Cold spray forming of Inconel 718

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Journal titleJournal of Thermal Spray Technology
Pages413421; # of pages: 9
Subjectcoatings for engine components; cold spray; cold gas dynamic spraying; Inconel; mechanical properties; spray forming
AbstractInconel 718 was cold spray formed to a 6-mm thickness on an 8-cm diameter aluminum alloy tube using Sulzer Amdry 1718 powder and the Plasma Giken PCS-1000 cold spray system. The effects of spray particle velocity and post-spray heat treatment were studied. Post-spray annealing was performed from 950 to 1250ºC for 1-2 h. The resulting microstructures as well as the corresponding mechanical properties were characterized. As-sprayed coatings exhibited very low ductility. The tensile strength and ductility of the heat-treated coatings were improved to varying levels depending on the heat-treatment and spray conditions. For coatings sprayed at higher particle velocity and heat treated at 1250ºC for 1 h, an elongation of 24% was obtained. SEM micrographs showed a higher fraction of interparticle metallurgical bonds due to some sintering effect. Corresponding fracture surfaces also revealed a higher fraction of dimple features, typically associated with ductile fracture, in the annealed coatings. The results demonstrate that cold spray forming of Inconel 718 is feasible, and with appropriate heat treatment, metallurgical bonding can be increased. The ductility of the spray-formed samples was comparable to that of the bulk material.
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AffiliationNational Research Council Canada; Automotive
Peer reviewedYes
NPARC number21268109
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Record identifierbb38c60f-1b20-445a-9f2d-095c07788298
Record created2013-04-11
Record modified2016-05-09
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