Additive manufacturing method for reducing anisotropy and its b-added titanium alloy additive material

An additive manufacturing and anisotropic technology, which is applied in the field of B-added titanium alloy additive manufacturing materials, can solve the problems of weakening the strong plasticity of titanium alloys and the coarseness of the original β columnar grains of formed parts, so as to eliminate grain boundaries and eliminate the original β Columnar grain boundaries, effect of reducing anisotropy

Active Publication Date: 2020-01-10
芜湖舍达科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, existing studies have shown that during the laser cladding forming process of TC4 titanium alloy, due to the large temperature gradient from top to bottom inside the molten pool, the original β columnar grains of the formed part are coarse, such as figure 1 As shown, the original columnar grain boundary in the titanium alloy sample without B is clearly visible, and the α phase of the grain boundary is continuously distributed along the grain boundary; as the solidification process progresses, the β phase transforms into the α phase, especially at the original grain boundary. Distributed grain boundary α phase
The grain boundary α phase is easy to become the path of crack propagation, which weakens the strong plasticity of titanium alloy, and at the same time, the anisotropy of the formed part is prominent

Method used

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  • Additive manufacturing method for reducing anisotropy and its b-added titanium alloy additive material
  • Additive manufacturing method for reducing anisotropy and its b-added titanium alloy additive material
  • Additive manufacturing method for reducing anisotropy and its b-added titanium alloy additive material

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Experimental program
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Effect test

Embodiment 1

[0032] The mass proportion of B powder is controlled at 0.04%. Mix B powder and titanium alloy powder by mechanical powder mixing for 4 hours. The particle size of B powder is 20 μm, and the particle size of titanium alloy powder is 100 μm. Dry at 120°C in vacuum 9h; Then use the laser additive manufacturing device to perform laser cladding and molding on the above mixed powder under an argon protective atmosphere to obtain a shaped sample. The laser power is 180W, the laser spot diameter is 0.5mm, the scanning speed is 10mm / s, the powder feeding amount is 2.5g / min, the Z-axis lifting amount △Z=0.10mm, and the scanning distance is 0.2mm. Carry out wire cutting, polishing and corrosion treatment on the sample. Finally, the tissue was observed by optical microscope and scanning electron microscope, such as figure 2 As shown, the original columnar grain boundary of the sample obviously disappeared or weakened, and the α phase of the continuous grain boundary was broken and sepa...

Embodiment 2

[0034] The mass ratio of B powder is 0.05%. Mix B powder and titanium alloy powder by mechanical powder mixing for 3 hours. The particle size of B powder is 30 μm, and the particle size of titanium alloy powder is 150 μm. Dry at 120°C for 8 hours in vacuum ; and then use the laser additive manufacturing device to carry out laser cladding and molding of the above mixed powder in an argon protective atmosphere to obtain a shaped sample; then heat-treat the sample, wherein the sample is kept at 950 °C for 1 hour, and then Carry out air-cooling treatment, keep it warm at 560°C for 4 hours, and then carry out air-cooling treatment, the metallographic diagram of the obtained sample is as follows image 3 As shown, the original grain boundaries completely disappear, and the internal structure is uniform and fine lath α phase.

Embodiment 3

[0036] The mass ratio of B powder is 0.1%. Mix B powder and titanium alloy powder by ball milling for 2 hours. The particle size of B powder is 100 μm, and the particle size of titanium alloy powder is 200 μm. Dry in vacuum at 120°C for 8 hours. ; and then use the laser additive manufacturing device to carry out laser cladding and molding of the above mixed powder in an argon protective atmosphere to obtain a shaped sample; then heat treat the sample, wherein the sample is subjected to solution treatment, and the solution temperature is 970 ℃ for 2 hours, then air-cooled, and then subjected to aging treatment, the aging temperature is 600 ℃, the aging time is 6 hours, and then air-cooled to obtain a sample product.

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Abstract

The invention discloses an anisotropic additive manufacturing method and its B titanium alloy additive material, comprising the following steps: step S1, taking B powder and titanium alloy powder, wherein the mass ratio of B powder is 0.01- 0.2%, wherein the particle size of B powder is 20-100 μm, and the particle size of titanium alloy powder is 30-200 μm; Step S2, mix B powder and titanium alloy powder evenly, and dry in a vacuum environment; Step S3, use laser The material manufacturing device performs laser cladding forming on the mixed powder dried in step 2 under a protective atmosphere to obtain a formed sample. The titanium alloy prepared by the method can eliminate grain boundaries, reduce anisotropy, have excellent comprehensive mechanical properties, and improve the plasticity of titanium alloy products.

Description

technical field [0001] The invention belongs to the field of laser additive manufacturing; in particular, it relates to a B-added titanium alloy additive manufacturing material; and also relates to an additive manufacturing method capable of reducing anisotropy. Background technique [0002] As an engineering structural material widely used in aerospace, biomedical and other fields, titanium alloy has many advantages such as high specific strength, corrosion resistance, excellent high temperature stability and good biocompatibility. Using laser additive manufacturing technology, the raw materials are directly clad and formed, eliminating the need for traditional casting methods such as casting molds and demoulding, which greatly shortens the processing cycle of titanium alloy parts and greatly improves the utilization of raw materials. Rate. Therefore, the processing and forming of titanium alloys through laser additive manufacturing technology has been widely promoted in i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/00B22F3/105B22F3/24B33Y10/00B33Y70/00C22C14/00C22C32/00
CPCB22F1/0003C22C14/00C22C32/0073B22F3/24B33Y10/00B33Y70/00B22F2003/248B22F10/00B22F10/32B22F10/34B22F10/64B22F10/25Y02P10/25
Inventor 张安峰王豫跃张晓星梁朝阳李丽君霍浩
Owner 芜湖舍达科技有限公司
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