Abstract
The influence of both topologically close-packed (TCP) phase precipitation and pores on the creep life of a single-crystal superalloy has been studied at 1323 K (1050 °C)/160 MPa. Despite very reproducible primary and secondary creep stages, the creep life is scattered for this specific condition where a very steep tertiary creep stage is observed, corresponding to a highly localized failure process. Image processing was performed after failure to determine the stereological parameters characterizing pores and TCP-phase particles. It was determined that pores are major determinants of creep life under these temperature and stress conditions. It was also observed that the average surface area or the density of pores is not sufficient to explain creep life variability. A homogenization method including modified γ/γ′ microstructure area surrounding pores and TCP-phase particles was developed and correlated to creep life. It is shown that the greater the extent of the modified microstructure, the lower the creep life. Moreover, a better understanding of the TCP-phase role in controlling the creep life was obtained: TCP-phase particles modified the local stress field and disturbed the local γ/γ′ microstructure. They enhance the generation of vacancies and subsequent nucleation and growth of pores.
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Acknowledgments
The authors are particularly grateful to the Turbomeca–SAFRAN group for providing the material and to the DPAC (Direction des Programmes Aéronautiques et de la Coopération) for its financial support. This work is conducted under a French program involving Snecma-SAFRAN group, Turbomeca-SAFRAN group, ONERA, CNRS Laboratories (Mines Paris Tech, Institut P’-ENSMA, LMT-Cachan, LMS-X, CIRIMAT-ENSIACET), and CEAT. J.-B. le Graverend is also grateful to D. Pacou, V. Bonnand, and R. Degeilh for stimulating discussions. Dr Zéline Hervier (Materials Department at Turbomeca SAFRAN group) is gratefully acknowledged for her encouragements and continuous interest in this work.
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Manuscript submitted August 26, 2011.
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Le Graverend, JB., Cormier, J., Kruch, S. et al. Microstructural Parameters Controlling High-Temperature Creep Life of the Nickel-Base Single-Crystal Superalloy MC2. Metall Mater Trans A 43, 3988–3997 (2012). https://doi.org/10.1007/s11661-012-1207-4
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DOI: https://doi.org/10.1007/s11661-012-1207-4