About this Abstract |
Meeting |
Superalloys 2024
|
Symposium
|
Superalloys 2024
|
Presentation Title |
D-5: Analysis of the Recovery Potential Through Repair of Key Tensile Properties for a Second Generation Ni-based SX Superalloy Exposed to Simulated Routine Service Conditions |
Author(s) |
Marco Panella, Liren Zheng, Magdalena Futoma, Caspar Schwalbe, Dominique Eyidi, Patrick Villechaise, Jonathan Cormier |
On-Site Speaker (Planned) |
Marco Panella |
Abstract Scope |
Nickel-based single-crystal turbine components used for aero-engine turbine blades are exposed to cycles of temperature and stress during routine service. High temperature exposure (exceeding about 950 °C) results in a transformation of the precipitation from cuboidal to coarsened morphology. The coarsened microstructure has a detrimental effect on the mechanical properties and, therefore, lifespan of the component. In the present study, simulated service conditions (approximated by non-isothermal creep tests) were applied to SC2000 specimens. The effects of the non-isothermal creep deformation and a rejuvenation heat treatment on the alloy’s microstructure and tensile and creep properties was analyzed. Non-isothermal creep tests were performed with a base temperature of 900°C and a peak temperature of 1100°C. SEM analysis confirmed a quick deterioration of the microstructure exposed to the simulated service coupled with a marked dislocations activity around the precipitates. In order to restore the initial properties, a super-solvus rejuvenation heat treatment was applied after deformation. The rejuvenation process successfully restored the initial precipitates morphology and the yield strength, while no improvement in creep properties was observed. Hypotheses and investigations are presented to explain this effect. |
Proceedings Inclusion? |
Definite: At-meeting proceedings |