About this Abstract |
| Meeting |
Materials in Nuclear Energy Systems (MiNES) 2025
|
| Symposium
|
Materials in Nuclear Energy Systems (MiNES) 2025
|
| Presentation Title |
High Throughput Assessment of Creep Behavior of Additively Manufactured Nuclear Reactor Alloys by Nanoindentation |
| Author(s) |
Nathan A. Mara, Minh-Tam Hoang, Kevin Schmalbach, Eric Hintsala, Douglas Stauffer, Benjamin Eftink, Robin Montoya, John Carpenter, Jobin 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 determine creep lifetime Grade 91 ferritic-martensitic alloy and 347H stainless steel. These techniques have the potential for order-of-magnitude improvements in the time necessary to determine creep time to rupture and subsequent alloy design and qualification. Using our combined model/experiment approach, only a few bulk tests combined with indentation testing provides the data needed to calculate creep lifetime predictions based on the well-established Larson-Miller Parameter (LMP). This stands in stark contrast to the dozens of bulk samples currently needed for a state-of-the-art creep data set. 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, and present experimental data sets from Grade 91 and 316H stainless steel for both wrought and additively manufactured conditions. |
| Proceedings Inclusion? |
Undecided |