Tertiary dendritic instability in late stage solidification of Ni-based superalloys
Franke M, Singer R, Steinbach I (2014)
Publication Language: English
Publication Status: Published
Publication Type: Journal article
Publication year: 2014
Journal
Publisher: IOP PUBLISHING LTD
Book Volume: 22
Journal Issue: 2
DOI: 10.1088/0965-0393/22/2/025026
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.
Authors with CRIS profile
Martin Franke
Lehrstuhl für Werkstoffwissenschaften (Werkstoffkunde und Technologie der Metalle)
Robert Singer
Lehrstuhl für Werkstoffwissenschaften (Werkstoffkunde und Technologie der Metalle)
Involved external institutions
Germany (DE)How to cite
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).
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