Method for preparing nanoscale spherical Si-phase Al-Si alloy through selective laser melting

A laser melting and selective technology, which is applied in the field of metal materials, can solve the problems of low material utilization rate, small parts cannot be formed, and extremely high mold requirements, so as to shorten the production cycle and improve the fluidity.

Inactive Publication Date: 2015-02-25
NEW MATERIAL INST OF SHANDONG ACADEMY OF SCI
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  • Summary
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  • Application Information

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Problems solved by technology

Al-Si alloy is also different from other alloys (such as Fe, Ni, W and other alloys), and it is very easy to react with oxygen to form Al during smelting and casting. 2 o 3 Inclusions, leading to defects such as inclusions, pores, and segregation during solidification, which affect the density of its castings
[0003] In addition, traditional molding processe

Method used

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  • Method for preparing nanoscale spherical Si-phase Al-Si alloy through selective laser melting
  • Method for preparing nanoscale spherical Si-phase Al-Si alloy through selective laser melting
  • Method for preparing nanoscale spherical Si-phase Al-Si alloy through selective laser melting

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Embodiment 1

[0028] Nanoscale spherical Si phase Al-12Si alloy was prepared by SLM technology.

[0029] (1) Use the computer to design the CAD three-dimensional model of the required molding parts, and convert it into a data format (STL file) that can be cut. A 5mm support body is established at the bottom of the 3D model, the 3D geometric model and the support body are cut into several layers of 50 μm, and the process parameters are set for it, and finally imported into the SLM equipment.

[0030] (2) In the SLM equipment, the sealing device is evacuated and filled with Ar (purity above 99.99%) for atmosphere protection, the formed substrate is fixed on a liftable workbench, and the powder feeding system evenly spreads a layer of Al on the substrate. 12Si alloy powder.

[0031](3) According to the pre-set process parameters, the laser selectively scans the geometry of the cross-section of the corresponding layer. The specific process parameters are: laser power 200W, laser dwell time 80...

Embodiment 2

[0038] Nanoscale spherical Si phase Al-10SiMg alloy was prepared by SLM technology.

[0039] (1) Use the computer to design the CAD three-dimensional model of the required molding parts, and convert it into a data format (STL file) that can be cut. A 4mm support is established at the bottom of the 3D model, the 3D geometric model and the support are cut into several layers of 60 μm, and the process parameters are set for it, and finally imported into the SLM equipment.

[0040] (2) In the SLM equipment, the sealing device is vacuumized and filled with N 2 (the purity is more than 99.99%) for atmosphere protection, the forming substrate is fixed on a liftable workbench, and the powder feeding system evenly spreads a layer of Al-10SiMg alloy powder on the substrate.

[0041] (3) According to the pre-set process parameters, the laser selectively scans the geometry of the cross-section of the corresponding layer. The specific process parameters are: laser power 200W, laser dwell...

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Abstract

The invention relates to a method for preparing nanoscale spherical Si-phase Al-Si alloy through selective laser melting. The method comprises the steps that a CAD three-dimensional model for forming parts is designed, and is converted into a data format STL file capable of being slit, a supporting body of a certain height is built at the bottom of the three-dimensional model, the three-dimensional model and the supporting body are slit into a plurality of layers, technological parameter setting is carried out, and data and parameters are guided into SLM equipment; a sealing device is filled with inert gas for atmosphere protection after being vacuumized, a base plate is fixed to a work table capable of ascending and descending, a layer of Al-Si alloy powder is evenly laid on the base plate through a powder feeding system, corresponding cutting layers are selectively scanned according to guided-in parameter lasers, the base plate is lowered by the thickness of one layer, and a layer of new Al-Si alloy powder is evenly laid on the base plate until scanning of all the layers is finished. In the method, no mold is needed, the utilization rate of materials is high, the mechanical property of the Al-Si alloy can be improved, and the production cost of parts in a complex shape can be lowered.

Description

technical field [0001] The invention relates to a method for preparing a nanoscale spherical Si phase Al-Si alloy by using a selective laser melting technology, and belongs to the technical field of metal materials. Background technique [0002] Al-Si alloy is the cast aluminum alloy with the largest output and consumption. It has the advantages of good wear resistance and corrosion resistance, low thermal expansion coefficient, high specific strength and good thermal conductivity, which makes Al-Si alloy widely used in automobile pistons and engines. Groups, cylinder liners, hubs, bearings, bearing bushes, crankcases and other auto parts. The mechanical properties of Al-Si alloys are mainly determined by the morphology and distribution of eutectic Si in the Al matrix. There are usually a large number of needle-like or plate-like eutectic Si in the microstructure of cast Al-Si alloys, and even coarse Such a structure will severely split the Al matrix, reduce the mechanical ...

Claims

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Application Information

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IPC IPC(8): B22F3/105
CPCY02P10/25
Inventor 王小军王修春张晶伊希斌魏军
Owner NEW MATERIAL INST OF SHANDONG ACADEMY OF SCI
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