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Characterization of Plastic Deformation Induced by Shot-Peening in a Ni-Base Superalloy

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Abstract

The shot-peening process is currently employed in most industries to improve the longevity of components by inhibiting crack initiation as well as crack growth at the surface. The protective effect of shot peening has been mainly attributed to compressive stresses within the deformed layer. Intensive research has been carried out to quantify the near-surface residual stresses on entry into service and evolution throughout life. In nickel-base superalloys, the focus of research on the effects of shot-peening has performed using x-rays from either laboratory or synchrotron-based sources. However, this approach cannot evaluate in detail the deformation mechanisms nor the role of the γ′ precipitates in a nickel-base superalloy; the latter is responsible for its unique properties. Our study uses a complementary range of techniques to investigate in detail the microstructure and deformation mechanisms associated with shot-peening in a coarse-grained nickel-based superalloy strengthened with coherent γ′ precipitates. These include scanning electron microscopy and transmission electron microscopy, nanoindentation and micropillar compression. Accurate mapping of the dislocation structure produced throughout the deformed layers have been performed. Using an unconventional specimen preparation technique, it provides the basis for a more complete interpretation of how shot-peening inhibits fatigue cracking.

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Acknowledgements

The authors would like to acknowledge the efforts of the EPSRC, Rolls-Royce plc. for their financial support in the completion of this work (EPSRC and Rolls-Royce Strategic Partnership: EP/H500375/1 and EP/H022309 and the TSB project SILOET TP number: AB266C/4). Rolls-Royce plc. is also gratefully acknowledged for supplying the material. The authors would also like to thank Dr. Claudia Walter for the introduction to FIB scripting that enabled the production of micropillars and subsequent compression.

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Authors and Affiliations

  1. Rolls-Royce UTC, Department of Materials Science & Metallurgy, University of Cambridge, Cambridge, CB3 0FS, UK

    O. M. D. M. Messé & C. M. F. Rae

  2. Linköping University, Campus Valla, 581 83, Linköping, Sweden

    S. Stekovic

  3. Rolls-Royce plc., Derby, DE24 8BJ, UK

    M. C. Hardy

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  1. O. M. D. M. Messé
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  2. S. Stekovic
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  3. M. C. Hardy
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  4. C. M. F. Rae
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Correspondence to O. M. D. M. Messé.

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Messé, O.M.D.M., Stekovic, S., Hardy, M.C. et al. Characterization of Plastic Deformation Induced by Shot-Peening in a Ni-Base Superalloy. JOM 66, 2502–2515 (2014). https://doi.org/10.1007/s11837-014-1184-8

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  • DOI: https://doi.org/10.1007/s11837-014-1184-8

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