Research on the Effect of Ultrasonic Impact Peening on the Fatigue Property of 7075-T651 Aluminum Alloy
The fatigue property of friction stir welded joints in Ai7075-T651 is crucial adjective in the modern aerospace industry. Treated by the UIP (Ultrasonic impact peening) process using the self-made device, the effects are studied in this paper, and the results show that: under the stress ratio R=0.5, the fatigue life of welded joints treated by ultrasonic peening is prolonged by 8~14 times. The strengthened layer caused by the plastic variation, surface hardening and uniformity of tissue, and transversal residual stress of base metal after UIP becomeing compressive residual stress of 100 Mpa in the surface, which are the main reasons that lead to the improvement of fatigue property.
Pengcheng Wang, Liqun Ai, Yungang Li, Xiaoming Sang and Jinglong Bu
Q. L. Yang et al., "Research on the Effect of Ultrasonic Impact Peening on the Fatigue Property of 7075-T651 Aluminum Alloy", Advanced Materials Research, Vols. 295-297, pp. 1896-1900, 2011