Rare earth aluminum alloy bar for forging aluminum alloy hub and preparation method of rare earth aluminum alloy bar

Abstract

The invention discloses a rare earth aluminum alloy bar for forging an aluminum alloy hub. The rare earth aluminum alloy bar comprises, by mass, 0.6%-0.8% of Si, 0.15%-0.25% of Fe, 0.2%-0.3% of Cu, 0.06%-0.10% of Mn, 0.8%-1.2% of Mg, 0.2%-0.3% of Cr, smaller than or equal to 0.05% of Zn, 0.02%-0.06% of Ti, 0.05%-0.20% of LaCe mixed rare earth and the balance Al. The invention further discloses a preparation method of the rare earth aluminum alloy bar for forging the aluminum alloy hub. The lanthanum and cerium rare earth elements mixed in a certain proportion are added into the aluminum alloy, so that the alloy structure of the rare earth aluminum alloy bar is improved, and the strength and plasticity are improved.

Description

technical field [0001] The invention belongs to the field of aluminum alloy materials and their manufacture, and in particular relates to a 6061 rare earth aluminum alloy bar for forging aluminum alloy wheels and a preparation method thereof. Background technique [0002] 6061 aluminum alloy is a high-quality aluminum alloy product produced by heat treatment and pre-stretching process. Cr: 0.04-0.35, titanium Ti: 0.15, silicon Si: 0.4-0.8, iron Fe: 0.7, and the balance is aluminum Al. The blanks used for the forged wheels come from aluminum alloy cast rods produced by semi-continuous casting. With the progress of science and technology in our country and the combination of production, learning and research, the production quality of aluminum alloy cast rods has been greatly improved, but compared with the advanced level of foreign countries, there is still a big gap between the quality and the outstanding problem is the uniformity of performance And the stability is low, a...

AI Technical Summary

Problems solved by technology

Coarse grains lead to a series of problems such as reduced plastic forming ability of cast rods, reduced extrusion speed, increased extrusion force, reduced mold life, long production cycle, and increased costs.

For example, a set of extrusion dies for foreign 6061 extrusion profiles can extrude about 100 tons of profiles, while in China, due to the control problems of the structure and composition of the original 6061 extrusion ingot billet, if the extrusion is less than 20 tons of profiles, it is necessary to replace the extrusion die

For 6061 forged wheels, due to the coarse and uneven grains of the original blank, the stress of the forged wheels in the later stage is too high, the scrap rate is too high, and the service life of some wheels is short.

In order to obtain a finer and more uniform grain structure, grain refining AlTiB is often added in the semi-continuous casting process, but due to the unstable quality of domestic AlTiB, the refining effect is not good

The quality of imported AlTiB is stable, but the price is high, the refining effect is limited, and it is difficult to reach the grain size of foreign 6061 terminal materials

Therefore, high-quality 6061 alloy still relies heavily on imports, and is extremely passive in technology

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