About this Abstract |
Meeting |
Superalloys 2024
|
Symposium
|
Superalloys 2024
|
Presentation Title |
Fatigue Durability of a Single Crystal Nickel-based Superalloy with Prior Corrosion |
Author(s) |
A. Martin, E. Drouelle, J. Rame, Fernando Pedraza, J. Cormier |
On-Site Speaker (Planned) |
Fernando Pedraza |
Abstract Scope |
The impact of hot corrosion on the low-cycle fatigue (LCF) life of the AM1 Ni-based single-crystal (SX) superalloy in as-cast (AC) and fully heat-treated (FHT) states has been studied. Microstructural features such as pores and chemical segregation have a significant impact on LCF fatigue strength at 950 °C. Surface pores act as stress concentration zones, influencing crack initiation and propagation. The reduction in the chemical dendritic segregation through solution heat treatment improves the LCF resistance. Pre-corrosion lowers the LCF lives by increasing stress concentration and facilitating multiple crack initiations with a brittle, spalled corrosion layer on the surface. The mechanical degradation occurs simultaneously to hot corrosion and oxidation, the latter being influenced by the distance from the layer undergoing hot corrosion. Heat treatment still appears to be a positive factor in improving the service life of AM1. |
Proceedings Inclusion? |
Definite: At-meeting proceedings |