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Method for preparing heat-resisting aluminum alloy

An aluminum alloy, heat-resistant technology, applied in the field of metal manufacturing, can solve the problems of limiting the wide application of Al-Fe-V-Si alloy components, growing the grains of the alloy matrix, reducing the mechanical properties of the alloy, etc. Processing and post-processing links, high surface forming accuracy, and the effect of improving production efficiency

Inactive Publication Date: 2018-02-02
BEIJING HANGXING MACHINERY MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is difficult to directly prepare structural parts with complex shapes (complex curved surfaces, cooling channels or inner hole structures) by using the above-mentioned processes. Generally, subsequent hot pressing, hot extrusion, hot isostatic pressing or forging are required, and the cycle of parts preparation is relatively long. Long, high production cost, low production efficiency
Not only that, the subsequent high-temperature thermal processing (hot extrusion, forging, etc.) is likely to cause the grain growth of the alloy matrix and the coarsening behavior of the dispersion strengthening phase, thereby reducing the mechanical properties of the alloy.
The above shortcomings limit the further wide application of Al-Fe-V-Si alloy components

Method used

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  • Method for preparing heat-resisting aluminum alloy
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  • Method for preparing heat-resisting aluminum alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] 1. Select Al-11.5Fe-1.4V-2.3Si pre-alloyed powder prepared by argon atomization method, the powder is spherical or nearly spherical, and the diameter is between 20-55 μm, and it is loaded into the powder coating of the laser selective melting system in the institution.

[0057] 2. According to the shape of the alloy parts to be processed, use the computer to establish a three-dimensional CAD model, and use the slicing software to perform layered slice discretization in the height direction of the model. The thickness of the slices is uniform (thickness is 0.06mm), and includes Cross-sectional profile information and scanning processing path, save multi-layer slice information as STL file, and transfer to SLM computer numerical control device, preset forming parameters.

[0058] 3. Grind the surface of the pure Al forming substrate with a size of 200mm×200mm×10mm with #800 sandpaper and clean it with acetone, and then fix it on a liftable workbench. You can choose pure A...

Embodiment 2

[0065] The slice thickness was set at 0.03 mm.

[0066] The forming parameters are set as follows: the power is 350W, the scanning speed is 800mm / s, the scanning distance is 0.08mm, and the times of melting are 2-4 times.

[0067] Other steps in this embodiment are the same as in Embodiment 1.

[0068] The prepared Al-11.5Fe-1.4V-2.3Si alloy has a high density of 99.2%, no pores and microcracks. Mainly composed of Al solid solution and Al 12 (Fe,V) 3 Si strengthening phase composition. Al 12 (Fe,V) 3 Si is uniformly dispersed and distributed, and the phase size is extremely small, and the phase size is 20-80nm. The alloy has excellent mechanical properties, and its ultimate tensile strength, yield strength and elongation are 552MPa, 529MPa and 7%, respectively.

Embodiment 3

[0070] The slice thickness was set at 0.15 mm.

[0071] The forming parameters are set as follows: the power is 400W, the scanning speed is 1200mm / s, the scanning distance is 0.15mm, and the number of melting times is 4 times.

[0072] Other steps in this embodiment are the same as in Embodiment 1.

[0073] The prepared Al-11.5Fe-1.4V-2.3Si alloy has a high density of 99.2%, no pores and microcracks. Mainly composed of Al solid solution and Al 12 (Fe,V) 3 Si strengthening phase composition. Al 12 (Fe,V) 3 Si is uniformly dispersed and distributed, and the phase size is extremely small, and the phase size is 20-80nm. The alloy has excellent mechanical properties, and its ultimate tensile strength, yield strength and elongation are 554MPa, 527MPa and 7%, respectively.

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Abstract

The invention discloses a method for preparing a heat-resisting aluminum alloy, and belongs to the field of metal manufacturing. The method comprises the steps that according to the shape of an Al-Fe-V-Si alloy part to be processed, a three-dimensional model is established; layered slice cutting processing is conducted on the three-dimensional model, so that the preset slice thickness in the height direction is formed; a scanning path of each slice is determined according to the cross section profile information of each slice of the three-dimensional model; a layer of pre-alloy powder is laidin accordance with the slice thickness to form a powder layer; the current powder layer is scanned by using a laser beam according to the scanning path, thus a deposition layer corresponding to a slice of the three-dimensional model is made; a control table is controlled to be dropped to the distance of the thickness of a slice, and a layer of pre-alloy powder is laid on the deposition layer againof a formed substrate plate through a powder paving mechanism according to the slice thickness to form a powder layer; and repeating is conducted until processing is finished. The alloy part preparedby the method is high in surface forming precision and good in quality, the research and manufacture cycle can be effectively shortened, the production efficiency is improved, and the production costis reduced.

Description

technical field [0001] The invention belongs to the field of metal manufacturing, in particular to a method for preparing a heat-resistant aluminum alloy. Background technique [0002] Structural materials with light weight and high strength are the goals that the aerospace industry has been pursuing. Advanced space vehicles need to be matched with lightweight structural materials with low density, high specific strength, and high specific rigidity to further increase flight speed and carrying capacity. [0003] Al-Fe-V-Si heat-resistant aluminum alloy has low density, high specific strength and specific stiffness, good room temperature and high temperature strength, and is a potential substitute for titanium alloys and heat-resistant alloys currently used in the range of 150°C-400°C The new heat-resistant structural material of steel has broad application prospects in the aerospace industry. The excellent comprehensive performance of the Al-Fe-V-Si alloy is due to the nan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/105C22C21/00B33Y10/00
CPCC22C21/00B33Y10/00B22F10/00B22F10/364B22F10/28B22F10/36B22F10/366B22F10/32Y02P10/25
Inventor 孙少波任金鑫张鑫陈久友李宏伟王志敏
Owner BEIJING HANGXING MACHINERY MFG CO LTD
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