Method for improving formability of high-strength aluminum alloy powder for 3D printing

A 3D printing and aluminum alloy technology, applied in the field of additive manufacturing, can solve the problems of difficult forming of Al-Mg-Sc alloys and difficult elimination of internal defects, and achieve the effect of improving alloy strength, low cost and high forming rate

Inactive Publication Date: 2020-07-03
COMAC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In view of the difficulty in forming Al-Mg-Sc alloys in the existing laser selective melting and forming and the difficulty in eliminating internal defects, the purpose of the present invention is to provide a high-strength aluminum alloy powder that is suitable for large-scale production, easy to operate, and can significantly improve 3D printing. Methods for formability and mechanical properties

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Al-Mg-Sc alloys with the following mass percentages are selected: Mg: 5%, Sc: 1%, Zr: 0.4%; Mn: 0.6%, and the rest is Al. The particle size distribution of the powder is 20-80 μm.

[0025] The forming steps of aluminum alloy parts are as follows:

[0026] (1) Use 3D software to convert the 3D model of the required workpiece into a data format that can be cut and cut into multi-layer data with a thickness of 0.06mm, and import it into the laser selective melting forming equipment;

[0027] (2) Lay a layer of alloy powder on the detachable substrate, call the program of multi-layer data described in step (1), and perform the first laser scanning along the cross section of the formed part to form a layer of selective laser melting layer;

[0028] (3) The height of the substrate does not drop, the program is called, the scanning direction is rotated 70 degrees clockwise along the scanning direction described in step (2), and the second laser scanning is performed on the so...

Embodiment 2

[0033] Embodiment 2: (comparative example)

[0034] Select the same Al-Mg-Sc-Zr alloy as in Example 1, keep the same composition and content, modify the scanning strategy, and verify the effectiveness of the scheme.

[0035] Sintering strategy: The thickness of the powder layer is 0.04mm, and a layer of alloy powder as above is spread on the substrate, and the laser is turned on to scan along the cross-section of the part. The scanning power is 350W, and the scanning rate is 1500mm / s. Spread powder and continue to scan, repeat until the part is formed. Heat treatment temperature and time are consistent with embodiment 1.

[0036] Observing the forming process, it is easy to find that with the accumulation of powder layer thickness, when the local powder state is poor and the sintering is abnormal, it cannot be adjusted in time, and eventually uneven fusion will occur, and the forming rate of the part is extremely low.

[0037] Cutting and observing the workpiece through ligh...

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Abstract

The invention discloses a method for improving formability of high-strength aluminum alloy powder for 3D printing. The method comprises the following steps that the Al-Mg-Sc-series high-strength aluminum alloy powder is prepared by using a gas atomization method in a selective laser melting forming device, wherein alloy comprises the following components of, in percentage by mass, 3%-6% of Mg, 0.1%-2% of Sc, 0.1%-0.8% of Zr, 0.2%-1% of Mn, and the balance Al. By optimizing the forming process, that is, adjusting the sintering strategy, the single-layer sintering energy density is reduced, andthe sheet layer thickness is increased to 0.04-0.07 mm; and by adopting a layer-by-layer independent sintering mode, that is, performing two-time laser scanning on single-layer alloy powder, and through second laser scanning, the alloy surface solidified after first laser scanning can be remelted, so that the non-penetration phenomenon caused by single scanning is avoided, holes and cracks in a formed part are effectively reduced, the forming rate of a workpiece is improved, and finally, the high-strength aluminum alloy workpiece with excellent comprehensive performance is obtained.

Description

technical field [0001] The invention belongs to the field of additive manufacturing and relates to a method for preparing Al-Mg-Sc series high-strength aluminum alloys by laser selective melting. Background technique [0002] Due to its advantages of low density, low cost, high specific strength, corrosion resistance, and machinability, aluminum alloys are widely used in the fields of aviation, aerospace, weapons, ships and other weapons and equipment, and are crucial to the development of modern industries. In the past hundred years, aluminum alloy components have been mainly formed by traditional processing methods such as casting and welding. Due to the precipitation of alloy elements in the matrix during solution treatment, the solid solubility of certain alloy elements is limited. The ratio is constantly being refreshed, and it is gradually difficult to meet the increasingly high requirements of the development of modern science and technology for materials. [0003] M...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/105B22F1/00B22F9/08B33Y10/00B33Y50/02C22C21/06B33Y70/00
CPCB22F1/0003C22C21/06B22F9/082B33Y10/00B33Y50/02B33Y70/00B22F10/00B22F10/36B22F12/45B22F10/366B22F10/28B22F10/64Y02P10/25
Inventor 梁恩泉常坤黄文静陈颖张曦李彬恺
Owner COMAC
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