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Effects of Re and Ru on the Solidification Characteristics of Nickel-Base Single-Crystal Superalloys

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Abstract

The solidification characteristics, such as the phase transformation temperature and partition coefficient, were investigated in four Ni-base single-crystal superalloys with varied contents of Re and Ru. Differential scanning calorimetry (DSC) analysis reveals that the liquidus and solidus temperatures decrease with increasing levels of Re additions. However, the Ru only has negligible influences on the liquidus and solidus temperatures. The partition coefficient of constituent elements is investigated by using the directional solidification followed quenching (DSQ) technique. Re is found to reduce the segregation of Re and W, whereas Ru only has negligible effects on the segregation of Re and W. For comparison, the matrix scanning is performed on the representative dendritic structures. With increasing withdrawal rate, Re and Ru additions show the stronger influences on segregation behavior of alloying elements, particularly for Al and Ta.

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Acknowledgments

The authors gratefully acknowledge the financial support from the National Natural Science Foundation of China (Grant Nos. 50931004, 50827102, and 50771081), National Basic Research Program of China (Grant Nos. 2010CB631202 and 2011CB610406), National High Technology Research and Development Program (Grant No. 2007AA03Z552), and the fund of the State Key Laboratory of Solidification Processing in NWPU.

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Correspondence to Lin Liu.

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Manuscript submitted October 20, 2010.

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Liu, G., Liu, L., Zhao, X. et al. Effects of Re and Ru on the Solidification Characteristics of Nickel-Base Single-Crystal Superalloys. Metall Mater Trans A 42, 2733–2741 (2011). https://doi.org/10.1007/s11661-011-0673-4

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