Investigations of γ′, γ″ and δ precipitates in heat-treated Inconel 718 alloy fabricated by selective laser melting
By G. Cao, T. Sun, C. H. Wang, Xing Li, Minmin Liu, Z. X. Zhang, P. Hu, A. Russell, R. Schneider, D. Gerthsen and 3 more. 2018
230 citations recorded by the source corpus.
Abstract 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.
Subfields: Automotive Engineering, Mechanical Engineering
View Paper: https://www.semanticscholar.org/paper/b83be4d13317d7612653524b54f6525e3fae6a01
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Citations in the corpus
- Laser additive manufacturing of nano-TiC reinforced Ni-based nanocomposites with tailored microstructure and performance (2019, background): “Among them, Inconel 718 is a precipitation-strengthened Ni-Cr-Fe superalloy, and characterized by an improved balance of high strength, creep performance, tensile property, as well as corrosion and oxidation resistances at elevated temperatures up to 700 °C, which makes it attractive in gas turbines”
- Knowledge of process-structure-property relationships to engineer better heat treatments for laser powder bed fusion additive manufactured Inconel 718 (2019, result): “Contrary to previous reports [87], coprecipitates are present in AM-IN718 after aging, be it direct aging or aging of solutionized materials (Table 4).”