Laser additive manufacturing high-strength heat-resistant rare earth aluminum alloy and preparation method thereof

A laser additive and aluminum alloy technology, which is applied in the direction of additive manufacturing, additive processing, and energy efficiency improvement, can solve the problems of uneven dispersion of the enhanced phase, low mechanical properties, complicated process, etc., and achieve complex structure , good mechanical properties and obvious strengthening effect

Pending Publication Date: 2021-05-14
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, its preparation needs to go through processes such as homogenization treatment, hot rolling, annealing, cold rolling, and cryogenic deformation. The cycle is long, the processing process is complicated and difficult to control; 1. The price of Ag elements is expensive, which increases the production cost. In addition, these elements are dense, and compound addition is not conducive to the development of lightweight; the patent does not disclose the high-temperature performance of its alloys, and has no reference and guiding significance for the service range above 400 °C
The Chinese patent application number 202010356881.6 discloses an Al-RE-Y-Mg alloy and its preparation method, and discloses a high-strength heat-resistant die-casting/high thermal conductivity and corrosion-resistant Al-RE suitable for pressure/gravity casting -Y-Mg alloy, its room temperature strength is lower than 260MPa, and its high-temperature strength at 250°C is lower than 150MPa, which is not conducive to long-term high-temperature service; and the pressure/gravity casting method has a slow solidification speed, which is prone to defects such as segregation and shrinkage porosity, and poor quality stability , affecting its performance
[0004] Traditional processing techniques mainly improve material strength by refining grains, adding second phases, or increasing d

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  • Laser additive manufacturing high-strength heat-resistant rare earth aluminum alloy and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0029] This embodiment provides a preparation method for laser additive manufacturing of high-strength heat-resistant rare-earth aluminum alloys, including: following the steps below:

[0030] S1, under the protection of high-purity argon, the aluminum ingot is heated and melted in an induction furnace to form aluminum liquid at a temperature of 730°C.

[0031] S2, add the required alloying elements to the above aluminum liquid, use the master alloy to adjust the ratio of each element to 8.00% Ce, 0.40% Mg, 0.10% Zr, 0.10% Y, 0.50% Fe, and 0.10% Si, Degassing and slag removal to make it reach the preset composition and form alloy liquid.

[0032] S3, the alloy liquid is exported by a zirconia guide tube with a diameter of 2 mm, and the alloy liquid is impacted by a high-pressure argon gas flow with a pressure of 6 MPa at the outlet of the zirconia guide tube, so that the alloy liquid forms fine particles and solidifies into a spherical alloy Powder; the average powder particl...

Embodiment 2

[0035] This embodiment provides a preparation method for laser additive manufacturing of high-strength heat-resistant rare-earth aluminum alloys, including: following the steps below:

[0036] S1, under the protection of high-purity argon, the aluminum ingot is heated and melted in an induction furnace to form aluminum liquid at a temperature of 750°C.

[0037] S2, add the required alloying elements to the above aluminum liquid, use the master alloy to adjust the ratio of each element to 10.00% Ce, 0.60% Mg, 0.20% Zr, 1.00% Y, 0.50% Fe, and 0.10% Si, Degassing and slag removal to make it reach the preset composition and form alloy liquid.

[0038] S3, the alloy liquid is exported by a silicon nitride guide tube with a diameter of 2 mm, and the alloy liquid is impacted by a high-pressure argon gas flow with a pressure of 6 MPa at the outlet of the silicon nitride guide tube, so that the alloy liquid forms fine particles and solidifies into Spherical alloy powder; the average pow...

Embodiment 3

[0041] This embodiment provides a preparation method for laser additive manufacturing of high-strength heat-resistant rare-earth aluminum alloys, including: following the steps below:

[0042] S1, under the protection of high-purity nitrogen, the aluminum ingot is heated and melted in an induction furnace to form aluminum liquid at a temperature of 750°C.

[0043] S2, add the required alloying elements to the above aluminum liquid, and adjust the ratio of each element using the master alloy: Ce is 6.00%, Mg is 0.60%, Zr is 0.20%, Y is 2.00%, Fe is 0.30%, Si is 0.10% , the content of other impurities is less than 0.1%; degassing and slag removal to make it reach the preset composition and form alloy liquid.

[0044] S3, the alloy liquid is exported by a zirconia guide tube with a diameter of 2 mm, and the alloy liquid is impacted by a high-purity nitrogen gas flow with a pressure of 6 MPa at the outlet of the zirconia guide tube, so that the alloy liquid forms fine particles an...

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Abstract

The invention provides a laser additive manufacturing high-strength heat-resistant rare earth aluminum alloy and a preparation method thereof. The preparation method comprises the following steps: an aluminum ingot is heated and molten into molten aluminum; required elements are added into the molten aluminum to form alloy liquid, specifically, the alloy liquid comprises, by mass: 1.00%-10.00% of Ce, 0.05%-2.00% of Mg, 0.10%-0.50% of Zr, 0.10%-7.50% of Y, 0.05%-0.50% of Fe, 0.10%-2.00% of Si, and the balance Fe; the alloy liquid is guided out through a flow guide pipe, the alloy liquid is impacted through air flow to form particles, and the particles are solidified into spherical alloy powder; and the spherical alloy powder is rapidly molten, solidified and formed through selective laser melting to obtain the high-strength heat-resistant rare earth aluminum alloy. The high-strength heat-resistant rare earth aluminum alloy has a nanoscale eutectic three-dimensional network skeleton structure, is high in density, has excellent room-temperature and high-temperature mechanical properties, and is relatively low in density.

Description

technical field [0001] The invention relates to the technical field of heat-resistant aluminum alloy materials, in particular to a laser additive manufacturing high-strength heat-resistant rare earth aluminum alloy and a preparation method thereof. Background technique [0002] Heat-resistant aluminum alloy has the advantages of high specific strength, low density, and good oxidation resistance, and has been widely used in aerospace, automobile, ship, weapon and other industries. However, at present, the high-temperature performance of heat-resistant aluminum alloys is close to the limit state. When the working temperature exceeds 200 °C, its mechanical properties will be significantly reduced, which makes it difficult to meet the demand for operating temperature and poses a greater safety hazard. Therefore, the development of new heat-resistant aluminum alloys with excellent room temperature performance, good oxidation resistance and fatigue resistance, and good heat resist...

Claims

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Application Information

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IPC IPC(8): C22C21/00C22C1/04B22F9/08B22F3/105B22F10/28B33Y10/00B33Y70/00
CPCC22C21/00C22C1/0416B22F9/082B22F3/105B33Y10/00B33Y70/00B22F2009/0824Y02P10/25
Inventor 高海燕吕海洋王朦朦李敏王宇飞张驰吴贇王俊孙宝德
Owner SHANGHAI JIAO TONG UNIV
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