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On the Mechanical Behavior of a New Single-Crystal Superalloy for Industrial Gas Turbine Applications

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Abstract

The mechanical behavior of a new single-crystal nickel-based superalloy for industrial gas turbine (IGT) applications is studied under creep and out-of-phase (OP) thermomechanical fatigue (TMF) conditions. Neutron diffraction methods and thermodynamic modeling are used to quantify the variation of the gamma prime (γ′) strengthening phase around the γ′ solvus temperature; these aid the design of primary aging heat treatments to develop either uniform or bimodal microstructures of the γ′ phase. Under creep conditions in the temperature range 1023 K to 1123 K (750 °C to 850 °C), with stresses between 235 to 520 MPa, the creep performance is best with a finer and uniform γ′ microstructure. On the other hand, the OP TMF performance improves when the γ′ precipitate size is larger. Thus, the micromechanical degradation mechanisms occurring during creep and TMF are distinct. During TMF, localized shear banding occurs with the γ′ phase penetrated by dislocations; however, during creep, the dislocation activity is restricted to the matrix phase. The factors controlling TMF resistance are rationalized.

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Acknowledgments

The authors are grateful to Siemens Industrial Turbomachinery AB in Sweden for sponsoring this work. The invaluable advice and support of Dr. Cathie Rae, University of Cambridge, is acknowledged. Mr. Peter Cranmer, University of Birmingham, for casting, Ms. Ming Chu for TEM foil preparation, Mr. Frank Biddlestone for DSC, Dr. Edward Oliver, ISIS, and Dr. David Dye, Imperial College London, for in-situ neutron diffractometry are thanked for their invaluable assistance.

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Authors and Affiliations

  1. Department of Metallurgy and Materials, University of Birmingham, Edgbaston, Birmingham, B15 2TT, United Kingdom

    Atsushi Sato (Postdoctoral Student) & Roger C. Reed (Professor)

  2. Division of Engineering Materials, Department of Management and Engineering, Linköping University, 58183, Linköping, Sweden

    Johan J. Moverare (Associate Professor)

  3. Siemens Industrial Turbomachinery AB, 61283, Finspång, Sweden

    Magnus Hasselqvist (Specialist)

Authors
  1. Atsushi Sato
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  2. Johan J. Moverare
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  3. Magnus Hasselqvist
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  4. Roger C. Reed
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Corresponding author

Correspondence to Roger C. Reed.

Additional information

Manuscript submitted January 31, 2011.

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Sato, A., Moverare, J.J., Hasselqvist, M. et al. On the Mechanical Behavior of a New Single-Crystal Superalloy for Industrial Gas Turbine Applications. Metall Mater Trans A 43, 2302–2315 (2012). https://doi.org/10.1007/s11661-011-0995-2

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