About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advances in the State-of-the-Art of High Temperature Alloys
|
| Presentation Title |
Microstructural and Mechanical Assessment of an Ex-Service Blade From a Land-Based Gas Turbine |
| Author(s) |
Clara Pohl, Jonathan Streitberger, Antonín Dlouhý, Gunther Eggeler |
| On-Site Speaker (Planned) |
Clara Pohl |
| Abstract Scope |
Blades in land-based gas turbines are made from Ni-base single crystal superalloys (SXs), which must withstand extreme mechanical stresses at high temperatures. Their γ/γ'-microstructure provides creep strength and thermal barrier coatings (TBCs) reduce the impact of the gas temperature. An ex-service PWA 1483 SX blade, which operated for 6000 hours at 940°C, was analyzed. Surface and bulk regions of the blade were analyzed at different blade locations (tip, middle, root). Miniature creep testing was performed to compare the creep properties in different regions of the blade. Different microstructural parameters were assessed, including dendrite spacings, γ'-particle sizes and shapes, γ-channel widths and features of the dislocation substructure. The objective of the study was to document region-specific degradation. The findings provide new insights into the mechanisms of service-induced microstructural evolution. Improved strategies for condition-based maintenance and life assessment procedures of SX components in stationary gas turbines are discussed. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Temperature Materials, Characterization, Mechanical Properties |