[en] Point defect interactions and radiation-induced structural and phase transformations in the Fe-16%Cr-15%Ni-3%Mo austenitic steels in the initial and titanium-doped states has been investigated by residual resistivity and scanning tunneling microscopy. The part of the investigated samples were annealed at 773 K for short range ordering (SRO) and other part were annealed at 923 K for the formation of γ-phase precipitates.The steels were irradiated by 5 MeV electrons at 80 K, 320 K and 573 K and by neutrons with energy more than 0.1 MeV at 80 K. The radiation-induced formation of γ-phase precipitates with size of 2...3 nm with the concentration over 10¹⁸cm^-3 has been detected at 573 K electron irradiation by means STM investigation