Dimensional instability analysis of iron base alloy by rate theory

Iron based alloys are one of the most promising candidate materials for fast breeder reactor since iron based alloy could maintain reasonable mechanical strength in harsh environment condition. In this situation, there is no experiment and theoretical evidence that iron based alloy can be sustainable over 200 dpa. The preliminary result of this study could be theoretical base for safety analysis. Therefore, in this study, the aim of this study is understanding of radiation effect on the dimensional instability of iron base materials with stress applied condition. The originality of this study is consideration of self-interstitial clusters (SIAs) behavior in stress condition i.e., modification of SIAs cluster absorption rate is calculated in rate theory. Specifically, from the mean field assumption, nucleation and growth behavior of dislocation loops and void was calculated by 3D and 1D reaction kinetics in rate theory. Finally, irradiation swelling and creep were analyzed by sink behavior. The aim of this study is understanding of stress and radiation effect on irradiation swelling and creep. From the PBM approximation, sink behavior was calculated. It was confirmed that SIAs significant effect on swelling saturation. location loop number density, cluster behavior will be more specifically demonstrated by microstructural analysis in next research step.