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Selective laser melting forming method for preparing titanium alloy component

A technology of selective laser melting and titanium alloy, which is applied in the coating process and coating of metal materials, can solve problems such as deformation, cracks, warping, etc., and achieve the effect of light texture, high strength and cost saving

Active Publication Date: 2014-12-03
南京博乔机械有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the process of forming titanium alloy metal parts, there are still bottlenecks such as spheroidization, cracks, deformation, warping, and delamination, which need to be solved by scholars at home and abroad.

Method used

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  • Selective laser melting forming method for preparing titanium alloy component
  • Selective laser melting forming method for preparing titanium alloy component
  • Selective laser melting forming method for preparing titanium alloy component

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] The titanium alloy powder contains by weight: 5.5% aluminum; 6.5% graphite; 0.02% scandium, and the rest is composed of titanium and unavoidable impurities.

[0055] The above-mentioned raw material powder is mixed by ball milling. The specific ball milling parameters are: ball-to-material ratio 1:2, rotation speed 40rpm, ball milling time 4h, the powder is spherical, and the maximum particle size is 50μm.

[0056] In the present invention, SLM Solutions 250HL from Germany is preferably used. The following parameters are preferred: the output power is 180W, the scanning speed is 700mm / s, and the metal powder coating thickness is 0.25mm. The drop of each layer of the forming cylinder is 30 μm, and a mixture of 35% nitrogen and 65% argon is fed at 3 liters per minute.

[0057] After a solid layer is formed, the workbench is lowered by one layer thickness, and then a new layer to be processed is laid out from the raw materials, so that 50x50x50mm titanium alloy parts are ...

Embodiment 2

[0062] The titanium alloy powder contains, by weight percent: 6.5% aluminum; 7.5% graphite; 0.05% scandium, and the rest is composed of titanium and unavoidable impurities.

[0063] The raw material powders configured above are mixed by ball milling. The specific ball milling parameters are: ball-to-material ratio 1:3, rotation speed 70rpm, ball milling time 3h, the powder is spherical, and the maximum particle size is 50μm.

[0064] The SLM Solutions 250'HL from Germany is preferably used. The following parameters are preferred: the output power is 200W, the scanning speed is 750mm / s, and the metal powder coating thickness is 0.28mm. The drop of each layer of the forming cylinder is 35 μm, and a mixture of 40% nitrogen and 60% argon is fed at 4 liters per minute.

[0065] The titanium alloy parts produced by the selective laser melting are then cooled in stages: in the first stage, after the high temperature insulation of the selective laser melting is completed, it is coole...

Embodiment 3

[0069] The titanium alloy powder contains: 8.5% aluminum; 9.5% graphite; 0.008% scandium, and the rest is titanium and unavoidable impurities.

[0070] The above-mentioned raw material powder is mixed by ball milling. The specific ball milling parameters are: ball-to-material ratio 1:4, rotating speed 90rpm, ball milling time 2h, the powder is spherical, and the maximum particle size is 50μm.

[0071] SLM Solutions 250HL from Germany is preferably used. The following parameters are preferred: the output power is 200W, the scanning speed is 800mm / s, and the metal powder coating thickness is 0.3mm. The drop of each layer of the forming cylinder is 40 μm, and a mixture of 45% nitrogen and 55% argon is fed at 5 liters per minute.

[0072] The titanium alloy parts produced by the selective laser melting are then cooled in stages: in the first stage, after the high temperature insulation of the selective laser melting is completed, it is cooled to 950°C at 100°C per hour and kept f...

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Abstract

The invention provides a selective laser melting forming method for preparing a titanium alloy component. The method comprises the steps as follows: firstly, after being subjected to ball-milling and mixing, titanium alloy powder is delivered to a selective laser melting quick forming device, and the titanium alloy component is formed according to a component CAD image imported into the selective laser melting quick forming device; secondly, during a forming process, a mixture of 35-45% of nitrogen and 55-65% of argon is input by the flow rate of 3-5 liter per minute at the same time, a self-propagating high-temperature synthetic reaction is performed on the titanium and the nitrogen under the temperature ranging from 1220 DEG C to 1480 DEG C so as to generate titanium nitride, and titanium carbide is generated through the reaction of the titanium and the carbon in graphite under the temperature ranging from 1260 DEG C to 1523 DEG C under the argon condition; thirdly, the titanium nitride and the titanium carbide generated from the reactions are melted with the titanium alloy component as an organic whole; fourthly, the formed titanium alloy component is subjected to segmental cooling. Through adopting the technical scheme of the method, the generated titanium alloy component has better abrasive resistance and corrosion resistance, and besides, the fact that the film layers of the traditional titanium nitride and titanium carbide composite coatings are easy to peel off from the titanium alloy is avoided, and the surface of the titanium alloy is not needed to be subjected to coating and anticorrosive treatment additionally, so that the cost is saved, and no other additional processing procedures are required.

Description

technical field [0001] The invention relates to metal materials, relates to the technical field of manufacturing titanium alloy parts, in particular to a method for preparing titanium alloy parts by selective laser melting. Background technique [0002] Due to its high specific strength, good corrosion resistance, high heat resistance, and easy welding, titanium alloys are widely used in biomaterials such as aviation and prosthetic devices. However, titanium and titanium alloys have lower surface hardness and higher chemical activity. According to literature reports, the average incidence of titanium alloy implant infection is as high as 5.8%. Therefore, further improving the surface properties of titanium and titanium alloys such as corrosion resistance and high temperature oxidation resistance has become an urgent problem to be solved. In addition to improving the composition and preparation process of the alloy, it is a common method to modify the surface of titanium all...

Claims

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Application Information

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IPC IPC(8): B22F3/105B22F1/00C23C24/10
Inventor 鄢腊梅何宏周盛华
Owner 南京博乔机械有限公司
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