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Prevalence of Heteroepitaxial Recrystallization in the Low Solvus High Refractory (LSHR) γ–γ′ Superalloy

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Abstract

Heteroepitaxial recrystallization (HeRX) is a recently discovered recrystallization mechanism that can occur during thermomechanical processing of Ni-base superalloys. It is important to understand this mechanism because it offers insights into grain size control, which is critical to the tensile, fatigue, and creep properties of superalloys. In this paper, HeRX activity in the low solvus high refractory (LSHR) is quantitatively characterized using combined energy-dispersive X-ray spectroscopy and electron backscatter diffraction. The formation of heteroepitaxially recrystallized grains is observed within the intermediate-misfit γ–γ′ superalloy LSHR; this suggests the HeRX is more widespread than initially thought. Microstructural imaging indicates that the presence of a coherent γ shell formed via inverse precipitation is not a necessary condition for the nucleation of HeRX grains. HeRX grains are found to comprise the large grain tail of the grain size distribution, regardless of processing condition. The extent of HeRX grain formation and growth in LSHR is determined as a function of strain, forging rate, and thermal history.

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Acknowledgments

The authors would like to acknowledge B. Dowdell (NCSU) for the early stage SEM/EBSD data collection, and P. Fagin (AFRL and UES, Inc.) for assistance with mechanical testing and S. L. Semiatin (AFRL) for helpful discussions, as well as A. Pilchak (AFRL/RXCM), J. Shank (AFRL and UES Inc.), and J. Craggette (SOCHE and Wright State University) for assistance with DEFORM simulations and data visualizations.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, University of Florida, Gainesville, FL, 32611, USA

    Y. Lee, E. Hershkovitz, H. Kim & V. M. Miller

  2. Air Force Research Laboratory, Wright-Patterson Air Force Base, Dayton, OH, 45433, USA

    K. N. Wertz

  3. Department of Materials Science and Engineering, University of Cincinnati, Cincinnati, OH, 45219, USA

    E. J. Payton

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  1. Y. Lee
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Lee, Y., Hershkovitz, E., Kim, H. et al. Prevalence of Heteroepitaxial Recrystallization in the Low Solvus High Refractory (LSHR) γ–γ′ Superalloy. Metallogr. Microstruct. Anal. 13, 114–129 (2024). https://doi.org/10.1007/s13632-023-01036-z

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