About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Steels in Extreme Conditions
|
| Presentation Title |
Quantifying the Effect of Prior Creep Exposure on Creep Crack Growth Behavior in Grade 92 Steel |
| Author(s) |
Troy Hanes, Robert Stephens |
| On-Site Speaker (Planned) |
Troy Hanes |
| Abstract Scope |
This study presents a comparative assessment of creep crack growth (CCG) behavior in Grade 92 steel, focusing on the effects of prior creep exposure. Compact tension specimens were machined from both virgin material and samples aged to defined life fractions. CCG Tests were conducted at 650 °C, and crack extension was monitored using both direct current potential drop (DCPD) and optical in-situ imaging. Crack growth lives were compared across material conditions and analyzed using fracture mechanics parameters such as K, C*, and load line displacement (LLD). Results show that prior creep damage significantly reduces crack growth resistance, with aged specimens exhibiting higher CCG rates. The combination of DCPD and optical tracking enabled accurate assessment of damage-dependent behavior. These findings contribute to understanding how prior service exposure influences CCG resistance and support improved fitness-for-service evaluation methods for high-temperature structural components in power generation environments. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Other, Other, Other |