Abstract
As a new member of the additive manufacturing family, cold spray provides various benefits such as a limited oxidation during deposition. Titanium alloys, being oxidation-sensitive materials, could thus benefit from this processing route. However, the high strength of these alloys implies that dense deposition is a significant challenge. Two pathways were explored to reduce porosity. The sensitivity to the different deposition parameters was first investigated. Further improvements were then obtained using in situ shot peening. Another major issue regarding the material performance is the presence of residual stresses. Usually, cold spray induces compressive residual stresses in the resulting deposits because of the shot peening effect of the solid-state particles. In contrast, the prevailing stresses are in tension in cold sprayed Ti-6Al-4V. An improved understanding of this feature, which stems from the contribution of different physical phenomena to the final stress state, would provide insights into a reduction of residual stress. This is crucial to maintain structural integrity and, in turn, consider cold spray as a viable additive manufacturing process. The in situ coating properties device allowed to measure the evolution of the residual stresses during and after deposition and to identify most influent operating parameters. The purpose of this study is to provide guidelines to control porosity and residual stresses in order to produce dense and thick Ti-6Al-4V coatings with good structural integrity.
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Acknowledgments
Pprime Institute gratefully acknowledges “Contrat de Plan Etat – Région Nouvelle-Aquitaine” (CPER) as well as the “Fonds Européen de Développement Régional” (FEDER) for their financial support to the reported work.
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Lett, S., Quet, A., Hémery, S. et al. Residual Stresses Development during Cold Spraying of Ti-6Al-4V Combined with In Situ Shot Peening. J Therm Spray Tech 32, 1018–1032 (2023). https://doi.org/10.1007/s11666-022-01514-w
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DOI: https://doi.org/10.1007/s11666-022-01514-w