Challenges for the design of Ni-based SX superalloys components

Orateur : Jonathan CORMIER

Increasing the operating temperatures is the most reliable way to improve gas turbine efficiency of aero-engines and industrial gas turbines. A dramatic temp erature increase has been obtained in the last four decades by adjusting chemical compositions of cast Ni-based superalloys and by using specific processing routes (e.g. directional solidification). However, despite the recent developments of the 5th and 6th generation of Ni-based SX superalloys, it seems that the expected gain in operating temperature by adjusting the chemistry are rather limited. In this presentation, a special focus will be paid to the improvements still possible in mechanical properties associated to the processing conditions of Ni-based SX superalloys, as well as the consequences of a low temperature plastic deformation introduced in the fabrication stages of SX blades. An overview of their performances under aero-engine certification conditions will also be proposed. Finally, it will be shown how the use of advanced in situ characterization techniques allows much more reliable lifing methodologies of these components.

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