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Homogenizing a Nickel-Based Superalloy: Thermodynamic and Kinetic Simulation and Experimental Results

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If the chemical inhomogeneity profile is known a priori, kinetic modeling software such as diffusion-controlled transformations (DICTRA) can be used to model the homogenization kinetics of an alloy. In this study, the Scheil module within the Thermo-Calc software was used to predict the as-cast segregation present within the Ni-based superalloy Nimonic 105. The segregation profiles were read into DICTRA to refine the homogenization heat treatment of this alloy. The thermodynamic and kinetic modeling of the computationally predicted heat treatment and microstructure, and subsequent experimental verification on a real casting of Nimonic 105, are presented.

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Acknowledgments

The authors acknowledge the assistance of Ed Argetsinger (casting), Paul Danielson (metallography), as well as Paul Mason, Zi-Kui Liu, Qing Chen, and John Ågren for helpful suggestions with the Thermo-Calc and DICTRA software. This work was performed as part of the United States DOE/OCDO USC Steam Turbine Consortium. Special thanks are given to R. Viswanathan, R. Purgert, P. Rawls, B. Romanowski, and M. Marrocco for their leadership and support of the program.

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Authors and Affiliations

  1. United States Department of Energy, National Energy Technology Laboratory, Albany, OR, 97321, USA

    Paul D. Jablonski (Metallurgist) & Christopher J. Cowen (Metallurgist)

  2. Parsons Corporation, South Park, PA, 15129, USA

    Christopher J. Cowen (Metallurgist)

Authors
  1. Paul D. Jablonski
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  2. Christopher J. Cowen
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Correspondence to Christopher J. Cowen.

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Manuscript submitted November 6, 2008.

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Jablonski, P.D., Cowen, C.J. Homogenizing a Nickel-Based Superalloy: Thermodynamic and Kinetic Simulation and Experimental Results. Metall Mater Trans B 40, 182–186 (2009). https://doi.org/10.1007/s11663-009-9227-1

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  • DOI: https://doi.org/10.1007/s11663-009-9227-1

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