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Metal powder for 3D printing with ultrasonically refined grains and preparation method thereof

A technology of 3D printing and grain refinement, which is applied in the field of 3D printing, can solve the problems of high-purity aluminum grain refinement, inability to effectively inhibit alloy solidification segregation, limited types, etc., and achieve great application value, grain The effect of refinement is remarkable and the effect of grain refinement

Active Publication Date: 2022-02-01
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the types of grain refiners are limited, such as commercial Al-Ti-B master alloys commonly used in aluminum and aluminum alloys, which cannot be used for grain refinement of high-purity aluminum, nor can they effectively inhibit the solidification of some alloys Segregation

Method used

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  • Metal powder for 3D printing with ultrasonically refined grains and preparation method thereof
  • Metal powder for 3D printing with ultrasonically refined grains and preparation method thereof

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preparation example Construction

[0027] The present invention will be further described in detail below in conjunction with specific steps. The present invention discloses a metal powder for 3D printing of ultrasonically refined grains and a preparation method thereof. The preparation method specifically includes the following processes:

[0028] (1) Melting the base metal: put aluminum or aluminum alloy materials into the crucible, and the aluminum alloy can be any grade of aluminum alloy, such as 7050 and 7075; put the crucible into a crucible-type resistance melting furnace and heat it up to 750°C, After the aluminum material is completely melted, keep it warm for 30 minutes to obtain molten aluminum or aluminum alloy liquid, that is, matrix metal liquid A in molten state.

[0029] (2) Add master alloy: Add any one of the grain refiner Al-Ti-C master alloys to the molten matrix metal liquid according to the amount, Al-Ti-C master alloys such as Al-5Ti -1C, Al-3Ti-1C and Al-3Ti-0.15C, etc.; the amount of re...

Embodiment 1

[0043] (1) Melting the base metal: Put the aluminum into the crucible, put the crucible into a crucible-type resistance melting furnace and heat up to 750°C. After all the aluminum is melted, keep it warm for 30 minutes to obtain molten aluminum.

[0044] (2) Adding an intermediate alloy: adding Al-5Ti-1C to the aluminum liquid, the Ti equivalent in Al-5Ti-1C accounts for 25ppm of the aluminum mass in step (1); after adding, mechanically stir with a stirring bar for 8min.

[0045] (3) Ultrasonic treatment: Lower the ultrasonic probe of the ultrasonic device to contact with the liquid surface of the above melt, preheat the probe until the temperature of the probe is 750°C, continue to lower the probe to 10mm below the melt surface, and keep it warm for 5 minutes again , ultrasonic treatment, the treatment time is 10min.

[0046] (4) Refining and slag removal: Add slag remover to the above melt, add 1g of slag remover per 500g of molten metal C, and remove scum on the surface of...

Embodiment 2

[0050] (1) Melting the base metal: Put the aluminum alloy 7075 into the crucible, and put the crucible into the crucible resistance melting furnace to heat up to 750°C. After the aluminum alloy 7075 is completely melted, keep it warm for 30 minutes to obtain molten aluminum alloy. liquid.

[0051] (2) Adding an intermediate alloy: adding Al-5Ti-1C to the aluminum alloy melt, the Ti equivalent in Al-5Ti-1C accounts for 50ppm of the aluminum alloy quality in step (1); after adding, carry out mechanical Stir for 10 min.

[0052] (3) Ultrasonic treatment: Lower the ultrasonic probe of the ultrasonic device to contact with the liquid surface of the above melt, preheat the probe until the temperature is 750°C, continue to lower the probe to 15mm below the melt surface, and keep it warm for 5 minutes again , ultrasonic treatment, the treatment time is 5min.

[0053] (4) Refining and slag removal: Add slag remover to the above melt, add 1g of slag remover per 500g of molten metal, a...

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Abstract

The invention discloses a metal powder for 3D printing with ultrasonically refined grains and a preparation method thereof; the preparation method uses an ultrasonic treatment in the metal smelting process to promote a more uniform melting of the grain refiner in the liquid of the base metal During the solidification process, ultrasonic treatment is performed again to refine the grains during the solidification process of the ingot; through two ultrasonic treatments, the solidification structure of the ingot is changed from thick columnar crystals to uniform and fine equiaxed crystals, and ultrasonic waves generate The cavitation effect will promote the formation of nuclei in the liquid metal, and the macro-segregation and micro-segregation of the ingot will be improved; the prepared metal powder has small microscopic grains, and the prepared metal castings have high mechanical properties, which fundamentally improves the Mechanical properties of the prepared metal castings.

Description

【Technical field】 [0001] The invention belongs to the field of 3D printing, and relates to a metal powder for 3D printing with ultrasonically refined crystal grains and a preparation method thereof. 【Background technique】 [0002] The mechanical properties of metal materials mainly depend on their internal organization and structure, and an important characteristic parameter in the organization is the grain size, so it is particularly important to refine the grain size and control the grain size. At present, there are mainly two methods for grain refinement, one is to add a grain refiner to the metal melt, and the other is to use physical vibration. Among them, the types of grain refiners are limited, such as commercial Al-Ti-B master alloys commonly used in aluminum and aluminum alloys, which cannot be used for grain refinement of high-purity aluminum, nor can they effectively inhibit the solidification of some alloys Segregation. For magnesium and magnesium alloys, the g...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/04C22C1/03C22C1/06C22C21/00B22F1/05B33Y70/00
CPCB22F1/0003C22C1/026C22C1/03C22C1/06C22C21/003B22F9/04B33Y70/00
Inventor 王强张康牛文娟
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY