A β-annealing heat treatment method for ti6al4v alloy forgings

An annealing heat treatment, ti6al4v technology, applied in the field of heat treatment of metal materials, can solve the problems of low fatigue crack growth rate, microstructure and performance that cannot meet the specification requirements, etc., and achieve small loss of plastic index, standard grain size and uniform structure Effect

Active Publication Date: 2021-11-02
SHAANXI HONGYUAN AVIATION FORGING
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Problems solved by technology

[0006] The object of the present invention is: provide a kind of Ti6Al4V alloy forging β annealing heat treatment method, the Ti6Al4V alloy forging processed by the present invention not only has the microstructure that meets the requirements, higher strength, but also obtains the plasticity index that satisfies the requirements and high Fracture toughness, and low fatigue crack growth rate, solve the problem that the microstructure and properties in the existing process cannot meet the specification requirements

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  • A β-annealing heat treatment method for ti6al4v alloy forgings
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  • A β-annealing heat treatment method for ti6al4v alloy forgings

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[0030] figure 1 A schematic flow sheet of the Ti6Al4V alloy forging β annealing heat treatment method provided by an example of the present invention, as figure 1 As shown, the β annealing heat treatment method for Ti6Al4V alloy forgings includes:

[0031] The first step: beta annealing

[0032] Heat the wrought Ti6Al4V alloy to 25°C-45°C below the β-transition point, keep it warm for 60-120 minutes, then take 35-45 minutes to raise the temperature to 25-30°C above the transformation point, hold it for 40-60 minutes, and leave the furnace Finally, transfer and disperse the forging within 2 minutes, and carry out air cooling or blowing cooling.

[0033] The second step: stress relief annealing.

[0034] figure 2 A schematic diagram of the microstructure of a heat-treated Ti6Al4V alloy forging provided for an example of the present invention. In this example, a Ti6Al4V alloy forging with an external dimension of 768.3×575×172.5 is used, and its effective thickness is 45mm, ...

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Abstract

The invention provides a β-annealing heat treatment method for Ti6Al4V alloy forgings, which includes the following steps: the first step: β-annealing: heating the Ti6Al4V alloy forgings to 25°C-45°C below the β-transition point, keeping the temperature for the first time, and then raising the temperature To 25 ℃ ~ 30 ℃ above the phase transition point, heat preservation for the second heat preservation time, and start air cooling or blowing cooling of the Ti6Al4V alloy forging within 2 minutes after being out of the furnace; the second step: stress relief annealing. The β-annealing heat treatment method for Ti6Al4V alloy forgings provided by the invention can obtain higher strength, plasticity and fracture toughness meeting specification requirements, lower fatigue crack growth rate, simple and stable process, convenient operation, and is suitable for industrial production.

Description

technical field [0001] The invention belongs to the technical field of heat treatment of metal materials, and in particular relates to a method for beta annealing heat treatment of a Ti6Al4V alloy forging. Background technique [0002] Ti6Al4V is a typical two-phase titanium alloy with low density, high strength and fatigue strength. It is widely used in aviation, aerospace and other fields. The material has changed from simply satisfying the traditional static strength design to the damage tolerance design criterion. The damage tolerance design is to ensure the safety of important components with cracks or possible cracks, and puts forward requirements for fracture toughness and fatigue crack growth resistance. [0003] Beta heat treatment of titanium alloy is one of the main technical ways to obtain titanium alloy with high damage tolerance, because the lamellar structure of titanium alloy obtained after annealing in β zone is the same as that obtained by heat treatment in...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/18C21D1/26C21D1/30
CPCC21D1/26C21D1/30C22F1/183
Inventor 师周龙谭海波孙亚利崔明磊魏志英张书美
Owner SHAANXI HONGYUAN AVIATION FORGING
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