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• W3174928974 endingPage "117133" @default.
• W3174928974 startingPage "117133" @default.
• W3174928974 abstract "Additive manufacturing technologies have emerged as potentially disruptive processes whose possible impacts range across supply chain logistics, prototyping, and novel materials synthesis. Numerous works illustrate the ability to control microstructure in fusion based processes and a few recent authors have even produced single crystals. However, a number of questions remain open regarding the process window which enables printing of single crystals. Furthermore, it has been observed that these additively manufactured single crystals exhibit a preferred 〈011〉 secondary orientation parallel to the scanning direction. In this work we investigate the fabrication conditions that enable printing of single crystals via electron beam melting. A space filling design of experiments is utilized to efficiently explore the fabrication space. Single crystals are successfully obtained using both commercially available powders and custom melt alloys. Microstructures obtained via these exploratory experiments exhibited a continuum of columnar structures ranging from weakly textured polycrystals, near single crystal, and fully single crystalline material. Complex geometry experiments are performed to study the grain selection mechanism. We find that the grain selection mechanism is independent of the bulk scale geometry and must therefore be driven by local heat transfer and solidification dynamics. Furthermore, grain selection is shown to be driven by competing driving forces; one which prefers epitaxial growth and another which is driven by the imposed processing conditions." @default.
• W3174928974 created "2021-07-05" @default.
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• W3174928974 date "2021-09-01" @default.
• W3174928974 modified "2023-10-17" @default.
• W3174928974 title "Nickel-based superalloy single crystals fabricated via electron beam melting" @default.
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• W3174928974 doi "https://doi.org/10.1016/j.actamat.2021.117133" @default.
• W3174928974 hasPublicationYear "2021" @default.
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