About this Abstract |
Meeting |
Superalloys 2024
|
Symposium
|
Superalloys 2024
|
Presentation Title |
B-3: How Can the Non-metallic Inclusions Distribution Lead to an Anisotropy in the Fatigue Life Durability of Forged γ/γ' Ni-based Disks Alloys? |
Author(s) |
Adèle Govaere, Moubine Al-Kotob, Xavier Baudequin, Caitline Lasne, Romain Lambert, Jonathan Leblanc, Arnaud Longuet, Nicolas Sutter, Alexia Wu, Jonathan Cormier, Azdine Nait-Ali, Malo Prié |
On-Site Speaker (Planned) |
Adèle Govaere |
Abstract Scope |
The impact of non-metallic inclusions (NMIs) and the forging process on the low-cycle fatigue (LCF) durability of a γ/γ'' superalloy is investigated. X-ray synchrotron tomography was performed to characterize the NMIs populations. Low cycle fatigue was tested at 400 °C on specimens taken in various orientations on forged disks using the ring rolling process or the die forging one. The results show anisotropic tensile and fatigue properties for the ring rolled disks, especially in radial and axial directions. On the other hand, no reduction of the lifespan was observed for the die forged ones. Fractographic observations and a macroscopic approach in modelling of a particle during forging were conducted. It showed that abnormal low lifetimes are connected to crack initiation at NMIs. However, it is not a sufficient condition. The length of NMIs stringers and their orientation in the disk are important parameters. The forging process has a strong impact on the plastic flow and the initial state of the particles. Indeed, ring rolling promotes decohesion at the interface between the inclusion and the matrix. The crack initiation time and the first stages of the propagation to the matrix highly contribute to low lifespan. A better understanding of the detrimental configurations of NMIs would allow optimized forging processes. |
Proceedings Inclusion? |
Definite: At-meeting proceedings |