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Mechanical Performance of Cold-Sprayed A357 Aluminum Alloy Coatings for Repair and Additive Manufacturing

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Abstract

Cold-sprayed coatings made of A357 aluminum alloy, a casting alloy widely used in aerospace, underwent set of standard tests as well as newly developed fatigue test to gain an information about potential of cold spray for repair and additive manufacturing of loaded parts. With optimal spray parameters, coating deposition on substrate with smooth surface resulted in relatively good bonding, which can be further improved by application of grit blasting on substrate’s surface. However, no enhancement of adhesion was obtained for shot-peened surface. Process temperature, which was set either to 450 or 550 °C, was shown to have an effect on adhesion and cohesion strength, but it does not influence residual stress in the coating. To assess cold spray perspectives for additive manufacturing, flat tensile specimens were machined from coating and tested in as-sprayed and heat-treated (solution treatment and aging) condition. Tensile properties of the coating after the treatment correspond to properties of the cast A357-T61 aluminum alloy. Finally, fatigue specimen was proposed to test overall performance of the coating and coating’s fatigue limit is compared to the results obtained on cast A357-T61 aluminum alloy.

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Acknowledgments

The research leading to these results has received funding from the European Union Seventh Framework Programme (FP7/2007-2013) under Grant Agreement No ACS3-GA-2013-605207-CORSAIR. We would like thank Peenservice srl (Bologna, Italy) for performing the shot peening treatment and group of P. Poza (URJC, Madrid, Spain) for providing us with micrographs displayed in Fig. 1.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Politecnico di Milano, Via G. La Masa, 1, 20156, Milan, Italy

    K. Petráčková & M. Guagliano

  2. Impact Innovations GmbH, Bürgermeister-Steinberger-Ring 1, 84431, Haun, Rattenkirchen, Germany

    J. Kondás

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  1. K. Petráčková
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  3. M. Guagliano
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Correspondence to K. Petráčková.

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Petráčková, K., Kondás, J. & Guagliano, M. Mechanical Performance of Cold-Sprayed A357 Aluminum Alloy Coatings for Repair and Additive Manufacturing. J Therm Spray Tech 26, 1888–1897 (2017). https://doi.org/10.1007/s11666-017-0643-5

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  • DOI: https://doi.org/10.1007/s11666-017-0643-5

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