Method for local remelting reinforcement of aluminum alloy part

A technology of aluminum alloy parts and aluminum alloy powder, applied in the field of aluminum alloy parts manufacturing, can solve the problems of unbearable piston, limited influence, difficult manufacturing of ceramic fiber reinforced inner cooling channel piston, etc.

Pending Publication Date: 2021-09-07
BINZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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 real

Method used

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  • Method for local remelting reinforcement of aluminum alloy part
  • Method for local remelting reinforcement of aluminum alloy part

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A method for local remelting reinforcement of aluminum alloy parts, comprising the following steps:

[0038] (1) Prepare powder

[0039] There are two types of powder, one is pre-feed powder, which is mainly to form a layer of coating powder with low reflectivity on the aluminum surface before laser heating, so as to reduce the reflectivity of laser. The other is alloy powder with alloying elements added.

[0040] Wherein, the pre-feeding powder is iron powder mixed with spherical graphite particles, the content of iron powder is 99.99%, and the content of graphite powder is 0.1%, by weight percentage; the particle size is 40 μm.

[0041] The alloy powder is a mixture of aluminum alloy powder, iron powder, and spherical graphite powder. The content of aluminum alloy powder is 98.2%, the content of iron powder is 1.75%, and the content of graphite powder is 0.05%, by weight percentage; the particle size is 60 μm.

[0042] Aluminum alloy powder uses aluminum-iron alloy ...

Embodiment 2

[0052] A method for local remelting reinforcement of aluminum alloy parts, comprising the following steps:

[0053] (1) Prepare powder

[0054] There are two types of powder, one is pre-feed powder, which is mainly to form a layer of coating powder with low reflectivity on the aluminum surface before laser heating, so as to reduce the reflectivity of laser. The other is alloy powder with alloying elements added.

[0055] Wherein, the pre-feeding powder is iron powder mixed with spherical graphite particles, the content of iron powder is 99.8%, and the content of graphite powder is 0.2%, by weight percentage; the particle size is 35 μm.

[0056] The alloy powder is a mixture of aluminum alloy powder, iron powder, and spherical graphite powder. The content of aluminum alloy powder is 98.3%, the content of iron powder is 1.6%, and the content of graphite powder is 0.1%, by weight percentage; the particle size is 80 μm.

[0057] Aluminum alloy powder uses aluminum-iron alloy as ...

Embodiment 3

[0067] A method for local remelting reinforcement of aluminum alloy parts, comprising the following steps:

[0068] (1) Prepare powder

[0069] There are two types of powder, one is pre-feed powder, which is mainly to form a layer of coating powder with low reflectivity on the aluminum surface before laser heating, so as to reduce the reflectivity of laser. The other is alloy powder with alloying elements added.

[0070] Wherein, the pre-feeding powder is iron powder mixed with spherical graphite particles, the content of iron powder is 99.85%, and the content of graphite powder is 0.15%, calculated by weight percentage; the particle size is 10-80 μm.

[0071] The alloy powder is a mixture of aluminum alloy powder, iron powder, and spherical graphite powder. The content of aluminum alloy powder is 96.5%, the content of iron powder is 3.43%, and the content of graphite powder is 0.07%, by weight percentage; the particle size is 100 μm.

[0072] Aluminum alloy powder uses alum...

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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...

Claims

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Application Information

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IPC IPC(8): C23C24/10
CPCC23C24/103Y02P10/25
Inventor 章健刘世英冯增建刘敬张森邓立君成恩超邱玉伟
Owner BINZHOU UNIV
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