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Method for refining hypo eutectic aluminum-silicon alloy structure

A technology for refining hypoeutectic and aluminum-silicon alloys, applied in the field of refining aluminum-silicon alloys, can solve the problems of affecting the purity and performance of the alloy, affecting the microstructure and performance of materials, production and social environmental pollution, and eliminating the heat treatment process. , easy to operate, and quick to prepare

Inactive Publication Date: 2013-04-24
ANHUI RUNXIN TAIDA INTELLIGENT SYST ENGCO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although part of the coarse phases will be fragmented in the subsequent deformation process, the residual phases will be distributed along the rolling direction, seriously affecting the final microstructure and properties of the material; Other impurity elements will be introduced after dosing, affecting the purity and performance of the alloy, and the metamorphic substances often cause serious pollution to production and social environment

Method used

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  • Method for refining hypo eutectic aluminum-silicon alloy structure
  • Method for refining hypo eutectic aluminum-silicon alloy structure
  • Method for refining hypo eutectic aluminum-silicon alloy structure

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Effect test

Embodiment 1

[0016] Such as figure 1 As shown, the operation steps for refining the Al-Si alloy structure are:

[0017] (1) Put the aluminum-silicon alloy billet into a box-type resistance furnace and heat it to 720 degrees to melt the billet;

[0018] (2) Keep warm for 10 minutes to make the melt structure uniform;

[0019] (3) Take it out of the box, and quickly pour the aluminum-silicon alloy melt in a liquid nitrogen environment to rapidly cool the aluminum-silicon alloy and solidify it into shape.

[0020] The sample is made into a metallographic sample, and the microstructure is observed with an OLYMPUSBX51 metallographic microscope, and the obtained metallographic diagram (such as figure 2 ), it can be seen that there are many eutectic structures, and they are evenly distributed. The size is about 3μm-15μm. image 3 In order to compare the metallographic diagram of the sample, it can be seen that the eutectic structure of the sample is very coarse.

Embodiment 2

[0022] Such as figure 1 As shown, the operation steps for refining the Al-Si alloy structure are:

[0023] (1) Put the billet of AC4B aluminum-silicon alloy into a box-type resistance furnace and heat it to 670 degrees to melt the billet;

[0024] (2) Keep warm for 15 minutes to make the melt structure uniform;

[0025] (3) Take it out of the box, and quickly pour the aluminum-silicon alloy melt in a liquid nitrogen environment to rapidly cool the aluminum-silicon alloy and solidify it into shape.

Embodiment 3

[0027] Such as figure 1 As shown, the operation steps for refining the Al-Si alloy structure are:

[0028] (1) Put the aluminum-silicon alloy billet into a box-type resistance furnace and heat it to 700 degrees to melt the billet;

[0029] (2) Keep warm for 20 minutes to make the melt structure uniform;

[0030] (3) Lower the temperature of the furnace to the temperature of the two-phase zone, such as 630 degrees, and keep it warm for 10 minutes;

[0031] (4) Take it out of the box, and quickly pour the aluminum-silicon alloy melt in a liquid nitrogen environment to rapidly cool the aluminum-silicon alloy and solidify it into shape.

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Abstract

The invention discloses a method for refining a hypo eutectic aluminum-silicon alloy structure. The method comprises the steps of: firstly melting down an aluminum-silicon alloy; then casting rapidly, solidifying and shaping the melt aluminum-silicon alloy in a liquid nitrogen environment. The method for refining the hypo eutectic aluminum-silicon alloy structure has the advantages of being simple in operation, safe and environment-friendly, obvious in refining effects and fast to prepare. A relatively large number of eutectic structures which are distributed uniformly, have compact and fine organization and have low cutting function for a basal body can be obtained after the AC4B aluminum-silicon alloy is cooled by liquid nitrogen, so that the hardness of the aluminum alloy is up to 148 HBS. The AC4B aluminum-silicon alloy which is obtained by being cooled rapidly in the liquid nitrogen environment has a size of about 3 microns to 15 microns. The crystal particle structure is fine; and the edges and corners of the crystal particles are passivated and smooth.

Description

technical field [0001] The invention relates to a non-ferrous metal casting method, in particular to a method for refining the aluminum-silicon alloy structure. Background technique [0002] Aluminum-silicon alloy has relatively low density, but relatively good strength, close to or exceeding high-quality steel, good plasticity, can be processed into various profiles, has excellent electrical conductivity, thermal conductivity and corrosion resistance, and has good mechanical properties. It is widely used, second only to steel in usage. [0003] Since the eutectic silicon appears in the form of coarse needle flakes and strips, the primary silicon is in the form of thick polygonal blocks and strips, and the coarse silicon phase severely splits the matrix, resulting in stress concentration and reducing the strength and plasticity of the alloy. , is not conducive to the actual use and promotion of aluminum-silicon alloys. For the problems faced by silicon-aluminum alloys, it ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/02C22C21/02
Inventor 陶锋王志俊陶硕朱贵春胡从荣
Owner ANHUI RUNXIN TAIDA INTELLIGENT SYST ENGCO
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