Abstract
Abstract This investigation reports a processing strategy to develop a single crystal deposit via laser metal deposition. A single wall has been deposited with Rene 108 on a PWA 1484 single crystal substrate. This was performed by effectively controlling the process-parameters and heat flow direction during solidification. The as-deposited sample unveiled a single grain throughout the volume. Microstructural investigation of the as-deposited sample revealed the existence of spherical γ′ with an average size of 46 nm in the dendrite core with eutectic phases of γ/γ′/MC along the inter-dendrite boundaries. Heat treatment executed on the sample revealed a trimodal distribution of γ′ precipitates with an average size of 271 nm cuboidal, 58 nm spherical γ′, and rafted (interconnected ‘cuboidal’) γ′. The XRD investigation on the sample confirms the presence of a single grain throughout the volume and reveals a lattice parameter of 358.3 pm in the as-deposited condition and 358.05 pm in the heat-treated condition.
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