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
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