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TC4 titanium alloy selective laser melting additive manufacturing process

A laser selective melting and manufacturing process technology, applied in the field of metal additive manufacturing, can solve the problems of high internal stress of titanium alloy components, deformation of titanium alloy components, poor material shaping, etc., to improve yield strength and elongation, eliminate components The effect of deformation and high printing accuracy

Active Publication Date: 2017-12-01
湖南顶立科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since laser selective melting additive manufacturing is a rapid solidification process, there is a high internal stress in titanium alloy components, which makes the deformation of titanium alloy components very serious and the shape of the material is poor.

Method used

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Experimental program
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preparation example Construction

[0035] In the present invention, by selecting the preparation method of the above-mentioned TC4 powder and combining a specific particle size, the mechanical properties of the prepared additive manufacturing component are better.

[0036] The TC4 titanium alloy laser selective melting additive manufacturing process of the present invention includes slicing and scanning processing of formed parts.

[0037] The present invention does not limit the specific instrument models and specifications used for the slicing and scanning, as well as the specific operation methods, as long as those skilled in the art are familiar with them.

[0038] The present invention slices the formed complex structural parts; the thickness of the slice is preferably 10-30 μm; more preferably 10-28 μm; most preferably 10-25 μm; most preferably 10-20 μm; planning component scanning path, using Jiugongge scanning mode, the deflection angle when scanning layer by layer, the deflection angle is between 36-40...

Embodiment 1

[0059] (1) The material is TC4 powder, the powder particle size range is 15-53 μm, among which d10 is controlled at 18 μm, d50 is controlled at 27 μm, and d90 is controlled at 42 μm;

[0060] (2) Slicing the formed parts with a slice thickness of 20 μm; planning the scanning path of the components, using the nine-square grid method to scan, and the deflection angle when scanning layer by layer, the deflection angle is 37°;

[0061] (3) Laser selective melting equipment adopts a combination of vacuuming and replacement. Firstly, the vacuum is pumped to 80KPa, and then high-purity Ar gas is filled into the forming chamber, and the replacement is repeated several times until the oxygen content of the forming chamber is lower than 500ppm and the pressure is maintained. Start printing at 30mbar;

[0062] (4) Firstly, the substrate is preheated through the preheating function, and the preheating temperature is 150°C. After the substrate is preheated, a layer of TC4 titanium alloy po...

Embodiment 2

[0069] (1) The material is TC4 powder, the powder particle size range is 15-53 μm, in which d10 is controlled at 15 μm, d50 is controlled at 30 μm, and d90 is controlled at 45 μm;

[0070] (2) Slicing the formed parts with a slice thickness of 10 μm; planning the scanning path of the components, using the nine-square grid method to scan, and the deflection angle when scanning layer by layer, the deflection angle is 38°;

[0071] (3) Laser selective melting equipment adopts a combination of vacuuming and replacement. Firstly, the vacuum is pumped to 80KPa, and then high-purity Ar gas is filled into the forming chamber, and the replacement is repeated several times until the oxygen content of the forming chamber is lower than 500ppm and the pressure is maintained. Start printing at 30mbar;

[0072] (4) Firstly, the substrate is preheated through the preheating function, and the preheating temperature is 100°C. After the substrate is preheated, a layer of TC4 titanium alloy powde...

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Abstract

The invention provides a TC4 titanium alloy selective laser melting additive manufacturing process. The TC4 titanium alloy selective laser melting additive manufacturing process comprises the steps that A, TC4 powder is prepared, and a molding component is sliced and scanned; B, the TC4 powder is paved on a base plate, and a component is obtained through printing molding of a selective laser melting process; C, the component is subject to annealing treatment; and D, the component obtained after annealing treatment is subject to solution treatment, and a final molding component is obtained. According to the TC4 titanium alloy selective laser melting additive manufacturing process, the special selective laser melting process is adopted, the component obtained after printing molding is subject to annealing and solution treatment sequentially, and the strength of extension, the yield strength and the ductility of the finally-obtained component are obviously improved compared with other processes. Meanwhile, the component prepared through the process is subject to annealing treatment, the internal stress is sufficiently released, the problem of component deformation after printing is eliminated, and the printing accuracy is higher. Experimental results show that the strength of extension of the additive manufacturing prepared through the process exceeds 1100 MPa, the yield strength exceeds 900 MPa, and the ductility reaches 12% or above.

Description

technical field [0001] The invention relates to the technical field of metal additive manufacturing, in particular to a TC4 titanium alloy laser selective melting additive manufacturing process. Background technique [0002] Titanium alloy has many characteristics such as strong corrosion resistance, good heat resistance, low elastic modulus, and non-magnetic properties. Equivalent to ultra-high strength steel, it is widely used in aerospace, national defense, shipbuilding, biomedical, chemical, automotive and other fields. For example, the amount of titanium alloy on the US F-22 fighter plane has reached as high as 41%, while the amount of aluminum alloy and steel is only 15% and 5% respectively. [0003] However, titanium alloy has poor machinability and low material utilization rate, which has become the main technical bottleneck restricting the application of this type of alloy. Selective Laser Melting Additive Manufacturing (SLM) uses a high-energy laser beam to melt ...

Claims

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Application Information

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IPC IPC(8): B22F3/105B22F3/24B33Y10/00
CPCB22F3/24B33Y10/00B22F2003/248B22F10/00B22F10/32B22F10/28B22F10/64B22F10/36Y02P10/25
Inventor 戴煜羊建高李礼易志明吕攀
Owner 湖南顶立科技股份有限公司
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