[3H01-06] Irradiation Behavior

[3H01] Ion irradiation response of cold rolled and recrystallized 12Cr ODS steel

*Jingjie Shen¹, Takuya Nagasaka¹, Takeo Muroga¹, Huilong Yang², Sho Kano², Hiroaki Abe² (1. NIFS, 2. UTokyo)

Keywords:ODS steel, Irradiation defects, Microstructure, Nanoindentation hardness

Oxide-dispersion-strengthened (ODS) steel is regarded as a candidate material in fission and fusion reactors. In this study, to reveal the stability of oxide particles, the microstructure changes of cold rolled and recrystallized 12Cr ODS steel, irradiation experiments with 2.8 MeV Fe²⁺ were conducted at room temperature (RT) and 673 K. The irradiation dose was in the range of 0.5 ~ 15 dpa. The nanoindentation hardness test and microstructural characterization were carried out. Results showed that the hardness was not evidently changed up to 15 dpa at both RT and 673 K for the cold rolled specimen. By contrast, the hardness of recrystallized specimen was increased with increasing irradiation dose. The hardening mechanisms will be presented.