Materials Science and Engineering, Ames Laboratory
Journal or Book Title
Inconel 718 alloy samples were fabricated by selective laser melting (SLM). Microstructure and precipitation in solution-heat-treated- and double-aging-SLM-made Inconel 718 were studied by scanning and transmission electron microscopy. Electron microscope observations showed that disc-shaped and cuboidal γ″, and circular γ′ precipitates with an average size of 10–50 nm developed within cellular γ austenite matrix. The simulated, experimentally observed electron diffraction patterns, and dark-field imaging further revealed that the precipitation of three variants of γ″ in the γ matrix occurred. The coarser acicular γ″, and globular as well as plate-like δ phases precipitated at grain boundaries and also within the interior of austenite matrix. The morphology, distribution and crystallography of these precipitates and their formation mechanisms were analyzed and discussed.
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Cao, G. H.; Sun, T. Y.; Wang, C. H.; Li, Xing; Liu, M.; Zhang, Z. X.; Hu, P. F.; Russell, Alan M.; Schneider, R.; Gerthsen, D.; Zhou, Z. J.; Li, C. P.; and Chen, G. F., "Investigations of γ′, γ″ and δ precipitates in heat-treated Inconel 718 alloy fabricated by selective laser melting" (2018). Materials Science and Engineering Publications. 313.