| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Nanostructured Materials in Extreme Environments III
|
| Presentation Title |
Property Mapping and Creep Behavior of Advanced Nuclear Reactor Alloys Via Nanoindentation |
| Author(s) |
Nathan A. Mara, Minh-Tam Hoang, Kevin Schmalbach, Eric Hintsala, Douglas Stauffer, Jobin K. Joy, Laurent Capolungo |
| On-Site Speaker (Planned) |
Nathan A. Mara |
| Abstract Scope |
The recent rapid development of steels for service in nuclear reactors has outpaced the ability for experiments to supply the needed guidance and validation of polycrystalline deformation models. Our recent work demonstrates that a combination of high-throughput, high-temperature indentation Strain Rate Jump Tests (SRJT) and a few bulk dead-load creep tests is sufficient to predict creep lifetime in Grade 91 ferritic-martensitic alloy. based on the well-established Larson-Miller Parameter (LMP). We show that elevated temperature strain rate jump testing can provide insight into the critical parameters (strain rate or stress exponent, activation volume, activation energy for diffusion) that describe the site-specific, or aggregate dominant creep mechanisms for a given set of creep conditions. We will describe the transitions in mechanisms between room and elevated temperatures in terms of a microstructurally-informed model, and experimental data sets from Grade 91, FeCrAl, and Oxide Dispersion Strengthened (ODS) steels engineered for extreme conditions. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Temperature Materials, Nuclear Materials, Mechanical Properties |