Topic：Challenges for the design of Ni-based SX superalloys components

Speaker: Jonathan Cormier

Institut Pprime, UPR CNRS 3346, Physics and Mechanics of Materials Department, ISAE-ENSMA, 1 avenue Clément Ader, BP 40109, 86961 Futuroscope Chasseneuil, France

Time: 9:00-10:30, (Mon.) May 27^th, 2019

Venue: Room 403, Shi Changxu Building, IMR CAS

Abstract:

Increasing the operating temperatures is the most reliable way to improve gas turbine efficiency of aero-engines and industrial gas turbines. A dramatic temperature 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 5^th and 6^th 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.