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Method for preparing high-strength aluminum alloy through selective laser melting

A selective laser melting and aluminum alloy technology, applied in the direction of additive manufacturing, energy efficiency improvement, metal processing equipment, etc., can solve the problems affecting the formability and mechanical properties of alloys, so as to avoid thermal cracks and hole defects, improve mechanical properties, The effect of fine and uniform grain

Pending Publication Date: 2019-07-26
SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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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 provide a method for preparing high-strength aluminum alloys by selective laser melting, which aims to solve the problem of forming holes and thermal crack defects throughout the entire grain and extending along the grain boundaries in the prior art method for forming high-strength aluminum alloys by selective laser melting , a problem that seriously affects the formability and mechanical properties of the alloy

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  • Method for preparing high-strength aluminum alloy through selective laser melting
  • Method for preparing high-strength aluminum alloy through selective laser melting

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Embodiment 1

[0045] The method for the selective laser melting forming of Al-Zn-Mg-Cu high-strength aluminum alloy comprises the following steps:

[0046] The material provided is Al-Zn-Mg-Cu high-strength aluminum alloy spherical powder (grain size 200 mesh, D90 is 40μm), and composite particles (40nm hard phase titanium carbide and 40μm alloy element titanium, volume ratio 1:1) Mix according to the weight ratio of 100:2 and put it into the powder cartridge.

[0047] Vacuumize the chamber of selective laser melting equipment to 10 -3 Pa, filled with high-purity argon, repeated 3 times. Spread powder on the powder bed, and preheat the powder-coated substrate to 150°C.

[0048] Selective laser melting process parameters: laser power 210w, laser diameter 80μm, scanning speed 135mm / s, scanning distance 50μm, layer thickness 70μm. After the part is formed, it is cooled slowly in the forming cavity to prevent cracks caused by chilling.

[0049] An Al-Zn-Mg-Cu high-strength aluminum alloy fo...

Embodiment 2

[0053] The method for the selective laser melting forming of Al-Si-Mg-Cu high-strength aluminum alloy comprises the following steps:

[0054] The material provided is Al-Si-Mg-Cu high-strength aluminum alloy spherical powder (grain size 200 mesh, D90 is 40μm), and composite particles (40nm hard phase titanium carbide and 40μm alloy element strontium, volume ratio 1:1) Mix according to the weight ratio of 100:1 and put it into the powder cartridge.

[0055] Vacuumize the chamber of selective laser melting equipment to 10 -3 Pa, filled with high-purity argon, repeated 3 times. Spread powder on the powder bed, and preheat the powder-coated substrate to 150°C.

[0056] Selective laser melting process parameters: laser power 210w, laser diameter 80μm, scanning speed 135mm / s, scanning distance 50μm, layer thickness 70μm. After the part is formed, it is cooled slowly in the forming cavity to prevent cracks caused by chilling.

[0057] An Al-Si-Mg-Cu high-strength aluminum alloy f...

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Abstract

The invention provides a method for preparing a high-strength aluminum alloy through selective laser melting. The method for preparing the high-strength aluminum alloy through selective laser meltingcomprises the following steps: a high-strength spherical aluminum alloy powder and functional composite particles are provided, the functional composite particles are the mixture of a hard phase and alloy elements, and mixing treatment is carried out on the high-strength spherical aluminum alloy powder and the functional composite particles to obtain a mixed powder body; and under the condition ofinert atmosphere, selective laser melting equipment is adopted for carrying out selective laser melting forming under the conditions that the laser power is 190-220W, the laser beam diameter is 70[mu]m, the scanning speed is 115-155mm / s, the scanning distance is 40-80[mu]m, the powder layer thickness is 70[mu]m, and the powder preheating temperature is 150-250 DEG C, natural cooling is carried out, and then a high-strength aluminum alloy workpiece is prepared.

Description

technical field [0001] The invention belongs to the field of 3D printing of metal materials, and in particular relates to a method for preparing high-strength aluminum alloy by selective laser melting. Background technique [0002] Selective laser melting technology is an important branch of the metal 3D printing family. It can directly melt metal powder locally by laser to realize rapid and precise forming of complex parts. It has realized stainless steel, high-strength steel, titanium alloy, superalloy, cast aluminum alloy, Forming of cobalt chromium alloy and other materials. However, it cannot play a good role in the manufacture of complex precision components of high-strength aluminum alloys that are widely used in high-end fields such as aerospace, weaponry, automotive industry, and electronics. Because of the high degree of alloying of high-strength aluminum alloys, large solidification range, and high thermal cracking sensitivity, the high temperature (above 3000°C)...

Claims

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Application Information

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IPC IPC(8): B22F9/04B22F1/00B22F3/105C22C21/00C22C1/05B33Y50/02
CPCB22F9/04C22C21/00C22C1/0416C22C1/05B33Y50/02B22F2009/043B22F10/00B22F1/05B22F10/34B22F10/28B22F10/36B22F10/32Y02P10/25
Inventor 李欣蔚朱强胡小刚卢宏兴
Owner SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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