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A laser additive and heat treatment composite process for preparing high-strength and tough aluminum-silicon alloys or their composite materials

A composite material and laser additive technology, which is applied in the field of metal materials, can solve the problems of unfavorable fine-grained structure and high aging temperature, and achieve good comprehensive mechanical properties, increased strength and hardness, and increased production efficiency.

Active Publication Date: 2022-03-08
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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  • A laser additive and heat treatment composite process for preparing high-strength and tough aluminum-silicon alloys or their composite materials
  • A laser additive and heat treatment composite process for preparing high-strength and tough aluminum-silicon alloys or their composite materials
  • A laser additive and heat treatment composite process for preparing high-strength and tough aluminum-silicon alloys or their composite materials

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 high-strength and tough aluminum-silicon alloy or its composite material laser additive and heat treatment composite process, which belongs to the technical field of metal materials. In this process, the aluminum-silicon alloy and its composite materials are selected by laser melting and printing under the parameters of thin powder spreading, low power, high speed, and external air cooling to obtain the supersaturated solid solution structure; then the supersaturated solid solution is processed. The low-temperature aging heat treatment finally obtains a high-performance sample that retains the fine structure of the printed state and contains a fine reinforcing phase. The present invention can significantly improve the strength and plasticity of aluminum-silicon alloys and their composite materials. Taking AlSi10Mg as an example, the strength and plasticity of this preparation process are better than those of the same system printing parts currently used in industry. The methods involved The invention has the advantages of being able to prepare structural parts with complex porous shapes, high material utilization rate, high production efficiency, short production process, simple, safe, pollution-free and economical.

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] The aluminum alloys currently used for SLM preparation mainly include 6061,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F10/28B22F10/64B33Y10/00B33Y70/00B33Y40/20C22F1/043C22C21/02
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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