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A method for manufacturing titanium alloy material using spherical titanium alloy coarse powder

A titanium alloy and coarse powder technology, which is applied in the field of manufacturing titanium alloy materials using spherical titanium alloy coarse powder, can solve the problems of high product cost, low production efficiency, and unsuitability for large-scale production, so as to improve the density and keep the shape intact , the effect of reducing the oxygen content

Active Publication Date: 2022-07-12
NORTHEASTERN UNIV LIAONING
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Problems solved by technology

However, HIP and hot pressing sintering are close to net shape, not suitable for large-scale production, the production efficiency is relatively low, and the cost of the product is still high
The particle size of irregular element powders used in traditional powder metallurgy titanium alloys is usually less than 75 μm. Although this solves the problem of powder compression molding, the oxygen content of the manufactured titanium alloys is generally higher than 0.35wt%.

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  • A method for manufacturing titanium alloy material using spherical titanium alloy coarse powder
  • A method for manufacturing titanium alloy material using spherical titanium alloy coarse powder
  • A method for manufacturing titanium alloy material using spherical titanium alloy coarse powder

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Embodiment 1

[0051] This embodiment provides a method for manufacturing titanium alloy material using TC4 spherical titanium alloy coarse powder. The corresponding chemical composition mass ratio of the titanium alloy is: Ti-6Al-4V.

[0052] First, perform step 1 to screen out the coarse powder. The TC4 spherical titanium alloy powder produced by the plasma rotating electrode method (PREP) was vibrated and sieved, and the coarse powder with a particle size of 130-300 μm was sieved. figure 1 Shown is the SEM morphology of the sieved TC4 titanium alloy coarse powder.

[0053] Then, step 2 hydrogenation treatment is performed. The TC4 titanium alloy coarse powder with a particle size of 130-300 μm screened in the process step 1 is put into the molybdenum boat of the hydrogenation furnace for hydrogenation. The process is as follows: first vacuum to 5.0 × 10 -3 Pa, then heat up to 200°C at 8°C / min for 1 hour; then fill with hydrogen, keep the hydrogen pressure in the furnace at 0.80-0.95 b...

Embodiment 2

[0059] This embodiment provides a method for manufacturing titanium alloy material using TA15 spherical titanium alloy coarse powder. The corresponding chemical composition mass ratio of the titanium alloy is: Ti-6.5Al-2Mo-2V-2Zr.

[0060] First, perform step 1 to screen out the coarse powder. The TA15 spherical titanium alloy powder produced by the crucibleless electrode induction gas atomization (EIGA) method was vibrated and sieved, and the coarse powder with a particle size of 53-200 μm was sieved.

[0061] Then, step 2 hydrogenation treatment is performed. The TA15 titanium alloy coarse powder with a particle size of 53-200 μm screened in the process step 1 is put into the molybdenum boat of the hydrogenation furnace for hydrogenation. The process is as follows: first vacuum to 1.0 × 10 -2 Pa, heated to 250°C at 8°C / min for 1 hour; then filled with hydrogen, keeping the hydrogen pressure in the furnace at 0.90 bar, slowly heated to 650°C at 5°C / min, and kept until the ...

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Abstract

The present invention relates to a method for manufacturing a titanium alloy material using a by-product of 3D printing spherical titanium alloy powder, that is, a coarse powder of 53-300 μm. Including: screening out coarse powder; hydrogenation treatment; pressing molding; low temperature sintering and post-processing. The titanium alloy material manufactured by the invention has a powder sintering temperature of ≤1150° C., an oxygen content of ≤0.13wt%, and excellent thermoplastic forming properties, and successfully realizes ultra-high purity and low-cost manufacture of powder metallurgy titanium alloy materials and their parts. Among them, the manufactured TC4 (Ti‑6Al‑4V) titanium alloy material has room temperature tensile strength ≥1100MPa, fracture elongation ≥12%, fracture toughness K IC ≥110MPa m 1 / 2 . The invention develops and reuses the coarse powder by-product of 3D printing spherical titanium alloy powder in a targeted manner, solves the problems that the coarse spherical titanium alloy powder is difficult to be compacted and sintered with too low density, and can produce ultra-high purity, high-performance, Low-cost high-value titanium alloy materials and their components.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy manufacturing of titanium alloys, and relates to a method for manufacturing titanium alloy materials by using spherical titanium alloy coarse powder. Background technique [0002] Laser and electron beam additive manufacturing (3D printing) is an important means of short-process and near-net-shape manufacturing of titanium alloy parts with complex structures, and it is also a key technology to achieve low cost of titanium alloy parts. The particle size of spherical titanium alloy powder used in laser powder bed method 3D printing is 10-53 μm, and the particle size of spherical titanium alloy powder used in laser deposition / cladding method and electron beam 3D printing is 50-130 μm. Therefore, in the process of producing spherical titanium alloy powder for laser and electron beam 3D printing, about 40% to 50% of coarse powder by-products will be produced, which can no longer be used for l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/04C22C14/00B22F3/00B22F3/02B22F3/10B22F3/24B22F9/02B33Y70/00
CPCC22C1/0458C22C14/00B22F9/023B22F3/02B22F3/001B22F3/10B22F3/24B33Y70/00Y02P10/25
Inventor 牛红志张海瑞刘顺于金生张德良
Owner NORTHEASTERN UNIV LIAONING
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