Open Access

ARTICLE

Experimental Study of Shot Peening Followed by Cold Spray Coating on Residual Stresses of the Treated Parts

R. Ghelichi¹, S. Bagherifard¹, I. Fernandez Parienete², M.Guagliano^1,3, Simone Vezzù⁴

1 Department of Mechanical Eng., Politecnico di Milano, Via La Masa 34, 20156 Milan, Italy.
2 Department of Material Science and Metallurgical Eng., University of Oviedo, Gijón, Spain.
3 Corresponding author. E-mail: mario.guagliano@polimi.it; Tel.: 02.2399.8206; Fax.: 02.2399.8202.
4 Associazione Civen, Marghera, Italy.

Structural Durability & Health Monitoring 2010, 6(1), 17-30. https://doi.org/10.3970/sdhm.2010.006.017

Abstract

Coating deposition processes such as cold spraying are commonly employed to increase wear and fatigue resistance and consequently to enhance longevity of engineering components. Such processes typically introduce residual stresses into the coated surface, which in turn affect efficiency of coatings and play an important role in coating durability. In fact residual stresses are the key parameter to obtain compact and well-adherent coatings. They can modify several coating properties such as adhesion, structure, toughness, hardness reflecting on the macroscopic chemical and mechanical behavior of the coating.
Present study describes alteration of residual stress state of two types of aluminum coatings that are cold sprayed onto aluminum substrate, and subsequently treated by air blast shot peening (ABSP). Residual stress measurements have been made by means of X-ray diffractometer (XRD) on coated specimens both before and after shot peening process. The results indicate that residual stresses generated during coating process have been modified by the successive shot peening process.

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