LAUSR

Abstract To access irradiation conditions of candidate materials used in advanced nuclear energy systems, simultaneous helium and iron-ion irradiation have been widely used to study on the synergistic effects of helium bubble nucleation and displacement damage. In present study, nano-indentation was used to study the irradiation hardening of F82H, T91, SIMP and ODS steels under dual Fe3+/He+-ion irradiation. Two different irradiation temperatures (300℃ and 450℃), three different helium injection ratios (60 appm He/dpa, 200 appm He/dpa and 600 appm He/dpa, displacements per atom: dpa), the same irradiation damage (5 dpa), were chosen. The effect of helium concentration on irradiation hardening was investigated. The irradiation hardness of these four kinds of common structural materials was compared. The research results are useful for the development of irradiation hardening resistant Fe-Cr alloy steels in future.