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The Effect of Cooling Rate from Solution on the Lattice Misfit During Isothermal Aging of a Ni-Base Superalloy

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Abstract

The evolution of lattice misfit in the polycrystalline nickel-base superalloy, RR1000, has been investigated using high resolution neutron diffraction at interrupted time intervals during an aging heat treatment. Samples were subjected to a super-solvus heat treatment followed by either a 100 or a 1 K min−1 cooling rate prior to aging. Irrespective of cooling rate, the lattice misfit remained unchanged at approximately 0.1 pct throughout the aging cycle, indicating the microstructure remained stable. Microstructural observations validated this result for samples cooled at 1 K min−1. However, for the faster, 100 K min−1, cooling rate, whilst the secondary γ′ remained unchanged, the tertiary γ′ showed significant coarsening. Simulated diffraction patterns were used to investigate the influence of volume fraction, particle size, and lattice parameter of individual γ′ distributions on the measured lattice misfit. The results obtained indicate that conventional methods of measuring lattice misfit will be dominated by the γ′ distribution with the highest volume fraction, and may therefore obscure subtle changes in the γ′ distributions with lower a volume fraction.

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Acknowledgments

Financial support from the EPSRC and Rolls-Royce plc. is acknowledged (DMC supported by a DTA studentship, HJS supported by the Rolls-Royce EPSRC Strategic Partnership—EP/H500375/1). The authors are grateful to M.C. Hardy and R.J. Mitchell (Rolls-Royce plc.) for their technical support during this work. The authors are additionally grateful for the allocation of experimental time on the HRPD instrument at the ISIS neutron spallation source (RB610489) and the technical support by R.M. Ibberson.

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Authors and Affiliations

  1. Diamond Light Source, Harwell Science and Innovation Campus, Didcot, Oxfordshire, OX11 0DE, U.K.

    L. D. Connor (Industrial Research Scientist)

  2. Rolls-Royce UTC, Department of Materials Science & Metallurgy, University of Cambridge, 27 Charles Babbage Road, Cambridge, CB3 0FS, U.K.

    H. J. Stone (Assistant Director of Research) & C. M. F. Rae (Reader in Physical Metallurgy)

  3. Department of Materials, University of Oxford, Parks Road, Oxford, OX3 0AZ, U.K.

    D. M. Collins (Postdoctoral Researcher)

  4. School of Materials, The University of Manchester, Manchester, M13 9PL, U.K.

    M. Preuss (Professor of Metallurgy)

  5. Rolls-Royce plc., P.O. Box 31, Derby, DE24 8BJ, U.K.

    M. C. Hardy (Corporate Specialist—Nickel Alloys)

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  1. L. D. Connor
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  2. H. J. Stone
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  3. D. M. Collins
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  4. M. Preuss
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  5. M. C. Hardy
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  6. C. M. F. Rae
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Corresponding author

Correspondence to L. D. Connor.

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Manuscript submitted July 17, 2013.

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Connor, L.D., Stone, H.J., Collins, D.M. et al. The Effect of Cooling Rate from Solution on the Lattice Misfit During Isothermal Aging of a Ni-Base Superalloy. Metall Mater Trans A 45, 2436–2444 (2014). https://doi.org/10.1007/s11661-014-2197-1

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