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

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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.

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Acknowledgments

The work reported here was carried out with support from the Korean Ministry of Knowledge Economy. One of the authors (SMS) greatly acknowledges the Japan Society for the Promotion of Science (JSPS) and the Korea Science and Engineering Foundation (KOSEF) for the financial support through the Ronpaku fellowship. SMS also thanks Mr. Ichinose, Mitsubishi Heavy Industries Gas Turbine Service, for his kind assistance with the EPMA works.

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Authors and Affiliations

  1. High Temperature Materials Group, Korea Institute of Materials Science, Changwon, 641-010, South Korea

    S. M. Seo (Senior Researcher), Y. S. Yoo (Principal Researcher) & C. Y. Jo (Principal Researcher)

  2. Department of Metallurgy and Materials Engineering, Changwon University, Changwon, 641-773, South Korea

    J. H. Lee (Professor)

  3. Department of Materials Science and Engineering, Kyushu University, Fukuoka, 819-0395, Japan

    H. Miyahara (Associate Professor)

  4. Oita National College of Technology, Oita, 870-0152, Japan

    K. Ogi (Professor)

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  1. S. M. Seo
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  2. J. H. Lee
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  3. Y. S. Yoo
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  4. C. Y. Jo
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  5. H. Miyahara
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  6. K. Ogi
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Correspondence to S. M. Seo.

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Manuscript submitted April 11, 2010.

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Seo, S.M., Lee, J.H., Yoo, Y.S. et al. A Comparative Study of the γ/γ′ Eutectic Evolution During the Solidification of Ni-Base Superalloys. Metall Mater Trans A 42, 3150–3159 (2011). https://doi.org/10.1007/s11661-011-0738-4

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  • DOI: https://doi.org/10.1007/s11661-011-0738-4

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