The work is devoted to a study of post-dynamic recrystallization in a recently developed nickel-based superalloy SDZhS-15 manufactured by ingot metallurgy and intended for disc applications. The as-cast superalloy was subjected to long-term homogenization annealing and canned forging at subsolvus temperatures (T=Ts-(40-70), where Ts is the γ′ solvus temperature) under quasi-isothermal conditions. This led to the formation of a refined recrystallized fine-grained structure with individual non-recrystallized γ grains in the central part of the forged workpiece. However, in the near-surface layers of the forged workpiece, the volume fraction of non-recrystallized grains was appreciably higher. To further recrystallize the as-forged microstructure the recrystallization annealing was performed at a temperature (T=Ts-70) for different times to obtain a homogeneous recrystallized and fine-grained structure (dγ