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Precipitation of the δ-Ni3Nb phase in two nickel base superalloys

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Abstract

The precipitation of the equilibrium δ-Ni3Nb phase has been studied in two niobium bearing nickel base superalloys—INCONEL 718 and INCONEL* 625—both of which are hardenable by the precipitation of the metastableγ″-Ni3Nb phase. The morphology and the distribution of precipitates have been examined and the crystallographic orientation relationship between the austenite and theδ phases has been determined. The nucleation of theδ phase at stacking faults within pre-existing δ" precipitates has been discussed.

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Authors and Affiliations

  1. Physical Metallurgy Division, Bhabha Atomic Research Centre, 400 085, Bombay, India

    M. Sundararaman (Scientific Officer), P. Mukhopadhyay (Scientific Officer) & S. Banerjee (Scientific Officer)

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  1. M. Sundararaman
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  2. P. Mukhopadhyay
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  3. S. Banerjee
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Sundararaman, M., Mukhopadhyay, P. & Banerjee, S. Precipitation of the δ-Ni3Nb phase in two nickel base superalloys. Metall Trans A 19, 453–465 (1988). https://doi.org/10.1007/BF02649259

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  • DOI: https://doi.org/10.1007/BF02649259

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