Tertiary dendritic instability in late stage solidification of Ni-based superalloys

Beitrag in einer Fachzeitschrift


Details zur Publikation

Autor(en): Franke M, Singer R, Steinbach I
Zeitschrift: Modelling and Simulation in Materials Science and Engineering
Verlag: IOP PUBLISHING LTD
Jahr der Veröffentlichung: 2014
Band: 22
Heftnummer: 2
ISSN: 0965-0393
Sprache: Englisch


Abstract


Derivatives of the commercial alloy CMSX-4 were directionally solidified and characterized with respect to their final dendrite microstructure. The results indicate that Ni-based superalloys with high segregation levels show significant instability in secondary dendrite arms and an increased tendency for tertiary arm formation, respectively. Phase-field simulations were used to explore the impact of chemical composition on morphological instability and tertiary arm formation during the directional solidification of Ni-based superalloys. It is found that an increase in specific alloying elements in the overall alloy composition leads to pronounced segregation at the end of solidification. This causes strong growth restriction of the secondary arms and triggers tertiary arm formation. The proposed mechanism explains experimental microstructures found in modifications of the base alloy CMSX-4.



FAU-Autoren / FAU-Herausgeber

Franke, Martin
Lehrstuhl für Werkstoffwissenschaften (Werkstoffkunde und Technologie der Metalle)
Singer, Robert Prof. Dr.-Ing.
Lehrstuhl für Werkstoffwissenschaften (Werkstoffkunde und Technologie der Metalle)


Autor(en) der externen Einrichtung(en)
Ruhr-Universität Bochum (RUB)


Zitierweisen

APA:
Franke, M., Singer, R., & Steinbach, I. (2014). Tertiary dendritic instability in late stage solidification of Ni-based superalloys. Modelling and Simulation in Materials Science and Engineering, 22(2). https://dx.doi.org/10.1088/0965-0393/22/2/025026

MLA:
Franke, Martin, Robert Singer, and Ingo Steinbach. "Tertiary dendritic instability in late stage solidification of Ni-based superalloys." Modelling and Simulation in Materials Science and Engineering 22.2 (2014).

BibTeX: 

Zuletzt aktualisiert 2018-16-07 um 15:23