| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Sustainability of High Temperature Alloys
|
| Presentation Title |
Very high cycle fatigue life of Ni-based SX superalloy subjected to hot corrosion |
| Author(s) |
Luciana Maria Bortoluci Ormastroni, Fernando Pedraza, Jonathan Cormier |
| On-Site Speaker (Planned) |
Luciana Maria Bortoluci Ormastroni |
| Abstract Scope |
The impact of hot corrosion on the very high cycle fatigue life and the failure mode of the second-generation CMSX-4 Ni-based SX superalloy is investigated at high temperatures (1,000 °C). The hot corrosive Na2SO4 salt was deposited on (i) the bare substrate and (ii) Al-coated substrate. Both configurations lead to a fatigue life lower than the uncorroded reference material and distinct failure modes were observed. The corroded bond coat underwent a drastic reduction of the fatigue properties. Post-mortem analyses were carried to investigate the crack initiation mode under these severe conditions. The samples failed by three different mechanisms depending on the applied stress. The analyses suggests that under the conditions of 1,000 °C/20 kHz and fully reversed loading the bond coating exhibits a brittle mechanical behavior and that the Na2SO4 corrosion coupled with the premature crack damage leads to a direct attack on the substrate and a premature failure. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Temperature Materials, Environmental Effects, Mechanical Properties |