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Method for strengthening surface of 2024 aluminum alloy

A surface strengthening, aluminum alloy technology, applied in the field of shot peening, can solve the problem of difficult to meet the performance requirements of 2024 aluminum alloy parts, and achieve the effect of improving shot peening efficiency, high shot peening coverage and less material damage

Pending Publication Date: 2021-11-02
ZHONGBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Xu Yansong and others have studied the effect of shot peening on the fatigue performance of 2024 aluminum alloy. The results show that the median fatigue life of the specimen after shot peening is 1.53 to 2.55 times that of the specimen without shot peening. , but it is still difficult to meet the performance requirements of 2024 aluminum alloy parts in some special industries

Method used

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  • Method for strengthening surface of 2024 aluminum alloy
  • Method for strengthening surface of 2024 aluminum alloy
  • Method for strengthening surface of 2024 aluminum alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) The 2024 aluminum alloy thick plate was prepared into a tensile sample along the rolling direction. Before the test, the sample was ground and polished with silicon carbide sandpaper, and cleaned with alcohol.

[0034] (2) Put the prepared tensile sample on the fixture of the shot peening device for shot peening. Shot peening parameters are as follows: Shot peening angle: 90°, double-sided single nozzle spraying; flow rate: 10kg / min; shot peening distance: 500mm; moving speed: 3.0m / min; injection pressure 0.4MPa; projectiles are carbon steel projectiles , the particle size is 3.18mm, and the shot peening time is 30min.

Embodiment 2

[0036] (1) The 2024 aluminum alloy thick plate was prepared into a tensile sample along the rolling direction. Before the test, the sample was ground and polished with silicon carbide sandpaper, and cleaned with alcohol.

[0037] (2) Put the prepared tensile sample on the fixture of the shot peening device for shot peening. Shot peening parameters are as follows: Shot peening angle: 90°, double-sided single nozzle spraying; flow rate: 10kg / min; shot peening distance: 500mm; moving speed: 3.0m / min; injection pressure 0.5MPa; projectiles are carbon steel projectiles , the particle size is 3.18mm, and the shot peening time is 30min.

Embodiment 3

[0039] (1) The 2024 aluminum alloy thick plate was prepared into a tensile sample along the rolling direction. Before the test, the sample was ground and polished with silicon carbide sandpaper, and cleaned with alcohol.

[0040] (2) Put the prepared tensile sample on the fixture of the shot peening device for shot peening. Shot peening parameters are as follows: Shot peening angle: 90°, double-sided single nozzle spraying; flow rate: 10kg / min; shot peening distance: 500mm; moving speed: 3.0m / min; injection pressure 0.6MPa; projectiles are carbon steel projectiles , the particle size is 3.18mm, and the shot peening time is 30min.

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Abstract

The invention provides a method for strengthening the surface of 2024 aluminum alloy, and relates to the technical field of shot peening strengthening, in particular to a shot peening process method for strengthening the aluminum alloy. According to the method, by controlling the shot peening flow, the shot peening distance, the moving speed and the shot peening pressure, a large number of crystal defects and strain are generated on the surface of the 2024 aluminum alloy, the surface stress of the material is increased, stress relief annealing is carried out, the size and the shape are stabilized, and high strength and hardness are kept, so that the mechanical property of the 2024 aluminum alloy is improved. A double-nozzle opposite-spraying type shot peening machine is adopted, the shot peening efficiency is greatly improved, the coverage rate is high, the prepared tensile sample can be directly subjected to complete shot peening treatment, and damage to materials is small. The sample after shot peening is subjected to heat treatment and disappears through vacancy migration to a grain boundary, dislocation or combination with interstitial atoms, and the vacancy concentration is remarkably reduced. After shot peening and heat treatment, the microscopic strain of the alloy surface is greatly increased, and the yield strength, the tensile strength and the ductility are greatly improved.

Description

technical field [0001] The invention relates to the technical field of shot peening, in particular to a shot peening method for strengthening the mechanical properties of aluminum alloys. Background technique [0002] 2024 aluminum alloy is a hard aluminum alloy that can be strengthened by heat treatment. It has the advantages of high strength, low specific gravity, good heat resistance and fatigue strength. It is a typical high-strength structural aluminum alloy with excellent comprehensive performance. In the field of aerospace, such as aircraft skeletons, rib beams, bulkheads, propeller components, space satellites and other spacecraft, and some commercial and civilian products, such as rivets, truck wheels, etc., are widely used. [0003] Up to now, as an effective means, shot peening is mostly used to improve the fatigue strength and other properties of materials. Xu Yansong and others have studied the effect of shot peening on the fatigue performance of 2024 aluminum ...

Claims

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Application Information

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IPC IPC(8): C22C21/18C22F1/057
CPCC22C21/18C22C21/16C22C21/14C22F1/057
Inventor 董瑞峰李晨晖刘东张晓阳赵宇宏侯华
Owner ZHONGBEI UNIV
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