超声波喷丸对7B04-T651铝合金应力腐蚀行为影响

孙强

doi:10.7643/ issn.1672-9242.2026.05.008

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装备环境工程 ›› 2026, Vol. 23 ›› Issue (5) : 64-72. DOI: 10.7643/ issn.1672-9242.2026.05.008

航空航天装备

超声波喷丸对7B04-T651铝合金应力腐蚀行为影响

孙强

作者信息 +

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

SUN Qiang

Author information +

文章历史 +

摘要

目的解决以7B04铝合金为主要结构材料的某型航空装备主体结构应力腐蚀开裂风险高,影响装备结构完整性与服役可靠性的典型失效问题。方法采用超声喷丸的方式对7B04-T651铝合金在装配前进行残余应力释放,通过监测应力腐蚀开裂裂纹扩展规律、处理前后金相组织、电化学耐蚀性能、微区电化学行为等表征,结合基于COMSOL多物理场的数值仿真结果,研究超声喷丸对铝合金应力腐蚀行为的影响。结果基准试件的裂纹最早从第3循环开始萌生,到第7循环后裂纹扩展速率趋于平缓,约为2.81 mm/循环。超声喷丸试件的裂纹最早萌生在第6循环,裂纹长度呈现线性增大,平均裂纹扩展速率为2.01 mm/循环。结论超声喷丸的方式有助于缓解7B04-T651铝合金应力腐蚀行为,超声波喷丸与基准件对比,对应力腐蚀的缓解效率约为11%,能够使得裂纹萌生周期推迟2个周期以上,同时也使得基体材料耐蚀性能提高36%。

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%.

导出引用

孙强. 超声波喷丸对7B04-T651铝合金应力腐蚀行为影响[J]. 装备环境工程. 2026, 23(5): 64-72 https://doi.org/10.7643/ issn.1672-9242.2026.05.008

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

中图分类号： TG172

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