About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
|
Environmentally Assisted Cracking: Theory and Practice
|
Presentation Title |
Effect of Mo and W on Corrosion of Ni-superalloys |
Author(s) |
Cynthia Rodenkirchen |
On-Site Speaker (Planned) |
Cynthia Rodenkirchen |
Abstract Scope |
Hot corrosion of Ni-based superalloys for aeroengine applications is commonly observed at temperatures around 900 °C (type I) and 700 °C (type II). Recently, a new type of hot corrosion including environmentally assisted cracking has been observed at unexpectedly low temperatures around 550 °C. This work investigates the effect of alloying elements Mo and W on corrosion resistance of Ni-based superalloys at 550 °C through characterisation of developmental alloys with systematic compositional changes. Oxide scale formation as the first barrier against hot corrosion and surface corrosion under salt and SO3(g) environment at 550°C are compared to oxidation and corrosion at 700 °C. Environmentally assisted cracking under salt, SO3(g), and fatigue load at 550°C is compared to cracking in vacuum and air, providing insights into the mechanisms of this new type of corrosion, the role of a corrosive environment and the effect of Mo and W additions, informing future alloy developments. |
Proceedings Inclusion? |
Planned: |
Keywords |
Copper / Nickel / Cobalt, Environmental Effects, Characterization |