Author/Authors :
Tanigawa، نويسنده , , H. and Ando، نويسنده , , M. and Katoh، نويسنده , , Y. and Hirose، نويسنده , , T. and Sakasegawa، نويسنده , , H. and Jitsukawa، نويسنده , , S. and Kohyama، نويسنده , , A. and Iwai، نويسنده , , T.، نويسنده ,
Abstract :
Effects of high-fluence irradiation in fusion-relevant helium production condition on defect cluster formation and swelling of reduced activation ferritic/martensitic steels (RAFs), JLF-1 (Fe–9Cr–2W–V–Ta) and F82H (Fe–8Cr–2W–V–Ta), have been investigated. Dual-ion (nickel plus helium ions) irradiation using electrostatic accelerators was adopted to simulate fusion neutron environment. The irradiation has been carried out up to a damage level of 100 displacement per atom (dpa) at around 723 K, at the HIT facility in the University of Tokyo. Thin foils for transmission electron microscopy (TEM) were prepared with a focused ion beam (FIB) microsampling system. The system enabled not only the broad cross-sectional TEM observation, but also the detailed study of irradiated microstructure, since unfavorable effects of ferromagnetism of a ferritic steel specimen were completely suppressed with this system by sampling a small volume in interests from the irradiated material.
