Method for modification and refinement of hypoeutectic and eutectic Al-Si alloy

A eutectic aluminum-silicon and aluminum-silicon alloy technology, which is applied in the field of aluminum alloy smelting and casting, can solve the problems of immaturity, deterioration and accelerated decline of refinement, and difficulty in obtaining fine fibrous eutectic structure at the same time, so as to achieve easy operation , low-cost effect

Active Publication Date: 2014-08-13
CHINA NON-FERROUS METALS PROCESSING TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Again, some studies have found that for Al-Si alloys, when Sr, Ti, and B exist in the melt at the same time, it is easy to form SrB 6 and TiB 2 Particles, the density of these two kinds of particles is much higher than that of molten aluminum, and they are prone to deposition, resulting in accelerated deterioration and refinement decline.
[0007] To sum up, the grain refinement and modification methods for the industrial production of hypoeutectic and eutectic Al-Si alloy ingots are still immature, and it is difficult to simultaneously obtain fine α-Al equiaxed grain structure and fine fibrous grain structure. eutectic structure

Method used

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  • Method for modification and refinement of hypoeutectic and eutectic Al-Si alloy

Examples

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Embodiment 1

[0053] Example 1: Modification and refinement of hypoeutectic Al-Si alloys. Hypoeutectic aluminum-silicon alloy, silicon content 6.5~7.5wt.%, detailed chemical composition as alloy A in Table 1.

[0054] The smelting equipment adopts a 15kg resistance furnace. Electrolytic aluminum and aluminum-silicon intermediate alloys are put into the melting furnace first. After the furnace material is completely melted, other alloying elements are added in the form of intermediate alloys or pure metals to control the composition of each alloying element. Keep the temperature of the melt at 650~850℃, add Al-Sr master alloy so that the mass of strontium in the melt is 0.005~0.1% of the total mass of the melt; add Al-Sr master alloy and stir evenly; Inject high-purity inert gas for refining and degassing treatment, keep the melt temperature at 650~850°C during aeration, and aeration time for 10~40 minutes; after degassing treatment, let it stand for 10~30 minutes, remove scum; add Al-B in...

Embodiment 2

[0056] Example 2: Modification and refinement of hypoeutectic Al-Si alloys. Hypoeutectic aluminum-silicon alloy, silicon content 9~10wt.%, detailed chemical composition as alloy C in Table 1.

[0057] The smelting equipment adopts a 15kg resistance furnace. First, electrolytic aluminum and aluminum-silicon intermediate alloy are put into the smelting furnace in proportion, and the composition of each alloy element is controlled after the furnace charge is completely melted. Keep the temperature of the melt at 650~850℃, add Al-Sr master alloy so that the mass of strontium in the melt is 0.005~0.1% of the total mass of the melt; add Al-Sr master alloy and stir evenly; Inject high-purity inert gas for refining and degassing treatment, keep the melt temperature at 650~850°C during aeration, and aeration time for 10~40 minutes; after degassing treatment, let it stand for 10~30 minutes, remove scum; add Al-B in the middle Alloy, so that the mass of boron in the melt is 0.005~0.1%...

Embodiment 3

[0064] Example 3: Modification and refinement of eutectic Al-Si alloy ingots. The content of the eutectic aluminum-silicon alloy is 11.0~13.5wt.%, and the detailed chemical composition is as alloy D in Table 1. The specific implementation method of the present invention will be described below by taking the modification and refinement treatment in the semi-continuous casting production process of the Φ300mm ingot of alloy D as an example.

[0065] The smelting equipment adopts a 500kg resistance furnace. Electrolytic aluminum and polysilicon or aluminum-silicon intermediate alloys are put into the melting furnace first. After the furnace material is completely melted, other alloying elements are added in the form of intermediate alloys or pure metals to control the composition of each alloying element. Keep the melt temperature at 650~850℃, add Al-Sr master alloy so that the mass of strontium in the melt is 0.005~0.1% of the total mass of the melt; add Al-Sr master alloy and...

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Abstract

The invention relates to a method for modification and refinement of a hypoeutectic and eutectic Al-Si alloy. The hypoeutectic and eutectic Al-Si alloy with the Si content of 2-13.5 wt.% is subjected to modification and refinement treatment with Sr and B; after treatment, the Sr content in an alloy melt is 0.005-0.1%, the B content is 0.005-0.1%, and the mass ratio of Sr to B is 0.3-5. An Al-B intermediate alloy is used as a refiner, and has excellent grain refining effect on the Al-Si alloy; an Al-Sr intermediate alloy is used as a modifier, can effectively modify eutectic Si in the Al-Si alloy. By controlling melting, modification and refinement treatment processes, the grain refiner also has good refinement effect on alpha-Al while the added modifier has good modification effect on the eutectic Si, so that an ingot microstructure is simultaneously modified and refined, and a mutual poisoning effect between Sr and B can be effectively avoided.

Description

technical field [0001] The invention relates to a method for modifying and refining treatment of hypoeutectic and eutectic aluminum-silicon alloy ingots, and belongs to the technical field of aluminum alloy smelting and casting. Background technique [0002] Aluminum-silicon alloys have the advantages of light weight, high strength, high wear resistance, high heat resistance, and excellent volume stability, and are widely used in machinery, automobiles, and other fields. [0003] The typical structure of aluminum-silicon alloy includes α-Al, primary silicon, eutectic silicon and a small amount of alloy phase. Among them, primary silicon and eutectic silicon are brittle phases, and their shape, size and distribution are the main factors affecting the mechanical properties of the alloy. In the unmodified aluminum-silicon alloy, the primary silicon is distributed in coarse irregular blocks, and the eutectic silicon is in the shape of elongated needles. Under load, the tip and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/06C22C21/04
Inventor 长海博文朱光磊吴永福李新涛纪黎
Owner CHINA NON-FERROUS METALS PROCESSING TECH CO LTD
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