Claims

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Application Information

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IPC IPC(8): C22C1/03C22C14/00C22F1/18B21C37/04B21J1/06B21J5/00
Inventor 赵永庆陈军杨海瑛
Owner 西安大富宇航科技有限公司
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