About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
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Symposium
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30 Years of Nanoindentation with the Oliver-Pharr Method and Beyond
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Presentation Title |
Nanoindentation to Determine High Temperature Rate Effects in Advanced Nuclear Reactor Steels |
Author(s) |
Moujhuri Sau, Zezhou Li, Eric Hintsala, Douglas Stauffer, Laurent Capolungo, Nathan Mara |
On-Site Speaker (Planned) |
Moujhuri Sau |
Abstract Scope |
Nanoindentation is a versatile, high throughput, nondestructive technique for testing mechanical properties of materials at the nano- and micro-scales. Through recent developments in nanoindentation technology, this method can explore the relationship between the microstructural features of materials and their creep deformation responses. Elevated temperature nanoindentation tests were performed on three different reactor steel materials and a reference material– T91 ferritic martensitic alloy, an ODS alloy (MA957) and a FeCrAl alloy (APMT), and austenitic stainless steel (SS347H). We determined the strain rate sensitivity (SRS), activation energy and activation volumes using nanoindentation creep testing on a Bruker Hysitron Vacuum Indenter System, and observe increases in SRS that can be correlated to material microstructure and bulk creep tests. We will explain these behaviors in terms of the dominant diffusion and dislocation-based creep mechanisms, as well as the Portevin-Le Chatelier effect arising from dynamic strain aging at a narrow range of test conditions. |
Proceedings Inclusion? |
Planned: |
Keywords |
Nuclear Materials, Iron and Steel, Nuclear Materials |