High-strength high-toughness aluminum-silicon alloy obtained by gravity casting and preparation method thereof

A gravity casting, aluminum-silicon alloy technology, applied in the field of aluminum alloy materials, can solve the problems of increasing process complexity and increasing production costs, and achieve the effects of improving mechanical properties, reducing content and good plasticity

Active Publication Date: 2014-10-15
GUANGDONG ZHAOQING POWER ACCESSORIES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the special casting process requires special equipment, which increases the complexity of the process and increases the production cost

Method used

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  • High-strength high-toughness aluminum-silicon alloy obtained by gravity casting and preparation method thereof
  • High-strength high-toughness aluminum-silicon alloy obtained by gravity casting and preparation method thereof
  • High-strength high-toughness aluminum-silicon alloy obtained by gravity casting and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Prepare and smelt the alloy material according to the composition of the aluminum-silicon alloy of the present invention, cast a batch of automobile brake caliper body castings by using the metal mold gravity casting process, and perform T6 heat treatment; the following table 1 is the ingredient list of step 1.

[0032] Table 1 The ingredients and content of Step 1

[0033]

[0034] Step 2: Smelting

[0035] Preheat A356 alloy, industrial pure aluminum and master alloy to 200°C. Add the A356 alloy and industrial pure aluminum into the melting furnace, and the alloy melting temperature is 720-730°C. When the A356 alloy and industrial pure aluminum are melted to a paste state, add the aluminum-silicon master alloy, and spread the covering agent (the weight percentage of the covering agent composition: 50% potassium chloride + 50% sodium chloride). About 4% of the total body mass. The alloy is completely melted after heat preservation for about 1 hour, and the alumin...

Embodiment 2

[0041] According to the composition of the aluminum-silicon alloy of the present invention, the smelted alloy material is prepared, a batch of automobile brake caliper body castings are poured by a metal mold gravity casting process, and T6 heat treatment is performed.

[0042] Step 1: Ingredients

[0043] Table 2 The ingredients and content of step 1

[0044]

[0045] Step 2: smelting; Step 3: heat treatment;

[0046] The processes of steps two and three are all the same as in Example one.

[0047]A batch of automobile brake caliper bodies was obtained through the above steps, and spectrometer analysis showed that the batch of casting materials contained 6.68% silicon, 0.19% magnesium, 0.13% iron, 0.07% copper, 0.10% titanium, 0.04% zinc, and 0.01% manganese. Strontium 0.008%, the rest is aluminum and a very small amount of unavoidable impurities. According to the national standard GB / T228-2002, the standard sample was taken for mechanical performance test results: tens...

Embodiment 3

[0049] Prepare and smelt the alloy material according to the composition of the aluminum-silicon alloy of the present invention, cast a batch of communication fastener castings by using the metal mold gravity casting process, and perform T6 heat treatment; Table 3 The ingredients and contents of Step 1.

[0050] Table 3 Step 1: Ingredients

[0051]

[0052] Step 2: smelting; Step 3: heat treatment process;

[0053] The processes of steps two and three are all the same as in Example one.

[0054] The room temperature tensile mechanical properties of the alloy of the present invention and some aluminum-silicon alloys with similar silicon content are compared in the following table, and the following table 4 is a comparison table of alloy properties.

[0055] Table 4 Alloy performance comparison table

[0056]

[0057] A batch of communication fasteners was obtained through the above steps, and spectrometer analysis revealed that the batch of casting materials contained 6...

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Abstract

The invention discloses a high-strength high-toughness aluminum-silicon alloy prepared by a metal-type gravity casting technology and a T6 (solid solution+completely artificial aging) heat treatment technology. The high-strength high-toughness aluminum-silicon alloy mainly comprises 6.60-7.40wt% of silicon, 0.18-0.20wt% of magnesium, 0.06-0.08wt% of copper, 0.07-0.10wt% of titanium, 0.035-0.040wt% of zinc, 0.012-0.013wt% of manganese, 0.008-0.009wt% of strontium, less than or equal to 0.16wt% of iron as an impurity element, less than or equal to 0.002wt% of other trace elements and the balance aluminum. The high-strength high-toughness aluminum-silicon alloy has good casting performances and high mechanical properties, is free of a special alloy element or a special preparation technology, is prepared from the raw materials having a low cost and convenient for acquisition and preparation, is especially suitable for manufacture of light components having high strength and toughness demands and is suitable for popularization application in the automobile component manufacturing industry.

Description

technical field [0001] The invention relates to an aluminum alloy material, in particular to a high-strength and tough gravity-cast aluminum-silicon alloy with excellent mechanical properties and good casting formability and a preparation method thereof. Background technique [0002] With its high specific strength, excellent corrosion resistance and other advantages, aluminum alloy gradually replaces the denser cast iron, and has been widely used in automobiles, aviation and other fields. [0003] Among aluminum alloys, aluminum-silicon-based cast aluminum alloys have good casting properties, corrosion resistance and mechanical properties, and thus become the most widely used cast aluminum alloys. In actual production and application, even after modification, the mechanical properties of aluminum-silicon alloys are still significantly lower than those of cast iron and aluminum-copper cast aluminum alloys. For example, the commonly used A356 aluminum alloy has excellent cas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/02
Inventor 何韶胡志伟郭锦强李维明赵海东邹纯
Owner GUANGDONG ZHAOQING POWER ACCESSORIES
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