About this Abstract |
Meeting |
Superalloys 2024
|
Symposium
|
Superalloys 2024
|
Presentation Title |
Very High Cycle Fatigue Properties of a Coated Nickel-based Single Crystal Superalloy |
Author(s) |
Antonio Vicente Morales, Florent Mauget, Amélie Caradec, Baptiste Larrouy, Patrick Villechaise, Jonathan Cormier |
On-Site Speaker (Planned) |
Antonio Vicente Morales |
Abstract Scope |
Very High Cycle Fatigue (VHCF) properties of thermally sprayed MCrAlY coated samples of CMSX-4 at high temperature were studied. Nine fatigue tests up to failure were performed at 1000 °C, 20 kHz and R = -1 on coated samples. These samples showed lower fatigue life when compared with the bare reference. Fatal crack initiation systematically occurred at the interdiffusion zone (IDZ) between the coating and the CMSX-4 substrate or at a casting pore in the vicinity of the IDZ. Failed samples showed a high density of secondary surface cracks. In order to better understand the mechanism leading to surface cracking, one interrupted test was performed. It is shown that cracks nucleated from the very first fatigue cycles and propagated through the coating almost instantly. Surface cracks then spent most of the fatigue lifetime sitting at the IDZ/substrate interface. The fatal as well as the surface crack initiation mechanisms are discussed to better understand the durability in these VHCF conditions. |
Proceedings Inclusion? |
Definite: At-meeting proceedings |