A cast Ni-based superalloy strengthened by hafnium carbides was cast and characterized at 1100°C in creep and in hot oxidation. The as-cast microstructure formed by a dendritic matrix and eutectic scriptlike hafnium carbides (HfC) imbricated with the matrix in the interdendritic spaces is very favorable for its high mechanical properties at high temperature. This was confirmed by a three-point flexural creep test carried out at 1100°C under 20 MPa. The slow parabolic mass-gain kinetics showed that this alloy is very resistant against oxidation at 1100°C in air. The HfC carbides remained stable during these tests. The oxidation behavior was chromia-forming. This alloy is ready to be used in structural applications at a temperature reachable by only γ/γ′ Ni-based single-crystals or ODS superalloys.
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The authors wish to thank Th. Schweitzer and P. Villeger for their help.
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Published in Fizyko-Khimichna Mekhanika Materialiv, Vol. 53, No. 6, pp. 104–109, November–December, 2017.
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Conrath, E., Berthod, P. Properties of a HfC-Reinforced Nickel-Based Superalloy in Creep and Oxidation at 1100°C. Mater Sci 53, 861–867 (2018). https://doi.org/10.1007/s11003-018-0146-7
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DOI: https://doi.org/10.1007/s11003-018-0146-7