Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 528, Issue 10-11, Pages 3823-3828Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2011.01.077
Keywords
7050-T7451 aluminum alloy; Laser-peening; Shot-peening; Residual stresses; Fatigue
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The fatigue strength for 1 x 10(7) cycles of 7050-T7451 aluminum alloy was determined for machined, laser-peened, and shot-peened specimens. Moreover, fatigue lives were compared under the same load conditions. Results show that the laser peening induces a deeper compressive residual stress layer and better surface finish, therefore, it improves fatigue properties more effectively. Fractographic examination and analysis shows that the fatigue cracks initiate in the subsurface layer beneath the compressive residual stress field for laser- and shot-peened specimens, whereas the fatigue cracks form at surface for as-machined ones. (C) 2011 Elsevier B.V. All rights reserved.
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