Effect of Ultrasonic Peening on Stress Corrosion Behavior of 7B04-T651 Aluminum Alloy

SUN Qiang

doi:10.7643/ issn.1672-9242.2026.05.008

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Equipment Environmental Engineering ›› 2026, Vol. 23 ›› Issue (5) : 64-72. DOI: 10.7643/ issn.1672-9242.2026.05.008

Aviation and Aerospace Equipment

Effect of Ultrasonic Peening on Stress Corrosion Behavior of 7B04-T651 Aluminum Alloy

SUN Qiang

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Abstract

The work aims to address the typical failure of high stress corrosion cracking risks in the main structure of a certain type of aviation equipment with 7B04 aluminum alloy as the main structural material, which affects the structural integrity and service reliability of the equipment. Ultrasonic shot peening was adopted to release the residual stress of 7B04-T651 aluminum alloy before assembly. By monitoring the crack propagation law of stress corrosion cracking, metallographic structure before and after treatment, electrochemical corrosion resistance, micro-area electrochemical behavior and other characterizations, combined with the numerical simulation results based on COMSOL multi-physical field, the effect of ultrasonic shot peening on the stress corrosion behavior of aluminum alloy was studied. The crack of the reference specimen initiated at the 3rd cycle at the earliest, and the crack propagation rate tended to be gentle after the 7th cycle, about 2.81 mm/cycle. The crack of the ultrasonic shot peening specimen initiated at the 6th cycle at the earliest, and the crack length increased linearly, with an average crack propagation rate of 2.01 mm/cycle. In conclusion, ultrasonic shot peening is helpful to alleviate the stress corrosion behavior of 7B04-T651 aluminum alloy. Compared with the reference specimen, the mitigation efficiency of ultrasonic shot peening on stress corrosion is about 11%, which can delay the crack initiation cycle by more than 2 cycles, and also improve the corrosion resistance of the matrix material by 36%.

Key words

7B04 aluminum alloy / ultrasonic shot peening / periodic immersion / electrochemical analysis / corrosion simulation / stress corrosion

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SUN Qiang. Effect of Ultrasonic Peening on Stress Corrosion Behavior of 7B04-T651 Aluminum Alloy[J]. Equipment Environmental Engineering. 2026, 23(5): 64-72 https://doi.org/10.7643/ issn.1672-9242.2026.05.008

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