Microstructural evolution of nickel-doped 9Cr steels irradiated in HFIR

摘要: Abstract The microstructures of reduced-activation ferritic/martensitic steels, 9Cr–1MoVNb, 9Cr–1MoVNb–2Ni, 9Cr–2WVTa and doped with 2% Ni, irradiated at 400 °C up to 12 dpa in the high flux isotope reactor, were investigated by transmission electron microscopy. cavity number density Ni-doped steels was higher than that Ni-undoped due concentration helium. There no difference between tempered 700 750 °C, but mean size cavities larger °C. a tendency for loops be steels. In addition, those while there not much them. irradiation-produced precipitates, identified as M 6 C( η )-type carbide 2 X phase, found 9Cr–2VWTa–2Ni steel respectively. Irradiation showed effect helium on nucleation, however, dislocation structure precipitation made clear.