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Cold spray forming Inconel 718
; Wong, W.
; Irissou, É.
; Legoux, J.-G.
; Bernier, F.
; Vo, P.
; Yue, S.
; Michiyoshi, S.
International Thermal Spray 2012 Conference and Exposition (ITSC 2012), 21-24 May 2012, Houston, Texas, USA
Thermal Spray 2012 : Proceedings from the International Spray Conference and Exposition
In this investigation, Inconel 718, a material known to cause nozzle clogging upon cold spraying, was cold spray formed to 6 mm-thick using the Plasma Giken cold spray system PCS- 1000. This was made possible due to the novel non-clogging nozzle material combined with a nozzle water cooling system. Coatings were as-spray formed using both nitrogen and helium as the propelling gasses. The resulting microstructures as well as the corresponding mechanical properties were studied. In addition, the effect of post-heat treatments was also investigated. It was found that for a given propelling gas used, the coating porosity level remained relatively similar (about 2.4% for nitrogen and 3.6% for helium) regardless of the coating treatment (as-sprayed or heat treated). Visual inspection from SEM micrographs showed a higher fraction of inter-particle metallurgical bonds for nitrogen gas sprayed coatings heat treated at 1250°C for 1 hour due to some sintering effect. This significantly affected its tensile properties with an average resulting ductility of 24.7%.