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Aluminum alloy powder capable of being used for 3D printing and preparing method and application of aluminum alloy powder

A 3D printing, aluminum alloy technology, applied in the field of aluminum alloy powder and its preparation, can solve the problems of low strength and elongation, poor electrochemical corrosion ability, material stress corrosion, etc., to reduce the generation of oxides and reduce the content of H2O , the effect of improving performance

Active Publication Date: 2019-03-19
CRRC IND INST CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are few aluminum alloys suitable for laser 3D printing, only Al-Si alloys and Al-Si-Mg alloys with low strength and ductility, and Scalmalloy alloys developed by Airbus
[0003] Scalmalloy alloy has a tensile strength of 490MPa and an elongation of 13%, but its strengthening mechanism is single, mainly Al 3 Sc nanoparticle reinforcement
In addition, the existing 3D printed aluminum alloys still have the following problems: (1) The stress corrosion resistance is insufficient, and it is difficult to meet the corrosion resistance requirements of large aircraft and rail transit service environments
This is due to the intergranular Mg 2 Al 3 The existence of the material leads to poor stress corrosion and electrochemical corrosion ability of the material
(2) It cannot satisfy the stability and reliability of the printed components for long-term service in extremely cold and hot environments, and the creep resistance is not enough. For example, rail transit and aircraft usually need to be severely cold and hot
[0004] Although the research content about 3D printing aluminum alloys is also disclosed in the prior art, they all bring new problems more or less, and cannot solve the above problems well

Method used

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  • Aluminum alloy powder capable of being used for 3D printing and preparing method and application of aluminum alloy powder
  • Aluminum alloy powder capable of being used for 3D printing and preparing method and application of aluminum alloy powder
  • Aluminum alloy powder capable of being used for 3D printing and preparing method and application of aluminum alloy powder

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Experimental program
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Effect test

Embodiment 1

[0050] This embodiment provides a special aluminum alloy for SLM printing, which contains the following components in mass percentage: Mg: 9.00wt%; Sc: 0.80wt%; Zr: 0.55wt%; Mn: 0.50wt%; Fe: 0.01 wt%; Cu: 0.20wt%; Si: 0.05%; Zn: 1.05wt%; Cr: 0.08wt%; Ni: 0.06wt%, and the rest is Al.

[0051] Its preparation method is:

[0052] (1) Vacuum smelting, and then use argon atomization to make powder: smelting temperature is 820°C, and the pressure in the smelting furnace is 0.6MPa;

[0053] (2) Then adopt argon gas as the medium to atomize the metal droplet, and the atomization pressure is 7Mpa;

[0054] (3) The prepared powder is spherical in shape and sieved with 250 mesh to obtain a powder with an average particle size of about 25 μm. Dry the sieved powder at 90°C for 8 hours in a vacuum drying oven, which can be used for SLM printing .

[0055] After testing, the microhardness of the powder is 125Hv, the grain size inside the powder is 2μm, and the Al inside the powder 3 Sc, ...

Embodiment 2

[0057] A kind of SLM printing workpiece, the steps are as follows:

[0058] (1) Increase the heating temperature of the printing substrate to 180°C;

[0059] (2) carry out SLM printing after the selected area laser melting of the aluminum alloy powder obtained in embodiment 1;

[0060] Among them, laser power: 200W; scanning speed: 600mm / s; scanning distance: 0.05mm; powder layer thickness: 0.03mm.

[0061] The grain size of the microstructure of the obtained workpiece is 0.7 μm, and there is 3 nm of dispersed Al in the grain 3 Sc, Al 3 Zr and Al 6 Mn nanoparticles are precipitated.

[0062] The tensile property of the obtained workpiece is 485MPa, the elongation is 17%, and the stress corrosion resistance SCC is 247.

[0063] The obtained workpiece was heat-treated at 288° C. and kept in a vacuum annealing furnace for 4 hours. The tensile strength of the obtained workpiece could reach 550 MPa, the elongation rate reached 15%, and the stress corrosion resistance SCC was 2...

Embodiment 3

[0065] A special aluminum alloy for SLM printing, which contains the following components in mass percentage: Mg: 4.50wt%; Sc: 0.60wt%; Zr: 0.30wt%; Mn: 0.5wt%; Fe: 0.01wt%; Cu Si: 0.15%; Zn: 0.5wt%; Cr: 0.02wt%; Ni: 0.05wt%, and the rest is Al.

[0066] Its preparation method is:

[0067] (1) Vacuum smelting, followed by argon atomization to make powder: smelting temperature is 850°C, and the pressure in the smelting furnace is 0.5MPa;

[0068] (2) Then adopt argon gas as the medium to atomize the metal droplet, and the atomization pressure is 7Mpa;

[0069] (3) The prepared powder is spherical in shape and sieved with 250 mesh to obtain a powder with an average particle size of about 28 μm. Dry the sieved powder at 90°C for 8 hours in a vacuum drying oven, which can be used for SLM printing .

[0070] After testing, the microhardness of the powder is 145Hv, the grain size inside the powder is 4μm, and the Al inside the powder 3 Sc, Al 3 Zr、Al 2 Cu and Al 6 The size of...

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Abstract

The invention provides an aluminum alloy powder capable of being used for 3D printing and a preparing method and application of the aluminum alloy powder. The aluminum alloy powder comprises the following components including, by weight, 1.00%-10.00% of Mg, 0.10%-1.80% of Sc, 0.1%-1.60% of Zr, 0.05%-3.50% of Mn, 0.01%-0.90% of Fe, 0.01%-3.00% of Cu, 0.01%-3.00% of Si, 0.01%-3.50% of Zn, 0.01%-0.08% of Cr, 0.01%-0.08% of Ni and the balance Al. A 3D printing workpiece prepared through the aluminum alloy powder has the beneficial effect of being fine in tissue, good in mechanical property, high in stress corrosion resistance and the like.

Description

technical field [0001] The invention belongs to the field of special materials for additive manufacturing (also known as 3D printing), and specifically relates to an aluminum alloy powder that can be used for 3D printing and its preparation method and application. Background technique [0002] As a rapid manufacturing technology, laser additive manufacturing technology has become an effective way to solve the problem of forming complex high-performance precision aluminum alloy components. Laser 3D printing technology does not require machining or molds, and has the advantages of no component segregation, fine grains, high mechanical strength, high precision, and complex shapes. However, there are few aluminum alloys suitable for laser 3D printing, only Al-Si alloys and Al-Si-Mg alloys with low strength and ductility, and Scalmalloy alloys developed by Airbus. [0003] Scalmalloy alloy has a tensile strength of 490MPa and an elongation of 13%, but its strengthening mechanism...

Claims

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Application Information

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IPC IPC(8): C22C21/00C22C21/08B33Y70/00B22F9/08B33Y10/00B22F3/105B33Y80/00
CPCC22C21/00C22C21/08B22F9/082B33Y10/00B33Y70/00B33Y80/00B22F10/00B22F10/36B22F12/13B22F10/366B22F10/25B22F10/28B22F10/64Y02P10/25C22C1/0416B22F2009/0848C22C21/06
Inventor 祝弘滨李瑞迪王敏卜刘昱袁铁锤牛朋达
Owner CRRC IND INST CO LTD
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