Speaker
Annick Froideval
(High Temperature Materials, LNM / NES, Paul Scherrer Institute, 5232 Villigen PSI, Switzerland)
Description
Ferritic oxide dispersion strengthened (ODS) steels are considered as candidate materials for fuel claddings in Generation IV nuclear energy systems. Amongst their prerequisite properties, ODS steels have to retain their dimensional stability over the operating conditions targeted for this next generation of nuclear reactors. Mechanical testing is thus necessary to ascertain that these materials comply with the requirements of the nuclear safety specifications. The aims of the present work are thus to determine (i) the tensile properties of two ODS steels with distinct microstructure and (ii) the effect of the anisotropy of the grain microstructure on their microscopic mechanical properties. In situ neutron diffraction during tensile loading has been carried out at POLDI. During deformation, the evolution of the lattice strain has been derived through the profile analysis of several Bragg diffraction peaks. Post-deformation fractography and microstructural studies have been performed using SEM and TEM. A deeper insight into the interplay microstructure / mechanical properties has been obtained. This is crucial for the design optimization of such nuclear-energy related materials.
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Primary author
Annick Froideval
(High Temperature Materials, LNM / NES, Paul Scherrer Institute, 5232 Villigen PSI, Switzerland)
Co-authors
Eugénia Minikus
(Fusion Technology Materials, CRPP, Ecole Polytechnique Fédérale de Lausanne, Lausanne, Switzerland)
Hans J. Leber
(Component Safety, LNM / NES, Paul Scherrer Institute, 5232 Villigen PSI, Switzerland)
Dr
Jiachao Chen
(High Temperature Materials, LNM / NES, Paul Scherrer Institute, 5232 Villigen PSI, Switzerland)
Manuel A. Pouchon
(High Temperature Materials, LNM / NES, Paul Scherrer Institute, 5232 Villigen PSI, Switzerland)
Steven Van Petegem
(Materials Science and Simulation, ASQ / NUM, Paul Scherrer Institute, 5232 Villigen PSI, Switzerland)
Vadim Davydov
(Materials Science and Simulation, ASQ / NUM, Paul Scherrer Institute, 5232 Villigen PSI, Switzerland)
