| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Elucidating Microstructural Evolution Under Extreme Environments
|
| Presentation Title |
Correlative Microscopy of Creep Cavitation in Ferritic, Martensitic and Austenitic Steels |
| Author(s) |
Tomas Martin, Eirini Galliopoulou, Siqi He, Michael Salvini, Nicolo Grilli, Alan Cocks, Peter Flewitt |
| On-Site Speaker (Planned) |
Tomas Martin |
| Abstract Scope |
Creep cavitation is a major degradation mechanism that limits the life of high temperature components in advanced gas-cooled nuclear fission and fusion reactors. Understanding how atomic scale processes lead to the formation and subsequent interlinkage of creep cavitation damage is complex and requires advanced characterization and modelling. Here we present a novel multi-length scale correlative approach to characterize creep cavitation in 316H austenitic steel and 9Cr1Mo steels in both ferritic and martensitic conditions. A combination of stitched high resolution scanning electron microscopy, XeF2-assisted focused ion beam imaging and electron backscatter diffraction is used, together with advanced image processing to create mm-length scale spatially-resolved datasets in both 2D and 3D. These correlate the position, size and morphology of creep cavities with precipitation, grain orientation and local stress. The differences between creep cavity formation for the different microstructure steels is discussed together with the outcomes from crystal plasticity modelling. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Characterization, Iron and Steel, High-Temperature Materials |