Recent Studies at Onera on Superalloys for Single Crystal Turbine Blades


P. Caron, O. Lavigne

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Recent alloy development works conducted at Onera for single crystal turbine blade applications succeeded in identifying specific nickel-based superalloys suited for very high temperature applications in aircraft engines and for land-based gas turbine applications in a highly corrosive environment. Various studies concerning the mechanical behavior of such single crystal superalloys showed significant effects of the chemical, microstructural and physical characteristics on the deformation mechanisms, as well as on the creep, tensile and fatigue strength of these materials. Finally, the interactions between some SC superalloys and their protective coatings were investigated, in order to evaluate their influence on the mechanical properties and on the microstructural changes in the coated alloy.