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Additive manufacturing method of aluminum alloy

A technology for additive manufacturing and aluminum alloys, which is applied in the field of additive manufacturing aluminum alloys, can solve problems such as inability to synchronize fusion and cooling, and decline in mechanical properties of aluminum alloys, so as to improve comprehensive mechanical properties, density and uniformity of structure Effect

Active Publication Date: 2019-05-28
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because this technology is formed by solidification and accumulation of layers of aluminum alloy powder after melting, the lower layer has been cooled and solidified during the operation process, while the upper layer is in a molten state, and the adjacent two layers cannot be fused and cooled simultaneously, resulting in joints. porosity, leading to a decrease in the mechanical properties of aluminum alloys

Method used

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  • Additive manufacturing method of aluminum alloy
  • Additive manufacturing method of aluminum alloy
  • Additive manufacturing method of aluminum alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] This embodiment will prepare Al-10Si-Mg alloy, the specific steps are as follows:

[0033] (1) Gas atomization powder making

[0034] Using pure aluminum, Al-Si master alloy, and pure Mg as raw materials, the raw materials are mixed according to the weight percentage of 10% Si, 0.4% Mg, and the balance is Al, and then smelted to form a melt. After removing slag from the melt, use 0.9-1.3MPa high-pressure nitrogen to break the melt into fine liquid droplets, solidify and cool, and classify to obtain powders with a size of 15-53 μm.

[0035] (2) Using selective laser melting technology to make the above powder into a block-shaped billet

[0036] Use the software to build the model of the aluminum alloy billet, slice and layer, and then import the data into the selective laser melting equipment. Spread the first layer of powder prepared in step (1) on the powder table in the selective laser melting equipment, and then control the laser to selectively scan the first layer...

Embodiment 2

[0044] This embodiment will prepare Al-6Mg-0.3Sc alloy, the specific steps are as follows:

[0045] (1) Gas atomization powder making

[0046] Using pure aluminum, Al-Sc intermediate alloy and pure Mg as raw materials, the raw materials are mixed according to the weight percentage of 6% Mg, 0.3% Sc, and the balance is Al, and then smelted to form a melt. After removing slag from the melt, use 0.9-1.3MPa high-pressure nitrogen to break the melt into fine liquid droplets, solidify and cool, and classify to obtain powders with a size of 15-53 μm.

[0047] (2) Using selective laser melting technology to make the above powder into a block-shaped billet

[0048] Use the software to build the model of the aluminum alloy billet, slice and layer, and then import the data into the selective laser melting equipment. Spread the first layer of powder prepared in step (1) on the powder table in the selective laser melting equipment, and then control the laser to selectively scan the first...

Embodiment 3

[0056] The selective laser melting technology is to melt the aluminum alloy powder layer by layer, and then rapidly cool and solidify layer by layer. connection between. In addition to improving the bonding between two adjacent layers by means of external force, the cold deformation processing means used in Examples 1 and 2 can also be improved from the inside. Therefore, the applicant attempted to change the microstructure of the joint between two adjacent layers to increase the joint strength between the two, thereby improving the uniformity and density of the aluminum alloy. This embodiment takes the preparation of Al-10Si-Mg alloy as an example, and the specific preparation steps are as follows:

[0057] (1) Gas atomization powder making

[0058] Same as in Example 1, in this example, after the aluminum alloy raw materials are smelted together into a melt, the melt is broken into fine droplets by using high-pressure inert gas, and solidified and cooled to form a powder. ...

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Abstract

The invention provides an additive manufacturing method of aluminum alloy. The additive manufacturing method of the aluminum alloy comprises the following steps that (1) conducting gas atomization powder manufacturing, wherein after aluminum alloy raw materials are molten together into a melt, high-pressure inert gas is adopted to crush the melt into tiny liquid drops, and powder is formed after solidification and cooling; (2) making the powder into a blocky blank by means of a selective laser melting technology; (3) conducting cold deformation machining, wherein plastic processing is conducted on the blank in the step (2), so that a deformed blank is obtained; (4) heat treatment is conducted on the deformed blank, so that aluminum alloy is obtained. According to the additive manufacturingmethod of the aluminum alloy, on the basis of the selective laser melting technology, deformation processing treatment is added, residual pores existing in the selective laser melting process can beremoved, and the density and structure uniformity of the aluminum alloy can be improved, so that the comprehensive mechanical performance of the aluminum alloy can be improved; rolling, extrusion andforging are conducted at the indoor temperature, so that the fine structure in the blank cannot be coarsened.

Description

technical field [0001] The invention relates to the technical field of metal material preparation, in particular to a preparation method for additively manufacturing aluminum alloys. Background technique [0002] Aluminum alloy has the advantages of low density, high specific strength, good corrosion resistance, excellent processing and formability, and low cost. It is the most widely used non-ferrous metal structural material in modern industry. In particular, high-performance aluminum alloys are crucial to the fields of aviation, aerospace, weapons, ships and other weapons and equipment. For example, in the aviation field, a large number of complex overall structural parts processed by aluminum thick plates replace the components assembled with many parts before. , not only can reduce the structural weight, improve the load capacity and range, but also high-performance aluminum alloy can ensure the stability of aircraft performance, mainly used for landing gear, engine com...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/04B22F3/105B22F3/24B33Y10/00
CPCY02P10/25
Inventor 蔡志勇王日初马如龙周朝辉李晓庚曹玄扬
Owner CENT SOUTH UNIV