Fine-grain aluminum alloy material for wheel hubs and preparation method thereof

Abstract

The invention relates to a fine-grain aluminum alloy material for wheel hubs, which contains the following chemical components in percentage by mass: 4.2-4.5% of silicon, 5.6-5.8% of magnesium, 0.8-1.1% of titanium, 0.6-0.8% of boron, 0.12-0.15% of strontium, 0.15-0.18% of As, 0.08-0.12% of Hf, 0.5-0.8% of Bi and the balance of aluminum. By adding the titanium, boron, strontium and other elements, the aluminum alloy has the advantages of fine crystal grain, excellent properties and low production cost, and can satisfy the operating requirements for wheel hubs; by reasonably controlling the after-casting treatment temperature and feeding the alloy elements in batches, the alloy has uniform crystal and high strength; and by using part of scrap aluminum as the raw material, the alloy quality is more stable and uniform. When the refining agent is used for casting production, the porosity in the casting can be lowered by 1-2 degrees, the oxide inclusion content is Grade 2 or so, the air tightness of the casting is high, and the yield is high.

Description

technical field [0001] The invention relates to the field of aluminum alloy materials, in particular to a fine-grained aluminum alloy material for a wheel hub and a preparation method thereof. Background technique [0002] The quality and reliability of the wheels are not only closely related to the safety of the vehicle, but also closely related to the stability, comfort and safe operation of the vehicle during driving. Therefore, the wheel is required to have high precision in size and shape, good dynamic balance, high fatigue strength, good heat dissipation performance, good rigidity and elasticity. With the development of automobiles, the grades of automobiles are getting better and better, the speed of automobiles is getting faster and faster, and the requirements for individualization are getting higher and higher, so the requirements for automobile wheels are also getting higher and higher. [0003] Ordinary aluminum wheels are widely used in automobiles in our count...

AI Technical Summary

Problems solved by technology

[0005] The above-mentioned three-piece aluminum alloy forged wheels are often produced with 6 series (aluminum-magnesium-silicon) alloy materials, but because the ductility of the 6 series (aluminum-magnesium-silicon) alloy materials is not enough, the three-piece aluminum alloy forged wheels after production The scalability and automatic fatigue recovery functions are not up to the requirements

[0006] Aluminum alloys for wheel hubs in my country still have some problems, such as insufficient strength, heavy weight, poor processing performance, poor heat dissipation, limited effect of deterioration treatment, unstable casting quality, etc. It is necessary to further improve the comprehensive performance of aluminum alloys for wheel hubs