| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Sustainability of High Temperature Alloys
|
| Presentation Title |
Effects of an oxidising environment on the dwell fatigue of single crystal Ni-based superalloys at intermediate service temperature |
| Author(s) |
Joseph Doyle, Edward Saunders, Jane Woolrich, Nong Gao, Philippa Reed |
| On-Site Speaker (Planned) |
Joseph Doyle |
| Abstract Scope |
Ni-based single crystal superalloys are widely used to manufacture turbine blades for jet engines due to their excellent combination of high temperature mechanical properties and corrosion resistance. At elevated temperatures, fatigue crack propagation is governed by the combined effects of mechanical loading and environment. In this work the effects of dwell on the fatigue crack propagation in single crystal superalloys CMSX-4 and CMSX-10 have been studied at an intermediate service temperature (550°C) in an oxidising environment and an inert gas (low oxidising) environment. Three-point bend tests were conducted on single edge notched bend bars with a load ratio 0.1, tested under constant load using a trapezoidal waveform of 1-1-1-1 (baseline) and 1-90-1-1 (dwell). Crack growth was monitored using the direct current potential drop method and fatigue crack propagation mechanisms have been assessed using optical microscopy and scanning electron microscopy to characterise the fracture surfaces and determine the controlling failure mechanisms. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Temperature Materials, Copper / Nickel / Cobalt, Environmental Effects |