Effect of Shot Peening on Fatigue Behavior of 7055-T77 Aluminum alloy

Author:  Jilai, Ru and Renzhi, Wang
Source:  The Shot Peener magazine, Vol 21/ No 4 Fall 2007 - From the Industry News section on page 35.
Doc ID:  2007024
Year of Publication:  2007
Abstract:  
The effect of shot peening on 7055-T77 aluminum alloy has been investigated. 7055-T77 is a high strength alloy with microstructure of coarse grains and a pronounced metallurgical texture, both resulting from its thermomechanical processing. Considerable improvement of fatigue strength was achieved with the changes of microstructure and the introduction of compressive residual stresses via shot peening. An x-ray diffraction photographic method was found very useful to measure the depth of the shot peening plastic deformation layer which otherwise is very difficult to measure by customary diffraction methods because of the microstructure and texture.. Keywords: shot peening; texture, fatigue, residual stresses