THE EFFECT OF SHOT PEENING ON TRIBO-CORROSION CHARACTERISTICS OF ADDITIVELY MANUFACTURED Ti-6Al-4V USED IN THE MARINE INDUSTRY

Author:  K.A. Vellaa, J. Buhagiara, G. Cassara, L. Bonnicia, M.M. Pizzutoa, J. Chenb, X.Y. Zhangb, M.Y. Liub, Z.Q. Huangb, A. Zammita a Department of Metallurgy and Materials Engineering, University of Malta, Msida, Malta – ann.zammit@um.edu.mt b School of Materia
Source:  ICSP14 Milan
Doc ID:  2022103
Year of Publication:  2022
Abstract:  
Abstract Ti-6Al-4V is a long-established titanium alloy, however, its use is often limited by its poor behaviour under friction conditions. Such behaviour is more pronounced in environments where corrosion occurs in conjunction with wear. This limitation can be mitigated through surface engineering techniques. In this investigation, the titanium substrates, manufactured via selective laser melting, were subjected to a shot peening treatment. The effect of the surface treatment on the microstructure, microhardness and roughness of the samples was studied via a number of characterisation techniques. To provide an insight into the corrosionwear response, the samples were tested under reciprocating sliding wear conditions at an anodic potential in simulated ocean water. The shot-peened samples exhibited no improvement in the corrosion-wear resistance when compared to the untreated printed samples. Tribocorrosion calculations suggest degradation occurred due to mechanical wear with a marginal contribution from corrosion. Keywords additive manufacturing, shot peening, tribocorrosion, hardness, roughness