MD/RT analysis on microstructural evolution during charged particle irradiation in martensitic and austenitc steels at temperatures 673 K

Abe, Yosuke; Onitsuka, Takashi; Ando, Masami; Okubo, Nariaki   ; Jitsukawa, Shiro

Fe ion-beam irradiation at 5MeV and electron beam irradiation at 1MeV (in-situ observation with a High Voltage Electron Microscope) have been performed to damage levels up to 10 displacements per atom at temperatures ranging between ambient temperature and 673K. Results were qualitatively agreed with those obtained by the fission reactor irradiation experiments. Microstructural change has been analyzed by computational simulation technique with molecular dynamics and rate theory models. Damage level and temperature dependence of size and number density of defect clusters obtained by calculation with parameters of point defect mobility, defect cluster mobility, sink strength, temperature and damage rate are compared with results by transmission electron microscopy on irradiated martensitic and austenitic steels. Significance of the mobility and sink strength of defect clusters is discussed.