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A kind of in-situ preparation method and product of laser additive manufacturing aluminum alloy

An in-situ preparation, aluminum alloy technology, applied in the field of increased material manufacturing, can solve the problems of reducing energy utilization rate and forming efficiency, and the alloy composition is difficult to meet the expected alloy properties, so as to reduce crack sensitivity, increase heat accumulation, heat less cumulative effect

Active Publication Date: 2020-08-18
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
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Problems solved by technology

[0004] However, laser additive manufacturing is a non-equilibrium solidification process, the solid solution limit of alloy elements in the base metal is greatly increased, and the alloy composition of traditional alloy grades is difficult to meet the expected alloy properties
Moreover, aluminum has extremely high laser reflectivity (91%) and thermal conductivity (237W / (mK)), and the heat accumulation during forming is less, which not only reduces energy utilization and forming efficiency, but also easily causes metallurgical defects such as pores and cracks

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  • A kind of in-situ preparation method and product of laser additive manufacturing aluminum alloy

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preparation example Construction

[0025] The specific operation steps of the preparation method of the present invention are as follows, figure 1 It is a flowchart of the preparation method constructed according to the preferred embodiment of the present invention, such as figure 1 Shown, this preparation method comprises the following steps:

[0026] (1) Use UG, Pro / E and other three-dimensional modeling software to design the three-dimensional CAD model of aluminum alloy components and convert them into STL format files for laser selective melting processing;

[0027] (2) Raw material preparation: select spherical or near-spherical aluminum alloy powders and Sc, Zr, Ti high-purity powders with an average particle size of 25-45 μm and a maximum particle size of no more than 75 μm, and store them in a vacuum environment after screening and drying ;

[0028] (3) Preparation of composite powder by ball milling method: the aluminum alloy powder and one or more high-purity powders of Sc, Zr or Ti with a total of...

example 1

[0032] This is the application of the present invention, taking the in-situ preparation and shaping of titanium / aluminum alloy materials by laser selective melting technology as an example. Specific steps are as follows:

[0033] (1) Use UG, Pro / E and other three-dimensional modeling software to design the three-dimensional CAD model of aluminum alloy components and convert them into STL format files for laser selective melting processing;

[0034] (2) Raw material preparation: Select spherical or nearly spherical aluminum alloy powder and high-purity Ti powder with an average particle size of 25-45 μm and a maximum particle size of no more than 75 μm, and store them in a vacuum environment after screening and drying;

[0035] (3) Composite powder prepared by ball milling method: the aluminum alloy powder and 2ωt.% high-purity Ti powder were mixed evenly through a ball mill. The ball milling conditions were: ball milling speed 100r / min, ball-to-material ratio 6:1, and ball mil...

example 2

[0038] This is the application of the present invention, taking the in-situ preparation and shaping of scandium / aluminum alloy material by laser selective melting technology as an example. Specific steps are as follows:

[0039] (1) Use UG, Pro / E and other three-dimensional modeling software to design the three-dimensional CAD model of aluminum alloy components and convert them into STL format files for laser selective melting processing;

[0040] (2) Raw material preparation: Select spherical or nearly spherical aluminum alloy powder and high-purity Sc powder with an average particle size of 25-45 μm and a maximum particle size of no more than 75 μm, and store them in a vacuum environment after screening and drying;

[0041] (3) Composite powder prepared by ball milling method: Aluminum alloy powder and 4ωt.% high-purity Sc powder were mixed uniformly through a ball mill. The ball milling conditions were: ball milling speed 300r / min, ball-to-material ratio 4:1, ball milling t...

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Abstract

The invention belongs to the field of additive manufacturing, and discloses an in-situ preparation method for manufacturing aluminum alloys by laser additive manufacturing. The high-purity powder and aluminum alloy powder are uniformly mixed by ball milling, and then the uniformly mixed composite powder is ball milled in an inert gas atmosphere, and the raw materials after ball milling are sieved and dried to obtain an aluminum alloy substrate; finally, the aluminum alloy substrate is loaded into a laser In the additive manufacturing equipment, under the action of the laser, the aluminum alloy powder reacts with the added Sc, Zr, Ti and other powders in situ to form nano-scale second phase particles, which are piled up layer by layer according to the preset forming path, and finally a high-quality product is prepared. Strong, crack-free high-performance aluminum alloy components. According to the invention, the prepared aluminum alloy has few metallurgical defects such as pores and cracks, and has high mechanical strength, and is suitable for manufacturing high-performance lightweight key components of aerospace.

Description

technical field [0001] The invention belongs to the field of additive manufacturing, and more specifically relates to an in-situ preparation method of aluminum alloy manufactured by laser additive manufacturing and its products. Background technique [0002] Due to the characteristics of small weight, good corrosion resistance and high specific strength, aluminum alloy has become one of the fastest and most widely used light metals in automobiles and aerospace. With the development of industrial modernization, people's requirements for the structure and performance of aluminum alloy parts continue to increase. For example, the thermal protection system in an aerospace vehicle engine must not only meet engineering requirements such as fast heat dissipation and light weight, but also have a certain load-carrying capacity. Therefore, complex structures such as lattices, fences, or honeycombs are often used. However, at present, the preparation and forming process of the above-...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/105B22F1/00B33Y10/00B33Y80/00B33Y70/00
CPCB22F1/0003B33Y10/00B33Y70/00B33Y80/00B22F2998/10B22F10/00B22F10/80B22F10/36B22F10/32B22F10/34B22F12/41B22F12/17B22F10/28B22F2009/043Y02P10/25
Inventor 宋波张金良蔡超史玉升
Owner HUAZHONG UNIV OF SCI & TECH
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