Additive manufacturing of nickel-based superalloy Inconel 718 by selective electron beam melting: Processing window and microstructure

Beitrag in einer Fachzeitschrift
(Originalarbeit)


Details zur Publikation

Autor(en): Helmer HE, Körner C, Singer R
Zeitschrift: Journal of Materials Research
Verlag: Cambridge University Press
Jahr der Veröffentlichung: 2014
Band: 29
Heftnummer: 17
Seitenbereich: 1987-1996
ISSN: 2044-5326
Sprache: Englisch


Abstract


Cube-shaped IN718 samples were produced by selective electron beam melting (SEBM) with varying beam power, deflection speed, and beam spot size. Process parameter windows were identified where fully dense samples are obtained with no surface unevenness. High deflection speeds were demonstrated to result in smaller demand of area energy. This result is explained by the reduced time for heat dissipation into the substrate during hatching. The grain structure was strongly affected by SEBM process parameters. Under certain conditions, epitaxial growth over many layers and well-developed columnar grain structures were obtained with a polycrystalline substrate plate. A more defocused beam led to a lower melt pool temperature and shallower melt pool geometry where maximum temperature gradients and solidification rates were more or less in parallel with the building direction and primary dendrite arm orientation. These conditions help to suppress grain nucleation ahead of the nucleation front as vigorous melt movement, fragmentation of dendrites, and tertiary arm growth are suppressed.



FAU-Autoren / FAU-Herausgeber

Helmer, Harald Ernst
Technische Fakultät
Körner, Carolin Prof. Dr.-Ing.
Lehrstuhl für Werkstoffwissenschaften (Werkstoffkunde und Technologie der Metalle)
Singer, Robert Prof. Dr.-Ing.
Lehrstuhl für Werkstoffwissenschaften (Werkstoffkunde und Technologie der Metalle)


Zitierweisen

APA:
Helmer, H.E., Körner, C., & Singer, R. (2014). Additive manufacturing of nickel-based superalloy Inconel 718 by selective electron beam melting: Processing window and microstructure. Journal of Materials Research, 29(17), 1987-1996. https://dx.doi.org/10.1557/jmr.2014.192

MLA:
Helmer, Harald Ernst, Carolin Körner, and Robert Singer. "Additive manufacturing of nickel-based superalloy Inconel 718 by selective electron beam melting: Processing window and microstructure." Journal of Materials Research 29.17 (2014): 1987-1996.

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