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A Metal Microstructure Refinement Method Based on Metal Fluid Impact

A metal structure and metal liquid technology, applied in the field of metal preparation, can solve the problems of high cost, long process and low efficiency, and achieve the effect of low cost, short process and high efficiency

Active Publication Date: 2021-10-22
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In view of the problems of high cost, long process, low efficiency, additional stirring / vibration device or element addition existing in the traditional metal structure refinement method, the present invention proposes to directly prepare uniform and fine structure by using the moving metal liquid flow to impact the low-temperature substrate. metal parts

Method used

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  • A Metal Microstructure Refinement Method Based on Metal Fluid Impact
  • A Metal Microstructure Refinement Method Based on Metal Fluid Impact
  • A Metal Microstructure Refinement Method Based on Metal Fluid Impact

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Step 1: Fill the nozzle with 7075 aluminum alloy melt, and use induction heating to maintain the temperature of the 7075 aluminum alloy melt at 100°C above the liquidus temperature of the 7075 aluminum alloy to ensure that the composition of the 7075 aluminum alloy melt is uniform , It has better fluidity and required superheat, and at the same time meets the needs of subsequent stable accumulation and high-speed circular flow.

[0027] The second step: Under the action of gas pressure, the 7075 aluminum alloy melt is ejected from the nozzle at a speed of 3000mm / s in the form of a continuous 7075 aluminum alloy liquid flow and impacts on the low-temperature pure copper substrate to ensure that the 7075 aluminum alloy After the liquid flow impacts the low-temperature pure copper substrate, it has the required initial flow velocity and can form a high-speed annular flow field; the diameter of the 7075 aluminum alloy liquid flow is 0.5mm, so that the 7075 aluminum alloy liq...

Embodiment 2

[0030] Step 1: Fill the nozzle with 7075 aluminum alloy melt, and use resistance heating to keep the temperature of the 7075 aluminum alloy melt at 20°C below the liquidus temperature of the 7075 aluminum alloy to ensure that the composition of the 7075 aluminum alloy melt is uniform , It has better fluidity and required superheat, and at the same time meets the needs of subsequent stable accumulation and high-speed circular flow.

[0031] The second step: Under the action of gas pressure, the 7075 aluminum alloy melt is ejected from the nozzle at a speed of 2000mm / s in the form of a continuous 7075 aluminum alloy liquid flow and impacts on the low-temperature pure copper substrate to ensure that the 7075 aluminum alloy After the liquid flow impacts the low-temperature pure copper substrate, it has the required initial flow velocity and can form a high-speed annular flow field; the diameter of the 7075 aluminum alloy liquid flow is 1mm, so that the 7075 aluminum alloy liquid fl...

Embodiment 3

[0034] Step 1: Fill the nozzle with 2A70 aluminum alloy melt, and use induction heating to maintain the temperature of the 2A70 aluminum alloy melt at 200°C above the liquidus temperature of the 2A70 aluminum alloy to ensure that the composition of the 2A70 aluminum alloy melt is uniform , It has better fluidity and required superheat, and at the same time meets the needs of subsequent stable accumulation and high-speed circular flow.

[0035]The second step: Under the action of its own gravity, the 2A70 aluminum alloy melt is ejected from the nozzle at a speed of 1000mm / s in the form of a continuous 2A70 aluminum alloy liquid flow and impacts on the low-temperature aluminum nitride substrate to ensure that the 2A70 aluminum alloy The alloy liquid flow has the required initial flow velocity after impacting the low-temperature aluminum nitride substrate, and can form a high-speed annular flow field; the diameter of the 2A70 aluminum alloy liquid flow is 5mm, so that the 2A70 alu...

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Abstract

The invention discloses a metal structure refinement method based on metal liquid flow impact, and belongs to the technical field of metal preparation. The method comprises the steps of: filling a nozzle with molten metal, and maintaining the temperature of the molten metal at 1-300° C. above the liquidus temperature of the metal; The speed of ‑5000mm / s is sprayed in the form of continuous metal liquid flow and impacts on the low-temperature substrate; the nozzle is driven by a horizontal motion mechanism to move in the horizontal direction at a speed of 1‑1000mm / s, so that the metal liquid flow impacts After reaching the surface of the low-temperature substrate, it accumulates stably behind the metal liquid flow, and the distance between the solid-liquid interface of the deposited metal and the metal liquid flow is always kept constant, and finally a metal piece with a uniform and fine structure is prepared. . The invention adopts the method of impacting the moving metal liquid flow on the low-temperature substrate to directly prepare metal parts with uniform and fine structure, and has the advantages of low cost, short process and high efficiency.

Description

technical field [0001] The invention belongs to the technical field of metal preparation, and in particular relates to a metal structure refinement method based on metal liquid flow impact. [0002] technical background [0003] Microstructure refinement can significantly improve the strength and toughness of metals, and is an important means to improve the comprehensive performance of metals and expand the application field of metals. The main principles of metal structure refinement include increasing the nucleation rate, reducing the growth rate of crystal nuclei, increasing dendrite fragmentation, and recrystallization or phase transformation. Based on the above principles, the existing metal structure refinement methods mainly include chemical treatment, physical stirring / vibration refinement, rapid solidification and deformation heat treatment. All of the above methods can significantly refine the metal structure, but there are still the following problems: [0004] (...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F3/00B22F3/115
CPCB22F3/115C22F3/00
Inventor 刘雪峰李昂万祥睿
Owner UNIV OF SCI & TECH BEIJING