In-situ nanometer intensified aluminum alloy wheel hub for new energy automobile and manufacturing method thereof

Abstract

The invention relates to an in-situ nanometer intensified aluminum alloy wheel hub with light weight, high strength and fatigue resistance for a new energy automobile and a manufacturing method thereof. Through in-situ chemical reaction of a melted body, nanometer particle compound reinforcement is realized by Orowan reinforcement + refined crystalline reinforcement, long-term compound metamorphism and complex refinement are integrated, and the refined crystalline reinforcement is achieved. The purification technology of nitrogen and argon combined rotary air refining + aluminum-rear earth isadopted, multi-stage deep purification of aluminum melted body is realized, the characteristic that argon is greater than air in density is used for forming a protective layer on the surface of the melted body, and alloy is introduced between the aluminum-rear earth to produce intermediate compounds with the density greater than that of the particles, and therefore the deep high-efficiency purification is effectively achieved. A novel low pressure shaping technology of progressive solidification + rapid crystallization is adopted in the end, due to the fact that crystallization time is shortened, the space between secondary branch crystal arms in a casting microstructure is shortened, the structure is refined and the feeding effect is enhanced, the casting is denser in structure, and the wheel hub with high plasticity, high anti-fatigue performance and high density is obtained.

Description

technical field [0001] The invention relates to a light-weight, high-strength, anti-fatigue, in-situ nano-reinforced aluminum alloy wheel hub for new energy vehicles and a manufacturing method, belonging to the technical field of new energy vehicle wheel hub preparation. Background technique [0002] Currently, new energy vehicles represented by pure electric vehicles, hybrid vehicles, and fuel cell vehicles are growing rapidly around the world. However, due to factors such as battery weight and cruising range, new energy vehicles have more urgent requirements for lightweight. Studies have shown that new energy vehicles use lightweight high-strength aluminum alloy wheels instead of traditional aluminum wheels, which can reduce vehicle energy consumption by up to 3%. At the same time, since new energy vehicles are generally heavier than traditional vehicles of the same level, the loads on the wheels are greater, and the requirements for strength and fatigue resistance are hi...

AI Technical Summary

Problems solved by technology

However, the above-mentioned process technology still has the following shortcomings and deficiencies: (1) the use of a large number of expensive rare earth elements increases the cost of material manufacturing; (2) relying on traditional alloy precipitation strengthening to improve the strong plasticity of materials is limited, It is often to reduce the plasticity and improve the strength; (3) the content of rare earth is difficult to control, and excessive addition will reduce the performance of the material

However, the following problems are likely to exist in its manufacturing process: (1) the direct reaction method of the melt, the reaction residue is easy to remain in the melt, and it is easy to entrain air into the melt due to fluctuations in the melt; (2) the generated nanoparticles are easy to Agglomeration, uneven distribution, so prone to defects, low density

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