Research on the Effect of Ultrasonic Impact Peening on the Fatigue Property of 7075-T651 Aluminum Alloy

Qiu Lin Yang; Dong Po Wang; Shi Pin Wu; Sen Li

doi:10.4028/www.scientific.net/AMR.295-297.1896

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 295-297Research on the Effect of Ultrasonic Impact...

Research on the Effect of Ultrasonic Impact Peening on the Fatigue Property of 7075-T651 Aluminum Alloy

Abstract:

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.

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Periodical:

Advanced Materials Research (Volumes 295-297)

Pages:

1896-1900

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.295-297.1896

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Online since:

July 2011

Authors:

Qiu Lin Yang, Dong Po Wang, Shi Pin Wu, Sen Li

Keywords:

7075-T651 Aluminum Alloy, Fatigue Property, Friction Stir Welding (FSW), Ultrasonic Impact Peening

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