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Beta annealing heat treatment method for Ti6Al4V alloy forge piece

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 properties that cannot meet the requirements of specifications, and achieve low fatigue crack growth rate, high strength, simple and stable process. Effect

Active Publication Date: 2021-03-12
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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  • Beta annealing heat treatment method for Ti6Al4V alloy forge piece
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  • Beta annealing heat treatment method for Ti6Al4V alloy forge piece

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Embodiment Construction

[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 beta annealing heat treatment method for a Ti6Al4V alloy forge piece. The beta annealing heat treatment method comprises the following steps of 1, beta annealing, specifically, heating the Ti6Al4V alloy forge piece to 25-45 DEG C below a beta phase transformation point, keeping the temperature for a first heat preservation duration, heating to 25-30 DEG C above the phase transformation point, keeping the temperature for a second heat preservation duration, and starting air cooling or air cooling on the Ti6Al4V alloy forge piece within 2 minutes after furnace discharging; and 2, stress relief annealing. By means of the beta annealing heat treatment method for the Ti6Al4V alloy forge piece, the high strength, plasticity and fracture toughness and the low fatigue crack propagation rate which meet the specification requirements can be obtained, the process is simple and stable, operation is convenient, and the beta annealing heat treatment method 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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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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