Method for local remelting reinforcement of aluminum alloy part

Abstract

The invention discloses a method for local remelting reinforcement of an aluminum alloy part. The method comprises the following steps that a, two kinds of powder, namely pre-feeding powder and alloy powder added with alloy elements is prepared; and b, the aluminum alloy part is subjected to laser remelting, specifically, b1, the pre-feeding powder is conveyed to the position, needing to be remelted, of the aluminum alloy part, and a covering layer is formed; and b2, an annular laser beam is adopted for laser heating, an alloy powder pipe is arranged in the center of the annular laser beam, the annular laser beam is focused in the remelting area for heating, after a molten pool is formed, in-light powder feeding is carried out through the alloy powder pipe, alloy powder is fed into the molten pool, alloy elements in the alloy powder are rapidly fused into molten liquid of the molten pool, and a remelting part is obtained. According to the method for local remelting reinforcement of the aluminum alloy part, powder is fed in laser light, and reinforcing elements such as iron, chromium, copper and nickel in the alloy powder are molten into a remelting area, so that the strength, especially the high-temperature strength, of the remelting part is greatly improved.

Description

technical field [0001] The invention relates to the technical field of manufacturing aluminum alloy parts, in particular to a method for local remelting enhancement of aluminum alloy parts. Background technique [0002] At present, with the vigorous development of new technologies, the demand for lightweight is becoming more and more strong. At present, the aluminum alloy material is the first choice for lightweight, and it can replace cast iron, alloy steel and other materials in practical applications, but the biggest weakness of aluminum alloy is its poor mechanical properties. Lower, up to 20-30% of high-strength steel. The high-temperature strength is even worse, for example, the high-temperature strength at 350 degrees is only about 10% of high-strength steel, and the normal-temperature strength and high-temperature strength of aluminum alloys decrease significantly with time, thus limiting its application range. [0003] Taking pistons as an example, ceramic composi...

AI Technical Summary

Problems solved by technology

For example, the existing piston throat remelting technology, alumina ceramic fiber reinforcement and other technologies can withstand the explosion pressure of 22MPa, but the piston will be difficult to withstand the explosion pressure exceeding 22MPa

The remelting of the existing piston throat is essentially to refine the original matrix, so that the thermal performance of the material is significantly improved, and the material composition of the remelted part does not change, and the effect of material composition modification and enhancement has not been realized. Therefore, its overall impact Limited

The internal cooling channel of the ceramic fiber reinforced piston is formed by a salt core under high pressure, and the salt core is easy to infiltrate the aluminum liquid and squeeze out deformation under high pressure, which makes it difficult to manufacture the piston of the ceramic fiber reinforced internal cooling channel. Therefore, the aluminum oxide ceramic fiber reinforced the whole The industrial application of pistons faces many challenges, which have not been completely resolved after three to forty years

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