Large-sized hypereutectic high-seleium aluminium alloy billet and preparation method thereof

A high-silicon aluminum alloy and hypereutectic technology, which is applied in the field of large-size hypereutectic high-silicon aluminum alloy billets and their preparation, can solve problems such as lack of courage to explore and overcome.

Inactive Publication Date: 2006-06-21
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

First, aluminum-silicon alloy is a casting alloy, which is not traditionally used as a deformed aluminum alloy. Second, it is authoritatively asserted that it is impossible to prepare a hypereutectic aluminum-silicon alloy with a fine microstructure larger than 10mm, which makes people have no courage to explore and beyond its assertion

Method used

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  • Large-sized hypereutectic high-seleium aluminium alloy billet and preparation method thereof
  • Large-sized hypereutectic high-seleium aluminium alloy billet and preparation method thereof
  • Large-sized hypereutectic high-seleium aluminium alloy billet and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The selected equipment is self-made equipment, and the structural principle is shown in figure 1 , in the figure 1 cooling water, 2 crystallizer, 3 billet, 4 hot top, 5 graphite ring. The size of the cast billet obtained was a round billet with a diameter of 103 mm and a length of 550 mm.

[0035] The process parameters are:

[0036] Alloy composition: Si15.0% by weight, Fe 0.29% by weight, Cu 0.02% by weight, Al balance;

[0037] Casting temperature: 720°C;

[0038] Vertical traction speed: 85mm / min;

[0039] The amount of cooling water around the solidified billet: 10g / mm.s.

[0040] Metallographic results see figure 2 , 3 , the metallographic results after corroding the aluminum substrate are shown in Figure 4 , it can be seen that the Si particles grow continuously in the three-dimensional direction.

[0041] The heat treatment process parameters are:

[0042] Heating rate: 5°C / min;

[0043] Heating temperature: 450°C, 500°C, 550°C;

[0044] Holding tim...

Embodiment 2

[0047] The selected equipment is self-made equipment, and the structural principle is shown in figure 1 . The size of the cast billet obtained was a round billet with a diameter of 110 mm and a length of 550 mm.

[0048] The process parameters are:

[0049] Alloy composition: Si 20% by weight, Fe 0.39% by weight, Cu 0.017% by weight, Al balance;

[0050] Casting temperature: 820°C;

[0051] Vertical traction speed: 75mm / min;

[0052] The amount of cooling water around the solidified billet: 7g / mm.s.

[0053] Metallographic results see Figure 15 .

[0054] The heat treatment process parameters are:

[0055] Heating rate: 5°C / min;

[0056] Heating temperature: 550°C;

[0057] Holding time: 30 minutes;

[0058] Metallographic results see Figure 16 .

Embodiment 3

[0060] The selected equipment is self-made equipment, and the structural principle is shown in figure 1 . The size of the cast billet obtained is a round billet with a diameter of 80 mm and a length of 5450 mm.

[0061] The process parameters are:

[0062] Alloy composition: Si 30% by weight, Fe 0.23% by weight, Cu 0.015% by weight, Al balance;

[0063] Casting temperature: 1000°C;

[0064] Vertical traction speed: 120mm / min;

[0065] The amount of cooling water around the solidified billet: 15g / mm.s.

[0066] The heat treatment process parameters are:

[0067] Heating rate: 5°C / min;

[0068] Heating temperature: 550°C;

[0069] Holding time: 30 minutes;

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Abstract

The invention provides a large scale hypereutectic high-silicon aluminum alloy blank, whose cross-sectional area is between 600-150000mm2, the Si content in the alloy is 13.5-30wt%, it has homogeneous and fine microstructure structure, the Si particles are in dispersed distribution with an average size of less than 5um. The preparing process consists of making ingot blank through semi-continuous casting method, then carrying out subsequent heat treatment for Si particles discretization, finally regulating Si particle size through thermal treatment.

Description

Technical field: [0001] The invention relates to the preparation technology of aluminum alloy, and in particular provides a large-size hypereutectic high-silicon aluminum alloy blank and a preparation method thereof. Background technique: [0002] Aluminum-silicon alloys, especially hypereutectic aluminum-silicon alloys with Si>12.7% by weight, are widely used in the automotive industry, aerospace and aviation industries due to their high strength, high wear resistance, high corrosion resistance and low thermal expansion coefficient. There are a wide range of applications. However, for hypereutectic alloys, the general solidification preparation method is difficult to eliminate the coarse blocky pre-precipitated Si particles and lath-like eutectic structure, resulting in poor strength and high brittleness of the alloy, which limits the application of the alloy. People then search for a method of rapid solidification, but because rapid solidification can only obtain block...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/02B22D11/00B22D11/16C22F1/043
Inventor 于福晓崔建忠秦克孙振国王话
Owner NORTHEASTERN UNIV
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