Abstract
With the aim of understanding how to further improve the creep resistance of Co-Al-W-base superalloys at higher temperature (> 1223 K), the creep behavior of a novel Co-Al-W-base single-crystal superalloy at 1273 K/137 MPa was systematically investigated. Several interrupted creep tests were performed and the main deformation mechanisms of characteristic creep stages were identified and correlated to both the γ/γ′ microstructural and dislocation substructural evolutions. Two steady-state creep stages were observed during the creep process. The interfacial dislocations and the formation of rafts were responsible for the first steady-state creep stage, while the second steady-state creep stage could be ascribed to interactions between stacking faults of different slip systems in an inverted γ/γ′ microstructure, e.g., the formation of Lomer–Cottrell locks by the leading partials of the SFs. The observed creep mechanisms were compared to those typical of Ni-base superalloys at similar creep conditions. It is suggested that a high stacking fault energy of the γ′ phase and a higher γ′ volume fraction may be favorable for creep resistance of Co-Al-W-base single-crystal superalloys by promoting the double steady-state creep phenomenon.
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Acknowledgments
This work was financially supported by the National Key Research and Development Program of China (Grant No.: 2017YFB0702902) and National Natural Science Foundation of China (Grant No.: 51771019). The authors are very grateful to H.J Zhou, F. Xue, D.Z. Tang, and Y.S. Zhao for their contribution during the investigation of Co-base superalloys.
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Lu, S., Antonov, S., Li, L. et al. Two Steady-State Creep Stages in Co-Al-W-Base Single-Crystal Superalloys at 1273 K/137 MPa. Metall Mater Trans A 49, 4079–4089 (2018). https://doi.org/10.1007/s11661-018-4776-z
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DOI: https://doi.org/10.1007/s11661-018-4776-z