Method for manufacturing titanium alloy material by using spherical titanium alloy coarse powder

Abstract

The invention relates to a method for manufacturing a titanium alloy material by using a byproduct of 3D printing spherical titanium alloy powder, namely 53-300 [mu] m coarse powder. Comprising the following steps: screening coarse powder; hydrotreating; performing compression molding; and low-temperature sintering and post-treatment. According to the titanium alloy material manufactured through the method, the powder sintering temperature is smaller than or equal to 1150 DEG C, the oxygen content is smaller than or equal to 0.13 wt%, the thermoplastic forming performance is excellent, and ultrahigh-purity and low-cost manufacturing of the powder metallurgy titanium alloy material and parts of the powder metallurgy titanium alloy material is successfully achieved. According to the manufactured TC4 (Ti-6Al-4V) titanium alloy material, the room-temperature tensile strength is larger than or equal to 1100 MPa, the elongation at break is larger than or equal to 12%, and the fracture toughness KIC is larger than or equal to 110 MPa.m < 1 / 2 >. According to the method, the coarse powder byproduct of the 3D printing spherical titanium alloy powder is specifically developed and reutilized, the problems that the coarse spherical titanium alloy powder is difficult to press and mold and the sintering density is too low are solved, and the titanium alloy material with ultrahigh purity, high performance, low cost and high value and parts of the titanium alloy material can be manufactured.

Description

technical field [0001] The invention belongs to the technical field of titanium alloy powder metallurgy manufacturing, 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 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 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, the company will produce about 40% to 50% of coarse powder by-products, which can no longer be used for laser o...

AI Technical Summary

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%.

Images