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Rapid manufacturing method for laser remelting scanning carbide dispersion strengthened aluminum alloy

A technology of laser remelting and dispersion enhancement, which is applied in the field of additive manufacturing, can solve problems such as forming failure, and achieve the effects of improving high temperature performance, shortening manufacturing cycle, and precise manufacturing

Active Publication Date: 2015-12-02
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Spheroidization will make the metal powder unable to solidify after melting to form a continuous and smooth molten pool, so the formed parts are loose and porous, resulting in forming failure

Method used

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  • Rapid manufacturing method for laser remelting scanning carbide dispersion strengthened aluminum alloy

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Establish a complex part CAD model according to the actual application needs, and convert the model file into an STL format file for SLM processing.

[0031] (2) Weigh 1.9kg of aluminum alloy powder Al-15Si by SLM forming process. The powder is spherical or nearly spherical, the powder particle size distribution is 20-50 μm, and the oxygen content is lower than 1000 ppm; 0.1 kg of TiC powder with a purity of more than 99.9% is weighed, and the particle size distribution is 100 nm-10 μm. Under the protection of an inert gas, a ball mill is used for ball milling and mixing;

[0032] (3) The laser source is a Yb fiber laser with a wavelength of 1070±10nm, a maximum power of 400W, and a spot diameter of 0.12mm. Under the protection of argon, the mixed powder of aluminum alloy and TiC was formed in three dimensions according to the CAD model, and the remelting scanning strategy was used in the forming process. After the workpiece is cooled, remove the floating powder o...

Embodiment 2

[0035] (1) Establish a part CAD model according to the actual application needs, and convert the model file into an STL format file for SLM processing.

[0036](2) Weigh 1.8kg of aluminum alloy powder AlSi10Mg of SLM forming process. The powder is spherical or nearly spherical, the particle size distribution of the powder is 20-40 μm, and the oxygen content is lower than 1000 ppm. Weigh 0.2 kg of SiC powder with a purity of more than 99.95%, and a particle size distribution of 100 nm-10 μm. Under the protection of an inert gas, a ball mill is used for ball milling and mixing;

[0037] (3) The laser source is Yb fiber laser, the wavelength is 1070±10nm, the maximum power is 400W, and the spot diameter is 0.1mm. Under the protection of argon, the mixed powder of aluminum alloy and SiC is three-dimensionally formed according to the CAD model. During the forming process, the remelting scanning strategy is used to reduce the degree of spheroidization of the parts. After the work...

Embodiment 3

[0040] (1) Establish a part CAD model according to the actual application needs, and convert the model file into an STL format file for SLM processing.

[0041] (2) Weigh 1.98kg of aluminum alloy powder Al-20Si by SLM forming process. The powder is spherical or nearly spherical, the powder particle size distribution is 10-40μm, and the oxygen content is lower than 1000ppm. Weigh 0.02 kg of TiC powder with a purity of more than 99.99%, and a particle size distribution of 100 nm-10 μm. Under the protection of an inert gas, a ball mill is used for ball milling and mixing;

[0042] (3) The laser source is Yb fiber laser, the wavelength is 1070±10nm, the maximum power is 400W, and the spot diameter is 0.15mm. Under the protection of argon, the mixed powder of aluminum alloy and TiC is three-dimensionally formed according to the CAD model, and the remelting scanning strategy is used in the forming process to reduce the degree of spheroidization of the parts. After the workpiece i...

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Abstract

The invention discloses a rapid manufacturing method for laser remelting scanning carbide dispersion strengthened aluminum alloy. The method includes the following steps that (1) a three-dimensional part model is established on a computer, and then the three-dimensional part model is converted to be in an STL format and imported into selective area laser melting forming equipment; (2) aluminum alloy powder and carbide powder are mixed, and then are ball-milled through a ball grinder to be evenly mixed; (3) the ball-milled mixed powder is transferred into the selective area laser melting forming equipment, and the mixed powder is formed according to three-dimensional model data under the protection of inert gases; and (4) a formed part is separated from a substrate by the adoption of the wire-electrode cutting technology, and then is subjected to solution treatment in a muffle furnace, afterwards, quenching is carried out, ceramic bead sand blasting treatment is conducted, and accordingly a finished product is obtained. By the adoption of the method, dispersion strengthening phases can be evenly distributed, and therefore the purposes of obtaining the ceramic phase dispersion strengthened aluminum alloy and improving the high-temperature performance of the aluminum alloy are achieved.

Description

technical field [0001] The invention belongs to the technical field of additive manufacturing, and more specifically relates to a rapid manufacturing method of laser remelting scanning carbide dispersion reinforced aluminum alloy. Background technique [0002] Aluminum alloy is widely used in aerospace, automobile, military and civil industries because of its easy thermal conductivity, high specific strength, good fatigue resistance and corrosion resistance, and good welding performance. Although aluminum alloys have many of the above advantages and have been widely used in key fields, there are still difficulties in the rapid manufacture of aluminum alloys with light weight, complex shape and structure, and high high-temperature strength. [0003] At present, aluminum alloys with complex structures are mainly manufactured by traditional precision casting and two-dimensional sheet folding / welding methods. alloy, it is difficult to realize the forming of aluminum alloy with ...

Claims

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Application Information

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IPC IPC(8): C22C1/05C22C21/00B22F3/105C22F1/04B33Y10/00
CPCY02P10/25
Inventor 史玉升周燕魏青松滕庆周旭李伟赵晓
Owner HUAZHONG UNIV OF SCI & TECH
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