About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Steels in Extreme Conditions
|
| Presentation Title |
Time Dependent Creep Damage Evolution and Crack Initiation in Grade 92 Steel Under Interrupted Creep Crack Growth Testing |
| Author(s) |
Troy Hanes, Robert Stephens |
| On-Site Speaker (Planned) |
Troy Hanes |
| Abstract Scope |
This work investigates damage development and crack initiation behavior in Grade 92 steel through a series of interrupted creep crack growth (CCG) experiments at 650 °C. Using compact tension specimens tested under constant load with identical initial Kmax values, experiments were terminated at different lives to observe the onset of initial failure mechanisms. Post-test microscopy revealed damage accumulation near the crack tip, including creep cavitation, void density around the crack tip, and early signs of void coalescence. These observations were benchmarked against long-term CCG results from the same material heat to evaluate how localized damage evolves into continuous crack propagation over time. The study provides a time-resolved view of early fracture processes in ferritic-martensitic steels and emphasizes the link between sub-critical damage evolution and the onset of mechanically significant crack growth. These findings support the development of creep damage-tolerant design principles and inform component fitness-for-service assessments in elevated temperature applications. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Other, Other, Other |