Multiscale Study on Irradiation Effect of A508- III Steel by Experimental Observation and Crystal Plasticity Finite Element Model

作     者：Lin, Pan-Dong Nie, Jun-Feng Cui, Wen-Dong He, Lei Lu, Yu-Peng Cui, Shu-Gang Xiang, Li-Xin 

作者机构：Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials Ministry of Education Shandong University Jinan250061 China School of Materials Science and Engineering Shandong University Jinan250061 China Institute of Nuclear and New Energy Technology Key Laboratory of Advanced Reactor Engineering and Safety of Ministry of Education Tsinghua University Beijing100084 China 

出 版 物：《SSRN》 

年 卷 期：2023年

核心收录：

主　　题：Ion bombardment 

摘      要：Irradiation can induce microscopic defects in reactor pressure vessel (RPV) steel, resulting in macroscopic hardening and embrittlement. In this study, Fe-ion irradiation, electron backscatter diffraction (EBSD), transmission electron microscopy (TEM), nano-indentation testing, and a crystal plasticity finite element model (CPFEM) are utilized to explore the relationship between microscopic irradiation defects and macroscopic mechanical properties of A508-Ⅲ steel. The effect of irradiation is introduced in an Fe-ion irradiation experiment. The mean size and number density of the irradiation-induced dislocation loops are measured using TEM, which is described in a power function relationship with the irradiation dose at various temperatures. The irradiation defect data obtained from the experiment are used as input parameters for the CPFEM, and nano-indentation tests of A508-Ⅲ steel under different conditions are successfully simulated. Furthermore, irradiation-induced increases in the yield stress and brittle-ductile transition temperature (BDTT) at various temperatures are investigated. The results show that the yield stress, BDTT, and degree of irradiation hardening and embrittlement increase with an increase in the irradiation dose. However, the yield stress and BDTT decrease with an increase in irradiation temperature. In addition, the size and number of irradiation defects increase with an increasing irradiation dose, and the number of dislocation loops clearly decrease with an increase in irradiation temperature. However, the size of the dislocation loops increases continuously. This work is significant for the study of the irradiation effect of RPV steel during actual operation. © 2023, The Authors. All rights reserved.