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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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  • Summary
  • 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 additive manufacturing technology, and to overcome traditional casting Magnesium alloy grains and eutectic phase are coarse, composition segregation, easy to produce porosity, shrinkage cavity, inclusion and other defects and the key problems of poor mechanical properties

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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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Embodiment 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, and specifically adopts the following steps:

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

[0042] 2) Dry the powder in a vacuum drying oven at 200°C / 5h, then put it into the powder bed of the selective laser melting equipment, and preheat the substrate to 200°C, pass in the protective gas argon for gas circulation, and wait for the molding chamber Indoor oxygen and water vapor content is lower than 100ppm to start selective laser melting molding.

[0043] 3) The laser power used in the selective laser melting molding is 80W, the scanning speed is 500mm / s, the scanning distance is 100μm, the spot diameter is 100μm, the layer thickness is 30μm, the...

Embodiment 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, and specifically adopts the following steps:

[0051] 1) Prepare Mg-14.92Gd-0.30Zr (wt.%) alloy powder by gas atomization method, and sieve the alloy powder, select 300-500 mesh (average particle size: 42μm) powder for selective laser Melt molding.

[0052] 2) Dry the powder in a vacuum drying oven at 200°C / 5h, then put it into the powder bed of the selective laser melting equipment, and preheat the substrate to 150°C, pass in the protective gas argon for gas circulation, and wait for the molding chamber Indoor oxygen and water vapor content is lower than 100ppm to start selective laser melting molding.

[0053] 3) The laser power used in the selective laser melting molding is 80W, the scanning speed is 100mm / s, the scanning distance is 100μm, the spot diameter is 100μm, the layer thickness is 2μm, the interl...

Embodiment 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, and specifically adopts the following steps:

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

[0062] 2) Dry the powder in a vacuum drying oven at 150°C / 4h, then put it into the powder bed of the selective laser melting equipment, and preheat the substrate to 100°C, pass in the protective gas argon for gas circulation, and wait for the molding chamber Indoor oxygen and water vapor content is lower than 100ppm to start selective laser melting molding.

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

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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
CPCB22F9/082B22F3/24C22C23/06C22C1/0408C22F1/06B33Y10/00B22F2003/248B22F2998/10B22F10/00B22F10/34B22F10/36B22F10/28B22F10/64B22F10/366B22F10/32Y02P10/25B33Y70/00B33Y80/00B22F1/05B22F1/065B33Y40/10B22F2999/00B22F2201/11B22F2301/058
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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