Effect of Shot Peen Forming with Large Balls on Fatigue Resistance of 2024-T351 Aluminum Alloy

Ming Tao Wang; Yuan Song Zeng; Jian Qin Shang; Xia Huang; Xue Piao Bai

doi:10.4028/www.scientific.net/AMR.816-817.266

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Effect of Shot Peen Forming with Large Balls on Fatigue Resistance of 2024-T351 Aluminum Alloy
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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 816-817Effect of Shot Peen Forming with Large Balls on...

Effect of Shot Peen Forming with Large Balls on Fatigue Resistance of 2024-T351 Aluminum Alloy

Abstract:

Shot peen forming different from shot peening is a metal forming process widely used in aeronautical industry. Different types of tension-tension fatigue specimens after peen forming were tested. The results show that the fatigue life of specimens peen formed with large balls except edges is 35.4% higher than that of unpeened specimens, while the life of the specimens with whole surface peen formed is 23.2% lower than that of the unpeened specimens. In addition, shot peening specimens which have been peen formed as a surface strengthening way can significantly improve the fatigue resistance. Moreover, when the specimen is peen formed except edges, the position of crack source is from the indentation region to subsurface.