Method for supergravity refining of metal solidification structure

A technology of metal solidification and supergravity, which is applied in the field of metal grain refinement, can solve problems such as potential safety hazards and contamination of molten metal, and achieve the effects of ensuring purity, low cost, and simple process flow

Inactive Publication Date: 2016-07-27
UNIV OF SCI & TECH BEIJING
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Problems solved by technology

However, the method of adding refiner has introduced other elements to a certain extent; the method of controlling the cooling system has been far from meeting the requirements of modern industrial production; external field and mechanical treatment are the hotspots in current research, but they also have their own limitations. Limitations, such as electric and magnetic fields have certain potential safety hazards, and mechanical stirring has the problem of polluting molten metal

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  • Method for supergravity refining of metal solidification structure
  • Method for supergravity refining of metal solidification structure
  • Method for supergravity refining of metal solidification structure

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Embodiment 1

[0034] In this embodiment, without loss of generality, Al-Cu (aluminum-copper) alloy is selected as the metal.

[0035] During the preparation of Al-Cu alloy, the industrial pure Al and industrial pure Cu selected can be any one known to those skilled in the art, for example: the metal Al block can be purchased from Beijing Cui Platinum Nonferrous Metals Technology Development Center. Al block, with a purity of 99.99%; industrially pure Cu may be an industrially pure Cu block purchased from Beijing Cui Platinum Nonferrous Metals Technology Development Center, with a purity of 99.99%.

[0036] Al-Cu master alloy preparation and supergravity treatment steps are as follows:

[0037] Step 1: Preparation of Al-Cu master alloy by smelting; take a proper amount of pure Al and pure Cu in an alumina crucible, heat up to 750°C in a molybdenum wire furnace protected by argon, and keep the temperature for not less than 2 hours to ensure that the alloy composition is uniform. After the he...

Embodiment 2

[0041] Except that centrifuge is adjusted to rotating speed in step 2 and is 1687r / min (coefficient of gravity is G=800) and carries out supergravity treatment, all the other are identical with embodiment 1.

[0042] Cut the obtained sample from the middle along the direction of supergravity, half of which have been inlaid, numbered, ground and polished, and etched with a mixed acid H 2 O+HNO 3 +HF=92+7.5+2.5 (unit: ml) erosion for 8-12s, then take pictures with a digital camera, observe the macroscopic structure of the sample, the results are as follows Figure 4 As shown, the microstructure of the sample was observed with a metallographic microscope, and the results were as follows Figure 5 shown.

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Abstract

The invention relates to the technical field of metal grain refinement, and discloses a method for supergravity refining of a metal solidification structure. The method comprises the steps that cooling solidification is conducted on a metal melt in a supergravity field, wherein the cooling solidification speed is the constant speed or the non-constant speed, the metal cooling speed ranges from 1 DEG C/min-10 DEG C/min, the supergravity field is achieved through rotation centrifuging of equipment, the gravity coefficient of the supergravity field is 1-800, and in the other words, the supergravity acceleration is 1g-800 g; and when the temperature of the metal melt is reduced to a liquid phase line, supergravity treatment is started, and when the temperature of the metal melt is reduced to the position lower than a solid phase line by 50 DEG C, supergravity treatment is stopped. The method has the beneficial effects that the moving gathering of a primary dendritic crystal, especially the rapid moving gathering of fine crystal nucleuses in the earlier stage of solidification in the supergravity field is greatly enhanced, and the metal solidification structure is rapidly and effectively refined; other elements are not guided in, and the purity degree of metal is guaranteed; and the technology process is simple, cost is low, environment friendliness is achieved, and the application prospect is wide.

Description

technical field [0001] The invention relates to the technical field of metal grain refinement, in particular to a method for refining metal solidification structure under high gravity. Background technique [0002] Refined metal solidification structure can improve the strength and toughness of metal materials at the same time. Researchers have been working on how to refine the solidification structure of metal materials to improve the comprehensive performance of materials. [0003] At present, the refinement of metal solidification structure can be realized in the following ways: adding refiner, controlling cooling system, external field and mechanical treatment. However, the method of adding refiner has introduced other elements to a certain extent; the method of controlling the cooling system has been far from meeting the requirements of modern industrial production; external field and mechanical treatment are the hotspots in current research, but they also have their ow...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F3/00C21D10/00
CPCC22F3/00C21D10/00
Inventor 宋波杨玉厚宋高阳
Owner UNIV OF SCI & TECH BEIJING
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