Method for preparing high strength and ductility magnesium-rare earth alloy through selective laser melting additive manufacturing technology

A technology of selective laser melting and magnesium-rare-earth alloys, which is applied in the direction of additive manufacturing, additive processing, and energy efficiency improvement. It can solve the problems of grain and eutectic phase coarseness, inclusion mechanical properties, composition segregation, etc. Low phase content, good product stability, and improved structure

Active Publication Date: 2020-01-14
SHANGHAI JIAO TONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to fill the gap in the field of selective laser melting preparation of existing Mg-RE-(Zn)-Zr alloys, to provide a method for preparing high-strength and tough magnesium rare earth alloys by selective laser melting addit

Method used

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  • Method for preparing high strength and ductility magnesium-rare earth alloy through selective laser melting additive manufacturing technology
  • Method for preparing high strength and ductility magnesium-rare earth alloy through selective laser melting additive manufacturing technology
  • Method for preparing high strength and ductility magnesium-rare earth alloy through selective laser melting additive manufacturing technology

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Example Embodiment

[0039] Example 1

[0040] This embodiment provides a method for preparing a high-strength and tough magnesium rare earth alloy by selective laser melting additive manufacturing technology, which specifically adopts the following steps:

[0041] 1) Prepare Mg-11.16Gd-1.72Zn-0.44Zr (wt.%) alloy powder by gas atomization, and sieve the alloy powder, select 300-500 mesh (average particle size is 42 μm) powder Perform selective laser melting molding.

[0042] 2) Put the powder into the powder bed of the selective laser melting equipment after drying at 200°C / 5h in a vacuum drying box, preheat the substrate to 200°C, pass in the protective gas argon for gas circulation, and wait for the molding chamber When the oxygen and water vapor content in the room is lower than 100ppm, the selective laser melting molding starts.

[0043] 3) The laser power used in selective laser melting and molding is 80W, the scanning speed is 500mm / s, the scanning spacing is 100μm, the spot diameter is ...

Example Embodiment

[0049] Example 2

[0050] This embodiment provides a method for preparing a high-strength and tough magnesium rare earth alloy by selective laser melting additive manufacturing technology, which specifically adopts the following steps:

[0051] 1) Mg-14.92Gd-0.30Zr (wt.%) alloy powder was prepared by gas atomization, and the alloy powder was sieved, and the powder of 300-500 mesh (average particle size was 42 μm) was selected for laser selection. Melt molding.

[0052] 2) Put the powder into the powder bed of the selective laser melting equipment after drying at 200°C / 5h in a vacuum drying box, preheat the substrate to 150°C, pass in the protective gas argon for gas circulation, and wait for the molding chamber When the oxygen and water vapor content in the room is lower than 100ppm, the selective laser melting molding starts.

[0053] 3) The laser power used in selective laser melting molding is 80W, the scanning speed is 100mm / s, the scanning spacing is 100μm, the spot d...

Example Embodiment

[0059] Example 3

[0060] This embodiment provides a method for preparing a high-strength and tough magnesium rare earth alloy by selective laser melting additive manufacturing technology, which specifically adopts the following steps:

[0061] 1) Prepare Mg-19.89Gd (wt. %) alloy powder by gas atomization, sieve the alloy powder, and select powder of 500 mesh or more (average particle size is 34 μm) for selective laser melting molding.

[0062] 2) Put the powder into the powder bed of the selective laser melting equipment after drying at 150°C / 4h in a vacuum drying box, preheat the substrate to 100°C, pass in the protective gas argon for gas circulation, and wait for the molding chamber When the oxygen and water vapor content in the room is lower than 100ppm, the selective laser melting molding starts.

[0063] 3) The laser power used in selective laser melting molding is 160W, the scanning speed is 1000mm / s, the scanning spacing is 50μm, the spot diameter is 65μm, the laye...

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Abstract

The invention provides a method for preparing high strength and ductility magnesium-rare earth alloy through a selective laser melting additive manufacturing technology. The method comprises the following steps that A, through a gas atomization method, Mg-RE-(Zn)-Zr alloy spherical powder is prepared; B, selective laser melting molding is carried out on the Mg-RE-(Zn)-Zr alloy spherical powder toobtain the high strength and ductility magnesium-rare earth alloy; and C, the magnesium-rare earth alloy made in the B is subjected to heat treatment: solid solution + aging treatment or aging treatment directly. Through regulating of selective laser melting process parameters (laser power, scanning speed, scanning interval, light spot diameter, layer thickness, interlayer corner, base plate preheating temperature, partition width and lap-joint area width and subsequent heat treatment process parameters (temperature and time), the microstructure and the mechanical property of the alloy are regulated. The selective laser melting technology is used firstly for preparing the high strength and ductility Mg-RE-(Zn)-Zr alloy.

Description

technical field [0001] The invention relates to the technical field of preparation of nonferrous metal alloys, in particular to a method for preparing high-strength and tough magnesium rare-earth alloys by a selective laser melting additive manufacturing technology. Background technique [0002] As the lightest metal structural material, magnesium alloy has the advantages of low density, high specific strength and specific stiffness, and has very broad application prospects in the fields of rail transit, aerospace and 3C products. The commercial magnesium alloys currently on the market mainly include Mg-Al series and Mg-Zn series. However, these magnesium alloys have low absolute strength and poor plasticity, which limits the further expansion of the application range of magnesium alloys. Mg-RE magnesium alloys have excellent solid solution strengthening and age hardening effects, which brings great possibilities for the development of high strength and toughness magnesium a...

Claims

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Application Information

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IPC IPC(8): B22F9/08B22F3/105B22F3/24C22C23/06C22C1/04C22F1/06B33Y10/00
CPCB22F9/082B22F3/24C22C23/06C22C1/0408C22F1/06B33Y10/00B22F2003/248B22F2998/10B22F10/00B22F10/34B22F10/36B22F10/28B22F10/64B22F10/366B22F10/32Y02P10/25B33Y70/00B33Y80/00B22F1/05B22F1/065B33Y40/10
Inventor 吴玉娟邓庆琛彭立明罗远航宿宁常治宇薛晓瑜
Owner SHANGHAI JIAO TONG UNIV
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