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INCONEL 718: A solidification diagram

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Abstract

As part of a program studying weldability of Ni-base superalloys, results of an integrated analytical approach are used to generate a constitution diagram for INCONEL 718* in the temperature range associated with solidification. Differential thermal analysis of wrought material and optical and scanning electron microscopy, electron probe microanalysis, and analytical electron microscopy of gas tungsten arc welds are used in conjunction with solidification theory to generate data points for this diagram. The important features of the diagram are an austenite (γ)/Laves phase eutectic which occurs at ≈19.1 wt pct Nb between austenite containing ≈9.3 wt pct Nb and a Laves phase which contains ≈22.4 wt pct Nb. The distribution coefficient for Nb was found to be ≈0.5. The solidification sequence of INCONEL 718 was found to be (1) proeutectic γ, followed by (2) a γ/NbC eutectic at ≈1250°C, followed by (3) continued γ solidification, followed by (4) a γ/Laves phase eutectic at ≈1200°C. An estimate of the volume fraction eutectic is made using the Scheil solidification model, and the fraction of each phase in the eutectic is calculatedvia the lever rule. These are compared with experimentally determined values and found to be in good agreement.

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Authors and Affiliations

  1. Sandia National Laboratories, 87185, Albuquerque, NM

    G. A. Knorovsky (Member of Technical Staff), M. J. Cieslak (Member of Technical Staff), T. J. Headley (Member of Technical Staff), A. D. Romig (Division Supervisor) & W. F. Hammetter (Member of Technical Staff)

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  1. G. A. Knorovsky
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  2. M. J. Cieslak
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  3. T. J. Headley
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  4. A. D. Romig
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  5. W. F. Hammetter
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Knorovsky, G.A., Cieslak, M.J., Headley, T.J. et al. INCONEL 718: A solidification diagram. Metall Trans A 20, 2149–2158 (1989). https://doi.org/10.1007/BF02650300

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  • DOI: https://doi.org/10.1007/BF02650300

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