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3748 |
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Influence of cold spray deposition on the fatigue strength of A6082 alloy |
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Simone Vezzù* / Veneto Nanotech , ITALY Silvano Rech/ Veneto Nanotech, Italy Enrico Vedelago/ Veneto Nanotech, Italy Mario Guagliano/ Politecnico di Milano, Italy Atieh Moridi/ Politecnico di Milano, Italy Seyyed Mostafa Hassani/ Politecnico di Milano, Italy |
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The use of Cold Spray for depositing aluminum and aluminum alloy coatings is becoming a consolidated procedure both for protection and MRO (Maintenance Repair and Overhaul) applications in aviation, automotive and mechanic industry. For this purposes, despite the key role of fatigue strength in materials and coating design there are only a few references where these mechanical properties are evaluated on cold spray coated surfaces. The aim of this study is to investigate the effect of a 100 mm A6082 alloy coatings deposited by using a Kinetic 4000 high pressure Cold Spray system on fatigue strength of A6082 base material. The effect of deposition strategy as well the influence of preliminary or post-deposition treatments by shot peening and severe shot peening have been also investigated in order to further enhance the fatigue resistance. Rotating bending fatigue limit of the cold sprayed specimens was experimentally determined and compared with the as-received specimens. Residual stress profiles obtained by XRD combined with electropolishing and observation of fractured surfaces were performed to study and discuss the failure mechanisms of the cold-sprayed materials. The characterization plan has been completed by the investigation of the coating microstructure by scanning electron microscopy and the determination of coating adhesion (substrate A6082) and cohesion following the consolidated ASTM-C633 and TCT tests. |