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Effect of aluminum addition on the precipitation behavior of a Co-Ni-Cr base superalloy containing Nb

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Abstract

The effect of Al addition on a new Co-Ni-Cr base superalloy containing Nb are discussed. The main strengthening phase was found to be γ′ which grows by Lifshitz-Wagner theory of diffusion controlled growth. On prolonged aging, γ′ loses its coherency with the matrix but maintains its ordered FCC structure. Carbon, present as an impurity element, gave rise to NbC phase which precipitates at the grain boundary as well as within the grains. Occasionally sigma phase was also observed in the overaged specimens. An attempt has also been made to analyze the structure of the precipitates on the electronic consideration of Engel-Brewer theory.

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Authors and Affiliations

  1. Metallurgical Science Laboratory Faculty of Engineering, University of Manitoba, R3T 2N2, Winnipeg, Canada

    C. Ravindran (Graduate student) & M. C. Chaturvedi (Associate Professor)

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  1. C. Ravindran
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  2. M. C. Chaturvedi
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Ravindran, C., Chaturvedi, M.C. Effect of aluminum addition on the precipitation behavior of a Co-Ni-Cr base superalloy containing Nb. Metall Trans A 6, 213–217 (1975). https://doi.org/10.1007/BF02673690

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