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Method for preparing high strength and toughness magnesium rare earth alloy by selective laser melting additive manufacturing technology

A selective laser melting, magnesium rare earth alloy technology, applied in the direction of additive manufacturing, additive processing, energy efficiency improvement, etc., can solve the problems of coarse grain and eutectic phase, mechanical properties of inclusions, composition segregation, etc., and achieve grain boundary β The effect of less phase content, good product stability and short molding cycle

Active Publication Date: 2021-08-03
SHANGHAI JIAOTONG 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

Method used

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  • Method for preparing high strength and toughness magnesium rare earth alloy by selective laser melting additive manufacturing technology
  • Method for preparing high strength and toughness magnesium rare earth alloy by selective laser melting additive manufacturing technology
  • Method for preparing high strength and toughness magnesium rare earth alloy by selective laser melting additive manufacturing technology

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Embodiment 1

[0040] This embodiment provides a method of selecting a high-strength tough magnesium rare earth alloy in a constituent laser melting add material manufacturing technique, and the following steps are used:

[0041] 1) The Mg-11.16 Gd-1.72Zn-0.44Zr (Wt.%) Alloy powder was prepared by aerosolization, and the alloy powder was sieved, and the powder was selected from 300 to 500 mesh (an average particle diameter of 42 μm). Signature laser melting formation.

[0042] 2) After the powder in a vacuum drying tank is 200 ° C / 5 h, it is loaded into the powder bed of the selection laser melting apparatus, and the preheating the substrate to 200 ° C, and the gas circulation is protected by gas argon to perform gas circulation. The indoor oxygen and water vapor content is less than 100 ppm to perform the constituent laser melt formation.

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

Embodiment 2

[0050] This embodiment provides a method of selecting a high-strength tough magnesium rare earth alloy in a constituent laser melting add material manufacturing technique, and the following steps are used:

[0051] 1) The Mg-14.92GD-0.30Zr (wt.%) Alloy powder was prepared by aerosolization, and the alloy powder was sieved, and the dispensing laser was selected using a powder of 300 to 500 mesh (an average particle diameter of 42 μm). Melting molding.

[0052] 2) After the powder in the vacuum drying tank is 200 ° C / 5 h, it is installed into the powder bed of the selection laser melting apparatus, and the preheating the substrate to 150 ° C, and the gas circulation is protected by gas argon to perform gas circulation, and is ready to be formed. The indoor oxygen and water vapor content is less than 100 ppm to perform the constituent laser melt formation.

[0053] 3) The laser power used in the selection laser melting formation is 80W, the scanning speed is 100 mm / s, the scannin...

Embodiment 3

[0060] This embodiment provides a method of selecting a high-strength tough magnesium rare earth alloy in a constituent laser melting add material manufacturing technique, and the following steps are used:

[0061] 1) The Mg-19.89 Gd (wt.%) Alloy powder was prepared by aerosolization, and the alloy powder was sieved, and the selected region of the powder was selected for the selection laser molten molding of the powder to select a 500 mesh (average particle diameter of 34 μm).

[0062] 2) Drying the powder after 150 ° C / 4H in a vacuum drying tank into the powder bed of the selection laser melting apparatus, and preheating the substrate to 100 ° C, gas circulation is protected by gas argon to perform gas circulation, and is ready to be formed The indoor oxygen and water vapor content is less than 100 ppm to perform the constituent laser melt formation.

[0063] 3) The laser power used in the selection laser melting formation is 160W, the scanning speed is 1000 mm / s, the scannin...

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Abstract

The invention provides a method for preparing a high-strength magnesium rare earth alloy by selective laser melting and additive manufacturing technology, comprising the following steps: A, preparing Mg-RE-(Zn)-Zr alloy spherical powder by gas atomization; B. 1. Carrying out Mg-RE-(Zn)-Zr alloy spherical powder for selective laser melting molding to obtain high-strength magnesium rare-earth alloy; C, carrying out heat treatment to the magnesium-rare-earth alloy prepared in step B: solid solution + aging treatment or directly aging treatment , you can. The present invention regulates the technological parameters (laser power, scanning speed, scanning distance, spot diameter, layer thickness, interlayer corner, substrate preheating temperature, partition width and overlapping region width) of selective laser melting and the technological parameters of subsequent heat treatment ( Temperature and time) to control the microstructure and mechanical properties of the alloy, and for the first time a high-strength and tough Mg‑RE‑(Zn)‑Zr alloy was prepared using a selective laser melting process.

Description

Technical field [0001] The present invention relates to the technical field of non-ferrous metal alloys, and is specifically a method of preparing high-strength tornesium rare earth alloys in a selection laser melting additive manufacturing technique. Background technique [0002] As the lightest metal structural material, the magnesium alloy has the advantages of low density, specific intensity and high ratio, and has a very broad application prospect in rail transit, aerospace and 3C products. At present, commercialized magnesium alloys in the market mainly include two categories: Mg-Al system and Mg-Zn systems, but the absolute strength of these magnesium alloys is low and the plasticity is poor, so that the application ranges to further expand the magnesium alloy. Mg-Re-riomarnesium alloys have excellent solid solution reinforcing and aging hardening effects, which brings great possibilities for the development of high-strength ligamental alloy. Further, the Zn element is add...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/08B22F3/105B22F3/24C22C23/06C22C1/04C22F1/06B33Y10/00
CPCB22F9/082B22F3/24C22C23/06C22C1/0408C22F1/06B33Y10/00B22F2003/248B22F2998/10B22F10/00B22F10/34B22F10/36B22F10/28B22F10/64B22F10/366B22F10/32Y02P10/25B33Y70/00B33Y80/00B22F1/05B22F1/065B33Y40/10B22F2999/00B22F2201/11
Inventor 吴玉娟邓庆琛彭立明罗远航宿宁常治宇薛晓瑜
Owner SHANGHAI JIAOTONG UNIV
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