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Microstructure Evolution during Supersolvus Heat Treatment of a Powder Metallurgy Nickel-Base Superalloy

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Abstract

Microstructure evolution during the supersolvus heat treatment of a powder-metallurgy, low-solvus, high-refractory (LSHR) superalloy was established. For this purpose, three lots of LSHR with varying initial carbon/boron composition and thermomechanical history were subjected to a series of short-time (induction) and long-time (furnace) heat treatments followed by scanning electron microscopy/electron backscatter diffraction and quantitative metallography. The size of the (pinned) gamma grains exhibited a limited dependence on heating rate and soak time at peak temperature, and it was generally smaller than the predictions based on the classic Smith-Zener model. The differences were rationalized in terms of stereological and pinning-particle location effects. Observations of limited coarsening of the carbide/boride pinning particles were interpreted in the context of prior experimental observations and a modified Lifshitz-Slyosov-Wagner model applied previously for the coarsening of compound phases in steels.

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Notes

  1. The shape factor σ for a lognormal distribution is related to the ratio of the standard deviation sx and the mean \( < s > \) of the distribution by the relation \( {\text{s}_{x}}/ < s > = \sqrt {\mathop e\nolimits^{{\sigma^{2} }} - 1} \).

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Acknowledgments

This work was conducted as part of the in-house research of the Metals Branch of the Air Force Research Laboratory’s Materials and Manufacturing Directorate. The support and encouragement of the Laboratory management are gratefully acknowledged. The assistance of P.N. Fagin and T.M. Brown in conducting the experiments is appreciated. Technical discussions with J. Gayda and J. Telesman (NASA GRC) are also much appreciated. Two authors (A.D.R. and C.G.R.) also acknowledge support from the Air Force STW-21 Initiative, Contract F33615-01-2-5225, and the MRSEC at Carnegie Mellon University, NSF Grant Number DMR-0520425.

Author information

Author notes

  1. K. E. McClary (Undergraduate Student, Design Engineer)

    Present address: The Hall Company, Urbana, OH, 43078, USA

  2. E. J. Payton (Postdoctoral Researcher, Adolf Martens Postdoctoral Fellow)

    Present address: Federal Institute for Materials Research and Testing (BAM), Unter den Eichen 87, 12205, Berlin, Germany

Authors and Affiliations

  1. Air Force Research Laboratory, Materials and Manufacturing Directorate, AFRL/RXLM, Wright-Patterson Air Force Base, Dayton, OH, 45433, USA

    S. L. Semiatin (Senior Scientist, Materials Processing/Processing Science)

  2. Physics Department, Wright-State University, Dayton, OH, 45435, USA

    K. E. McClary (Undergraduate Student, Design Engineer)

  3. Department of Materials Science and Engineering, Carnegie Mellon University, Pittsburgh, PA, 15213, USA

    A. D. Rollett (Professor)

  4. Vallourec and Mannesmann USA Corporation, Youngstown, OH, 44510, USA

    C. G. Roberts (Process Engineer)

  5. Institut für Werkstoffe, Ruhr-Universität Bochum, Bochum, Germany

    E. J. Payton (Postdoctoral Researcher, Adolf Martens Postdoctoral Fellow)

  6. Computherm LLC, Madison, WI, 53719, USA

    F. Zhang (President)

  7. NASA Glenn Research Center, Cleveland, OH, 44135, USA

    T. P. Gabb (Metallurgist)

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  1. S. L. Semiatin
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Corresponding author

Correspondence to S. L. Semiatin.

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Manuscript submitted July 5, 2011.

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Semiatin, S.L., McClary, K.E., Rollett, A.D. et al. Microstructure Evolution during Supersolvus Heat Treatment of a Powder Metallurgy Nickel-Base Superalloy. Metall Mater Trans A 43, 1649–1661 (2012). https://doi.org/10.1007/s11661-011-1035-y

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