Transmission electron microscopy of a CMSX-4 Ni-base superalloy produced by selective electron beam melting

Beitrag in einer Fachzeitschrift
(Originalarbeit)


Details zur Publikation

Autor(en): Parsa AB, Ramsperger M, Kostka A, Somsen C, Körner C, Eggeler G
Zeitschrift: Metals
Verlag: MDPI AG
Jahr der Veröffentlichung: 2016
Band: 6
Heftnummer: 11
ISSN: 2075-4701
Sprache: Englisch


Abstract


In this work, the microstructures of superalloy specimens produced using selective electron beam melting additive manufacturing were characterized. The materials were produced using a CMSX-4 powder. Two selective electron beam melting processing strategies, which result in higher and lower effective cooling rates, are described. Orientation imaging microscopy, scanning transmission electron microscopy and conventional high resolution transmission electron microscopy are used to investigate the microstructures. Our results suggest that selective electron beam melting processing results in near equilibrium microstructures, as far as γ′ volume fractions, the formation of small amounts of TCP phases and the partitioning behavior of the alloy elements are concerned. As expected, higher cooling rates result in smaller dendrite spacings, which are two orders of magnitude smaller than observed during conventional single crystal casting. During processing, columnar grains grow in <100> directions, which are rotated with respect to each other. There are coarse γ/γ′ microstructures in high angle boundary regions. Dislocation networks form low angle boundaries. A striking feature of the as processed selective electron beam melting specimens is their high dislocation density. From a fundamental point of view, this opens new possibilities for the investigation of elementary dislocation processes which accompany solidification.



FAU-Autoren / FAU-Herausgeber

Körner, Carolin Prof. Dr.-Ing.
Lehrstuhl für Werkstoffwissenschaften (Werkstoffkunde und Technologie der Metalle)
Ramsperger, Markus
Lehrstuhl für Werkstoffwissenschaften (Werkstoffkunde und Technologie der Metalle)


Autor(en) der externen Einrichtung(en)
Max-Planck-Institut für Eisenforschung GmbH (MPIE) / Max Planck Institute for Iron Research
Ruhr-Universität Bochum (RUB)


Zitierweisen

APA:
Parsa, A.B., Ramsperger, M., Kostka, A., Somsen, C., Körner, C., & Eggeler, G. (2016). Transmission electron microscopy of a CMSX-4 Ni-base superalloy produced by selective electron beam melting. Metals, 6(11). https://dx.doi.org/10.3390/met6110258

MLA:
Parsa, Alireza B., et al. "Transmission electron microscopy of a CMSX-4 Ni-base superalloy produced by selective electron beam melting." Metals 6.11 (2016).

BibTeX: 

Zuletzt aktualisiert 2018-22-11 um 13:50