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High-strength Al-Cr-SC alloy through 3D printing

An al-cr-sc, 3D printing technology, applied in the direction of improving energy efficiency, process efficiency, additive manufacturing, etc., can solve the problems of low mechanical properties, thermal cracks, poor mechanical properties, etc., and achieve the increase of precipitated phases, The effect of fine and uniform tissue and high density

Active Publication Date: 2020-04-14
CENT SOUTH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, 3D printing of traditional grades of aluminum alloys faces the following problems: (1) At present, only 4 series of cast AlSi alloys of traditional grades of aluminum alloys are suitable for 3D printing, and the formability is also good. Most of the 3D printing aluminum alloys are aluminum-silicon A series of alloys, but its mechanical properties are not high (tensile <400MPa, elongation <6.5%)
(2) 3D printing of traditional grades of aluminum alloys such as 2-7 series aluminum alloy gas atomized powder is prone to thermal cracks and poor mechanical properties

Method used

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  • High-strength Al-Cr-SC alloy through 3D printing
  • High-strength Al-Cr-SC alloy through 3D printing
  • High-strength Al-Cr-SC alloy through 3D printing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The composition of the high-strength aluminum-chromium alloy specially used for 3D printing according to the present invention is prepared, and the composition includes the following components in terms of mass percentage: Cr: 4.5%, Mg: 1.5%, Sc: 0.65%, Zr: 0.2%, Si: 0.2% %, Mn: 0.25%, Fe: 0.2%, Ti: 0.15%, AlCl 3 Powder: 0.14%; CaCl 2 +NaCl: 0.16%, the balance is Al.

[0036] The above-mentioned aluminum alloy powder preparation method:

[0037] (1) Raw material smelting: except AlCl 3 , CaCl 2 And except for NaCl powder, other elements are weighed in proportion to the raw material of the intermediate compound metal block and placed in a vacuum induction furnace for heating and melting. The pressure in the vacuum induction furnace is 0.8MPa, and the melting temperature is 850°C.

[0038] (2) Atomized powder production: transfer the above-mentioned smelted pre-alloyed metal into an atomization tank, and use helium gas to conduct atomization powder production, and the...

Embodiment 2

[0045] The composition of the high-strength aluminum-chromium alloy specially used for 3D printing in the present invention is prepared, and the composition includes the following components in terms of mass percentage: Cr: 5%, Mg: 1.7%, Sc: 0.75%, Zr: 0.25%, Si: 0.24 %, Mn: 0.28%, Fe: 0.24%, Ti: 0.17%, AlCl 3 Powder: 0.18%, CaCl 2 +NaCl: 0.17% and the balance is Al.

[0046] The above-mentioned aluminum alloy powder preparation method:

[0047] (1) Raw material smelting: except AlCl 3 , CaCl 2 In addition to NaCl powder, other elements are weighed in proportion to the raw material of the intermediate compound metal block and placed in a vacuum induction furnace for heating and melting.

[0048] (2) Atomized powder making: transfer the above-mentioned smelted pre-alloyed metal into an atomizing tank, and use helium gas to carry out atomized powder making.

[0049] (3) Powder sieving: the above-mentioned pre-alloyed metal powder was sieved through a mesh to obtain a metal ...

Embodiment 3

[0055] The composition of the high-strength aluminum-chromium alloy specially used for 3D printing in the present invention is prepared, and the composition includes the following components in terms of mass percentage: Cr: 6%, Mg: 1.9%, Sc: 0.80%, Zr: 0.28%, Si: 0.27 %, Mn: 0.3%, Fe: 0.27%, Ti: 0.19%, AlCl3 powder: 0.22%, CaCl2+NaCl: 0.18%, and the balance is Al.

[0056] The above-mentioned aluminum alloy powder preparation method:

[0057] (1) Raw material smelting: except AlCl 3 , CaCl 2 In addition to NaCl powder, other elements are weighed in proportion to the raw material of the intermediate compound metal block and placed in a vacuum induction furnace for heating and melting.

[0058] (2) Atomized powder making: transfer the above-mentioned smelted pre-alloyed metal into an atomizing tank, and use helium gas to carry out atomized powder making.

[0059] (3) Powder sieving: the above-mentioned pre-alloyed metal powder is screened through a mesh to obtain a metal powd...

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Abstract

The invention discloses a high-strength Al-Cr-SC alloy through 3D printing. The metal powder for a high-strength aluminum-chromium alloy through 3D printing comprises the following components, by masspercentage, 2.5-10% of Cr, 0.5-2.5% of Mg, 0.1-0.9% of Sc, 0.2-0.7% of Zr, 0.1-0.3% of Si, 0.2-0.45% of Mn, 0.1-0.35% of Fe, 0.1-0.25% of Ti, 0.05-0.5% of AlCl3 powder, 0.05-0.3% of CaCl2 + NaCl andthe balance Al. The preparation method of the metal powder comprises the following steps that Al, Cr, Mg, Sc, Zr, Si, Mn, Fe, Ti pure metal block raw materials are weighed to be heated and melted, atomized for powder making, sieving and heat preservation for drying are conducted, AlCl3, CaCl2 and NaCl powder are added, and milling and mixing are conducted. According to the high-strength Al-Cr-SC alloy through 3D printing, the printed aluminum alloy part has no cracks and has high density, and the mechanical properties, wear resistance, corrosion resistance and high temperature and oxidation resistance are high.

Description

technical field [0001] The invention belongs to the technical field of additive manufacturing 3D printing material design, and in particular relates to a 3D printing high-strength Al-Cr-Sc alloy. Background technique [0002] In recent years, additive manufacturing (commonly known as 3D printing, two processes of special laser selective melting and laser melting deposition in this patent) aluminum alloy has been widely valued in aerospace, rail transit and other fields. This is because: First, the traditional processing methods of aluminum alloys are mainly casting, plastic processing and welding, and it is difficult to form components with high complex shapes. With the lightweight development of aerospace and rail transit, aluminum alloy parts with complex topological structures are difficult to process by traditional methods, and need to be processed by 3D printing technology; secondly, it is difficult to prepare ultra-fine Aluminum alloy with crystal structure, and 3D pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00B22F3/105B22F3/24B22F9/08B33Y10/00B33Y70/00C22C1/03C22C21/00
CPCC22C21/00C22C1/03C22C1/026B22F9/082B22F3/24B33Y70/00B33Y10/00B22F2009/0848B22F2003/248B22F2998/10B22F10/00B22F12/43B22F10/34B22F10/64B22F10/36B22F10/366B22F10/362B22F10/28B22F1/00B22F1/0003B22F10/20Y02P10/25
Inventor 李瑞迪王银袁铁锤李平牛朋达王敏卜张志坚
Owner CENT SOUTH UNIV
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