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Laser additive and heat treatment composite process for high-strength and high-toughness aluminum-silicon alloy or composite material thereof

A composite material and laser additive technology, applied in the field of metal materials, can solve problems such as high aging temperature and unfavorable fine-grained structure, and achieve the effects of increased strength and hardness, good comprehensive mechanical properties, and simple preparation process

Active Publication Date: 2021-03-23
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are few relevant aging studies, and the aging temperature used is still high, which is not conducive to retaining the fine-grained structure of AlSi10Mg prepared by SLM. Therefore, the most suitable heat treatment process for the preparation of AlSi10Mg by SLM remains to be studied.

Method used

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  • Laser additive and heat treatment composite process for high-strength and high-toughness aluminum-silicon alloy or composite material thereof
  • Laser additive and heat treatment composite process for high-strength and high-toughness aluminum-silicon alloy or composite material thereof
  • Laser additive and heat treatment composite process for high-strength and high-toughness aluminum-silicon alloy or composite material thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] This embodiment is a composite process of laser material addition and heat treatment for preparing high-strength and tough aluminum-silicon alloys or their composite materials, and the device used in this process includes a laser selective melting printer. where the printer structure is as figure 1As shown, the laser printer is provided with a cooling system, a vacuum system and an inert gas protection device. The laser printer is provided with a powder spreading bed 6 and a recovery box 7. Before printing, the scraper 12 needs to be moved to the middle of the powder spreading bed 6. By adjusting Nuts at both ends of the scraper are used to adjust the distance between the scraper and the powder spreading bed 6, and then the AlSi10Mg powder is paved on the upper surface of the powder cylinder, and the powder of the powder bed is scraped out from the powder cylinder 11 by the scraper 12. The first layer of printing starts when the metal powder is laid flat on the powder b...

Embodiment 2

[0036] The structure of the preparation process device for synchronously improving the strength and plasticity of the AlSi10Mg material in this embodiment is the same as that in Embodiment 1.

[0037] The printing process of the metal block is the same as that in Embodiment 1, the difference is that the laser power is reduced to 245W to carry out the printing experiment of the metal block. The specific method is as follows:

[0038] The experimental environment is the same as in Example 1. Before printing, the scraper must be moved to the middle of the powder bed, and the distance between the scraper and the powder bed can be adjusted by adjusting the nuts at both ends of the scraper. After returning the metal powder in the powder cylinder, start the first layer of printing. The printing parameters are: laser power 245W, scanning speed 1.6m / s, layer thickness 30μm scanning distance 0.124mm, scanning method is strip strategy, layer to layer Rotate 67 degrees between them. Afte...

Embodiment 3

[0043] The structure of the preparation process device for synchronously improving the strength and plasticity of the AlSi10Mg material in this embodiment is the same as that in Embodiment 1.

[0044] The printing process of the metal block is the same as that in Embodiment 1, the difference is that the laser power is increased to 300W to carry out the printing experiment of the metal block. The specific method is as follows:

[0045] The experimental environment is the same as in Example 1. Before printing, the scraper must be moved to the middle of the powder bed, and the distance between the scraper and the powder bed can be adjusted by adjusting the nuts at both ends of the scraper. After returning the metal powder in the powder cylinder, start the first layer of printing. The printing parameters are: laser power 300W, scanning speed 1.6m / s, layer thickness 30μm scanning distance 0.124mm, scanning method is strip strategy, layer to layer Rotate 67 degrees between them. Af...

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Abstract

The invention discloses a laser additive and heat treatment composite process for a high-strength and high-toughness aluminum-silicon alloy or a composite material thereof, and belongs to the technical field of metal materials. The process comprises the following steps of: firstly, carrying out selective laser melting printing on an aluminum-silicon alloy and a composite material thereof under thematching of parameters of thin powder laying, low power, high speed and air cooling to obtain a supersaturated solid solution structure; and then carrying out low-temperature aging heat treatment onthe supersaturated solid solution to finally obtain a high-performance sample which retains a printing-state fine structure and contains a fine reinforced phase. The strength and plasticity of the aluminum-silicon alloy and the composite material thereof can be remarkably improved, AlSi10Mg is taken as an example, and the strength and plasticity after treatment by the preparation process are superior to those of a same-system printed piece which is industrially applied at present. The process has the advantages of capability of preparing complex porous structural parts, high material utilization rate, high production efficiency, short production process, simplicity, safety, no pollution and economy.

Description

technical field [0001] The invention relates to the technical field of metal materials, in particular to a laser additive and heat treatment composite process for preparing high-strength and tough aluminum-silicon alloys or composite materials thereof. Background technique [0002] With the development of modern industry, there is an urgent demand for high-strength, high-plasticity, high-precision, and lightweight complex parts, and additive manufacturing technology has emerged, among which laser selective melting (SLM) is a high-precision rapid additive Manufacturing technology has broad application prospects. The direct forming of complex structural parts can not only reduce the time and cost required for manufacturing and assembly, but also reduce the disadvantages of weight increase and stress concentration caused by welding and other connection methods. A lot of research went into it. [0003] At present, the aluminum alloys used for SLM preparation mainly include 606...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F10/28B22F10/64B22F3/105B33Y10/00B33Y70/00B33Y40/20C22F1/043C22C21/02
CPCB33Y10/00B33Y70/00B33Y40/20C22F1/043C22C21/02Y02P10/25
Inventor 张昊倪丁瑞马宗义赵泓博肖伯律王东王全兆薛鹏
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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