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A kind of preparation method of high-strength aluminum alloy and its powder for additive manufacturing

An additive manufacturing, aluminum alloy technology, applied in the field of high-strength aluminum alloy and its powder preparation, can solve the problems of high hot cracking tendency, low tensile and fatigue properties, sample cracks, etc., and achieve easy engineering Application, good fluidity, dense tissue effect

Active Publication Date: 2021-03-26
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The strength of the traditional high-strength 2000-series and 7000-series wrought aluminum alloys can reach 500-600MPa, but because of its wide solidification range, poor welding performance and high tendency to hot cracking
At present, the SLM manufacturing test results of these traditional high-strength aluminum alloys are not satisfactory, and the prepared samples often have crack defects, resulting in their tensile properties and fatigue properties being significantly lower than those of traditional deformed aluminum alloys, even lower than those of Al-Si The performance of the alloy
In recent years, Airbus has prepared AlMg4.5ScZrMn alloy (commercial code name) whose mechanical properties are comparable to those of deformed aluminum alloys (see: [1] A.B.Spieringset.al, Microstructure and mechanical properties of as-processed scandium modified aluminum using selective laser melting .CIRP Annals-Manufacturing Technology 65(2016) 213-216; [2] Bronke Renchowski (Airbus Defense and Space Co., Ltd.), Scandium-containing aluminum alloys for powder metallurgy technology, Chinese Patent : 201611272966.6), but because the content of the expensive element Sc in the alloy reaches more than 0.6%, the price of the alloy powder is very high, which is 3 to 4 times the price of Al-Si alloy powder, which limits its wide application

Method used

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  • A kind of preparation method of high-strength aluminum alloy and its powder for additive manufacturing
  • A kind of preparation method of high-strength aluminum alloy and its powder for additive manufacturing
  • A kind of preparation method of high-strength aluminum alloy and its powder for additive manufacturing

Examples

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Effect test

Embodiment 1

[0047] Table 1 shows the tensile properties and elastic modulus at room temperature of the additively manufactured samples of the aluminum alloy powder of Example 1 in different states.

[0048] Table 1 Room temperature tensile properties and elastic modulus (XY direction) of additively manufactured samples of Al-Si-Zn-Mg-Cu-Ni-Zr aluminum alloy powder in different states

[0049]

[0050] High-strength aluminum alloy powder for additive manufacturing with the above components by gas atomization process, such as figure 1 shown, and then sieved to select powders with a particle size of 10–60 μm for selective laser melting additive manufacturing. The additive manufacturing was carried out on the BLT-S200 selective laser melting equipment, and the test rod of Φ13×80mm was prepared. Some of the test bars were annealed at 120°C / 2h, 120°C / 24h, 165°C / 2h, 175°C / 2h, and 185°C / 2h.

[0051] According to the regulations of HB5143-1996, process the above-mentioned manufactured and ann...

Embodiment 2

[0053] Table 2 shows the tensile properties and elastic modulus at room temperature of the additively manufactured samples of the aluminum alloy powder of Example 2 in different states.

[0054] Table 2 Room temperature tensile properties and elastic modulus (XY direction) of additive manufacturing samples of Al-Si-Cu-Mg-Zr aluminum alloy powder in different states

[0055]

[0056] The high-strength aluminum alloy powder for additive manufacturing with the above components is used in the gas atomization process, and then sieved, and the powder with a particle size of 10-60 μm is selected for selective laser melting additive manufacturing. The additive manufacturing was carried out on the BLT-S200 selective laser melting equipment, and the test rod of Φ13×80mm was prepared. Some of the test bars were annealed at 120°C / 2h and 177°C / 2h respectively.

[0057] According to the regulations of HB5143-1996, process the above-mentioned manufactured and annealed test bars into Φ5mm...

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Abstract

The invention provides a method for preparing a high-strength aluminum alloy and its powder for additive manufacturing. The alloy powder is prepared by a gas atomization process. First, an intermediate frequency induction furnace is used to melt Al-Si-Zn-Cu-Mg ‑X alloy prefabricated ingots, and then powdered by supersonic gas atomization process, and powders of different specifications for additive manufacturing were prepared after sieving. The sample obtained by additive manufacturing using this high-strength aluminum alloy powder has a dense structure and no crack defects. Its tensile strength exceeds 500 MPa and elongation exceeds 3%, which is significantly better than that of additive manufacturing samples of AlSi10Mg, AlSi7Mg, and AlSi12. The strength performance is also better than that of the traditional 2000 series and 7000 series alloy additive manufacturing samples. The alloy powder can be used in the additive manufacturing method to prepare aluminum alloy parts with dense structure, complex shape and high strength, which meets the requirements of high specific strength and complex shape in the fields of aviation, aerospace and automobiles.

Description

technical field [0001] The invention relates to a preparation method of a high-strength aluminum alloy for additive manufacturing and powder thereof, and belongs to the technical field of aluminum alloy powder for metal additive manufacturing. Using the powder, the tensile strength of the sample processed by laser melting additive manufacturing process exceeds 500MPa, the elongation exceeds 3%, and the cost is relatively low. Background technique [0002] In the past five years, with the application of high-power lasers, metal additive manufacturing technology has achieved a breakthrough and rapid development. Metal additive manufacturing uses high-quality metal powder as raw material, adopts CAD model design and computer control, uses high-power laser, and manufactures parts through layer-by-layer melting. Through the use of high-power lasers and suitable process parameters, the relative density of the parts obtained through additive manufacturing can reach more than 99.5%...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C21/02C22C21/10C22C1/04B22F9/08B22F1/00B22F3/105B22F10/28B33Y70/00
CPCC22C1/0416C22C21/02C22C21/10B22F9/082B33Y70/00B22F2009/0824B22F10/00B22F1/052B22F10/34B22F10/28Y02P10/25B22F10/20
Inventor 李沛勇唐鹏钧王兴元杨斌黄粒郑卫东梁滨骞西昌李兴无
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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