About this Abstract |
Meeting |
Superalloys 2024
|
Symposium
|
Superalloys 2024
|
Presentation Title |
Effect of Strain Rate on Dynamic Recrystallization of a Typical γ-γ’ Nickel-Based Superalloy with Initial Bimodal Precipitation |
Author(s) |
Federico Orlacchio, Daniel Pino Munoz, Madeleine Bignon, Chi-Toan Nguyen, Ilusca Soares Janeiro, Marc Bernacki, Nathalie Bozzolo |
On-Site Speaker (Planned) |
Nathalie Bozzolo |
Abstract Scope |
The effect of strain rate on microstructure evolution of a γ-γ' nickel-based superalloy during hot deformation has been examined in this study. The experiments were conducted below the γ'-phase solvus temperature, at 1050 °C with various strain rates (10-1, 10-2 and 10-3 S-1) up to different macroscopic strain level (0.2, 0.8 and 1.3). An inverse effect of strain rate on dynamic recrystallization has been observed with an increase in the recrystallized fraction as strain rate increases, for a fixed macroscopic strain level. Scanning electron microscope and electron backscattered diffraction analysis were employed to investigate the deformed microstructures in terms of γ phase evolution and γ' precipitation state. A constant average size value of recrystallized grains at 1 μm is obtained for all tested conditions, suggesting that nucleation of new dynamically recrystallized grains is favored at the expense of the growth of recrystallized grains during hot deformation, which is inhibited. Furthermore, the complete absence of fine γ' precipitation within dynamically recrystallized grains, reveals a strong interaction between the progress of recrystallization front and the presence of fine γ' precipitates. |
Proceedings Inclusion? |
Definite: At-meeting proceedings |