TODAY: Nathan Mara, 15-Apr-25, 12:20pm Central
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Ellad Tadmor
Apr 15, 2025, 10:09:43 AMApr 15
to aem-solid...@umn.edu
AEM Mechanics Research Seminar
Tuesday 15-Apr-2025, 12:20pm Central
Prof. Nathan Mara
Department of Chemical Engineering and Materials Science, University of Minnesota
Title: A high-throughput indentation-based methodology for predicting creep rupture lifetime in nuclear reactor steels
Abstract: 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.
For more information, visit the AEM Mechanics Research Seminar website:
Tuesday 15-Apr-2025, 12:20pm Central
In-person: Room 58, Rapson Hall, University of Minnesota
Online: Webinar registration link
Department of Chemical Engineering and Materials Science, University of Minnesota
Title: A high-throughput indentation-based methodology for predicting creep rupture lifetime in nuclear reactor steels
Abstract: 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.
For more information, visit the AEM Mechanics Research Seminar website:
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Ellad B. Tadmor, Ph.D.
Russell J. Penrose Professor
Department of Aerospace Engineering and Mechanics
University of Minnesota
https://dept.aem.umn.edu/~tadmor/
Russell J. Penrose Professor
Department of Aerospace Engineering and Mechanics
University of Minnesota
https://dept.aem.umn.edu/~tadmor/
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