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Thermomechanical Fatigue Tests Development and Life Prediction of a Nickel Base Superalloy

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Abstract

Thermomechanical fatigue (TMF) tests are carried out in order to characterize the behavior of turbine blades and vanesmaterials: superalloys. These materials suffer high stress levels at very high temperature and to simulate these extreme operation conditions a test-piece is subjected to controlled thermal and mechanical strain waveforms. In this paper, a test procedure is explained, which is unusual due to the fact that the heating system is based on direct resistance method and temperature is controlled by means of a pyrometer. For this purpose, emissivity evolution was studied. The effectiveness of the method, as well as some other important aspects such as alignment and a proper thermal–mechanical strain decoupling are discussed. Finally, some preliminary results of the cyclic behavior and life prediction of C-1023 nickel base superalloy are introduced. This also includes an analysis of specimens fractography.

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Acknowledgments

Thanks are given to ITP (Spain) for its financial support and materials; to the Spanish Ministry of Science and Innovation for the financial support (project MAT2008-03735/MAT) and to the Basque Government (project PI09-09). AGY would also like to thank Asociación de Amigos de la Universidad de Navarra for the received fellowship.

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Authors and Affiliations

  1. CEIT and TECNUN, University of Navarra, Paseo Manuel Lardizabal, 15, 20018, San Sebastián, Spain

    A. García de la Yedra, J. L. Pedrejón, A. Martín-Meizoso & R. Rodríguez

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  1. A. García de la Yedra
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  2. J. L. Pedrejón
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  3. A. Martín-Meizoso
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  4. R. Rodríguez
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Correspondence to A. García de la Yedra.

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de la Yedra, A.G., Pedrejón, J.L., Martín-Meizoso, A. et al. Thermomechanical Fatigue Tests Development and Life Prediction of a Nickel Base Superalloy. Exp Tech 40, 777–787 (2016). https://doi.org/10.1007/s40799-016-0078-9

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  • DOI: https://doi.org/10.1007/s40799-016-0078-9

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