|About this Abstract
|2022 TMS Annual Meeting & Exhibition
|Phase Transformations and Microstructural Evolution
|Phase Separation under Irradiation in FeNi and Low-alloyed Steels
|Quentin Tence, Maylise Nastar, Estelle Meslin, Isabelle Mouton, Brigitte Décamps
|On-Site Speaker (Planned)
Lattice point defects induced by irradiation are recognized to have a significant effect on the solute redistribution and stability of phases in alloys. We investigate their kinetic and thermodynamic effects in Fe-Ni model alloys of ferrite and austenite. We conduct ion irradiations at JANNUS facilities on FCC Fe-Ni alloys with Ni concentrations ranging from 30 to 50 at.% under several radiation fluxes, fluences, and temperatures. TEM, STEM-EDS and APT analysis revealed various decomposition states, which all include 50 at.% Ni rich dislocation loops and significant changes of the matrix composition depending on the irradiation conditions. To model the effect of a permanent supersaturation of point defects on the dynamic equilibrium between phases, we rely on a CALPHAD database and introduce a non equilibrium point defect contribution. The resulting metastable compositions are consistent with the experimental observations. We extend this approach to Fe-based dilute model alloys of low-alloyed steels.
|Nuclear Materials, Phase Transformations, Iron and Steel