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Method and device for 3D printing of gamma-TiAl alloy in static magnetic field

A 3D printing, static magnetic field technology, applied in the direction of additive manufacturing, additive processing, etc., can solve the problems of small laser three-dimensional forming structure, difficult laser three-dimensional forming, and increase the process flow, so as to reduce the risk of cracking, the solidification structure is small, and flexible. high effect

Inactive Publication Date: 2021-06-01
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the poor room temperature plasticity of γ-TiAl alloys, it is difficult to use laser stereoforming. The γ-TiAl alloys prepared by conventional 3D printing devices are prone to cracking from the bottom, and even along the construction direction to the top. Cracks caused by excessive stress
Most of the existing reports use a higher preheating temperature to obtain a dense γ-TiAl alloy during 3D printing, which not only increases the process flow, but also increases the production cost. The γ-TiAl alloy obtained by melting technology is similar, and loses the advantage of fine structure of laser three-dimensional forming

Method used

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  • Method and device for 3D printing of gamma-TiAl alloy in static magnetic field
  • Method and device for 3D printing of gamma-TiAl alloy in static magnetic field
  • Method and device for 3D printing of gamma-TiAl alloy in static magnetic field

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Preparation of titanium alloy substrate: select TC4 alloy as the substrate material, cut it into a plate, perform sandblasting on the plate and then clean it with ethanol to obtain a titanium alloy substrate with a smooth and clean surface.

[0051] Preparation of pre-alloyed powder: use Ti-48Al-2Cr-2Nb alloy powder, the alloy powder atomic percentage content is: 48% Al, 2% Nb, 2% Cr, the balance is Ti and unavoidable impurities, O The N content is 533ppm, the N content is 481ppm, the particle size distribution range of the alloy powder is 53-150μm, and the D50 is 88.6μm; the pre-alloyed powder is put into a vacuum oven and baked at 100°C for 2 hours to obtain a dry pre-alloyed powder.

[0052] The laser used in the 3D printing device is a 2000W fiber-coupled semiconductor laser from Laserline, Germany.

[0053] The method for 3D printing gamma-TiAl alloy consists of the following steps:

[0054] (1) Put the pre-alloyed powder into the powder feeder, and adjust the po...

Embodiment 2

[0065] The temperature in step (3) of Example 1 was changed to 350°C, the magnetic field strength in step (5) was changed to 0.5T, and the parameters of 3D printing in step (7) were changed to: laser scanning speed 8mm / s, laser power 1200W , the powder feeding gas flow rate is 8L / min, the lifting amount of the laser cladding head is 1.5mm, and other conditions are the same as in Example 1.

Embodiment 3

[0067] Such as figure 1 As shown, the device for 3D printing γ-TiAl alloy provided in this embodiment includes a substrate heating device 1, a titanium alloy substrate 2, a magnet device 3, a laser 4, a powder feeder 5, a laser cladding head 6, a water cooling system 7, Numerical control system 8 and gas circulation system 9;

[0068] The exterior of the substrate heating device 1 is provided with a coating formed of a high-permeability shielding alloy;

[0069] The magnet device 3 includes two static magnets, and the two static magnets are relatively arranged on both sides of the nozzle of the laser cladding head;

[0070] The laser 4 is a fiber laser;

[0071] The substrate heating device 1, titanium alloy substrate 2 and laser cladding head 6 are located inside the forming chamber; the traveling system of the numerical control system 8 is located inside the forming chamber, and the console of the numerical control system 8 is located outside the forming chamber;

[0072]...

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Abstract

The invention provides a method for 3D printing of a gamma-TiAl alloy in a static magnetic field. 3D printing is carried out on pre-alloyed powder according to three-dimensional data of a gamma-TiAl alloy formed part to obtain the gamma-TiAl alloy, and 3D printing is carried out in the static magnetic field. When the gamma-TiAl alloy is prepared, an external magnetic field is applied to obtain the compact high-performance gamma-TiAl alloy, and the external magnetic field can further improve the internal structure form of the alloy, reduce residual stress, obtain higher mechanical properties and reduce the cracking risk which may be caused by subsequent heat treatment; and the gamma-TiAl alloy prepared through a 3D printing technology has the characteristics of being high in flexibility, high in material utilization rate, short in production period and the like, and the solidification structure in the gamma-TiAl alloy is small. The result of the embodiment shows that the tensile strength of the gamma-TiAl alloy prepared through the method is larger than 560 MPa, the hardness is larger than 420 HV, and the ductility ranges from 0.5% to 0.8%.

Description

technical field [0001] The invention relates to the technical field of metal additive manufacturing, in particular to a method and a device for 3D printing a γ-TiAl alloy under a static magnetic field. Background technique [0002] γ-TiAl alloy has excellent mechanical properties, and has excellent flame retardancy and low density. It is a potential substitute material for the manufacture of new low-pressure turbine engines. However, due to its low room temperature plasticity, ordinary processing and forming methods are used. Difficult to process it. The structure of the γ-TiAl alloy obtained by traditional casting is relatively coarse, and it needs to be quenched and aged. However, the γ-TiAl alloy is prone to quenching cracks during quenching, and the titanium-aluminum alloy has the characteristics of poor cutting performance and damage to the blade. It is extremely cost-intensive to manufacture it subtractively. [0003] At present, most of the internal structures obtai...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F10/25B33Y10/00B33Y30/00
CPCB33Y10/00B33Y30/00B22F2999/00
Inventor 王江任忠鸣陈超越曹庭玮帅三三胡涛玄伟东李传军
Owner SHANGHAI UNIV
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