Vibration fatigue performance improvement in 2024-T351 aluminum alloy by ultrasonic-assisted laser shock peening. (March 2023)

• Record Type: Journal Article
• Authors: Meng, Xiankai; Leng, Xumin; Shan, Chong; Zhou, Liucheng; Zhou, Jianzhong; Huang, Shu; Lu, Jinzhong
• Is Part Of: International journal of fatigue. Volume 168(2023)
• Publication Date: 2023-03
• Subjects: Ultrasonic-assisted laser shock peening -- Aluminum alloy -- Vibration fatigue life -- Crack propagation -- Stress intensity factor; Materials -- Fatigue -- Periodicals; Materials -- Fatigue; Periodicals; 620.1122
• DOI: 10.1016/j.ijfatigue.2022.107471
• Languages: English
• ISSNs: 0142-1123

Abstract

Highlights: Microstructure evolution of LPed, UPed and ULPed specimens was analyzed. Residual stress and microhardness of LPed, UPed and ULPed specimens were investigated. Vibration fatigue damage and fracture mode of LPed, UPed and ULPed specimens was studied. Strengthening mechanism of ULP treatment on vibration fatigue resistance was proposed. Abstract: To improve the fatigue resistance of 2024-T351 aluminum alloys, ultrasonic-assisted laser shock peening (ULP) was proposed in this study, which combined ultrasonic shock peening (UP) and laser shock peening (LP) for improving the microstructure and mechanical properties. The microstructure, residual stress, and microhardness of four specimen types—untreated, UPed, LPed, and ULPed—were tested, and their effects on vibration fatigue life were analyzed. The results show that the dislocation density is increased significantly, and the grains are obviously refined by ULP. Consequently, the amplitudes of compressive residual stress and microhardness are increased a lot by ULP to inhibit crack initiation and propagation, thus significantly increase the vibration fatigue life.