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Metallurgical and Materials Transactions A
Erschienen in: Metallurgical and Materials Transactions A 10/2011

01.10.2011

A Comparative Study of the γ/γ′ Eutectic Evolution During the Solidification of Ni-Base Superalloys

verfasst von: S. M. Seo, J. H. Lee, Y. S. Yoo, C. Y. Jo, H. Miyahara, K. Ogi

Erschienen in: Metallurgical and Materials Transactions A | Ausgabe 10/2011

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Abstract

The evolution of γ/γ′ eutectic during the solidification of Ni-base superalloys CMSX-10 and CMSX-4 was investigated over a wide range of cooling rates. The microsegregation behavior during solidification was also quantitatively examined to clarify the influence of elemental segregation on the evolution of γ/γ′ eutectic. In the cooling rate ranges investigated (0.9 to 138.4 K/min (0.9 to 138.4 °C/min)), the γ/γ′ eutectic fraction in CMSX-10 was found to be more than 2 times higher than that in CMSX-4 at a given cooling rate. However, the dependence of the γ/γ′ eutectic fraction on the cooling rate in both alloys showed a similar tendency; i.e., the γ/γ′ eutectic fraction increased with increasing the cooling rate and then exhibited a maximum plateau at and above the certain critical cooling rate in both alloys. This critical cooling rate was found to be dependent on the alloy composition and was estimated to be about 12 K/min (12 °C/min) and 25 K/min (25 °C/min) for CMSX-10 and CMSX-4, respectively. The calculated solid compositions based on the modified Scheil model revealed that even a small compositional difference of total γ′ forming elements in the initial composition of the alloy can play a significant role in the as-cast eutectic fraction during the solidification of Ni-base superalloys. The evolution of the γ/γ′ eutectic fraction with respect to the cooling rate could be rationalized by taking into account the effects of back-diffusion in solid and dendrite arm coarsening on decreasing the extent of microsegregation.
Vorheriger Artikel Influence of Intensive Melt Shearing on the Microstructure and Mechanical Properties of an Al-Mg Alloy with High Added Impurity Content
Nächster Artikel Localized Recrystallization in Cast Al-Si-Mg Alloy during Solution Heat Treatment: Dilatometric and Calorimetric Studies

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Metadaten
Titel
A Comparative Study of the γ/γ′ Eutectic Evolution During the Solidification of Ni-Base Superalloys
verfasst von
S. M. Seo
J. H. Lee
Y. S. Yoo
C. Y. Jo
H. Miyahara
K. Ogi
Publikationsdatum
01.10.2011
Verlag
Springer US
Erschienen in
Metallurgical and Materials Transactions A / Ausgabe 10/2011
Print ISSN: 1073-5623
Elektronische ISSN: 1543-1940
DOI
https://doi.org/10.1007/s11661-011-0738-4

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