Insights from an OKMC simulation of dose rate effects on the irradiated microstructure of RPV model alloys

Li Jianyang; Zhang Chonghong; Martin-Bragado Ignacio; Yang Yitao; Wang Tieshan

doi:10.1016/j.net.2022.11.018

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자료유형: 학술저널

저자정보: Li Jianyang (Institute of Modern Physics Chinese Academy of Sciences) Zhang Chonghong (Institute of Modern Physics Chinese Academy of Sciences) Martin-Bragado Ignacio (UCAM Universidad Catolica de Murcia Campus de Los Jeronimos) Yang Yitao (Institute of Modern Physics Chinese Academy of Sciences) Wang Tieshan (School of Nuclear Science and Technology Lanzhou University)

저널정보: 한국원자력학회 Nuclear Engineering and Technology Nuclear Engineering and Technology 제55권 제3호

발행연도: 2023.3

수록면: 958 - 967 (10page)

DOI: 10.1016/j.net.2022.11.018

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This work studies the defect features in a dilute FeMnNi alloy by an Object Kinetic Monte Carlo (OKMC) model based on the "grey-alloy" method. The dose rate effect is studied at 573 K in a wide range of dose rates from 10 8 to 10 4 displacement per atom (dpa)/s and demonstrates that the density of defect clusters rises while the average size of defect clusters decreases with increasing dose rate. However, the dose-rate effect decreases with increasing irradiation dose. The model considered two realistic mechanisms for producing <100>-type self-interstitial atom (SIA) loops and gave reasonable production ratios compared with experimental results. Our simulation shows that the proportion of <100>-type SIA loops could change obviously with the dose rate, influencing hardening prediction for various dose rates irradiation. We also investigated ways to compensate for the dose rate effect. The simulation results verified that about a 100 K temperature shift at a high dose rate of 1 10 4 dpa/s could produce similar irradiation microstructures to a lower dose rate of 1 10 7 dpa/s irradiation, including matrix defects and deduced solute migration events. The work brings new insight into the OKMC modeling and the dose rate effect of the Fe-based alloys.

#Irradiation defects #RPV model Alloy #Dose-rate effect #Object kinetic Monte Carlo

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