Recovery processes tend to counteract the effects of work hardening during plastic deformation at high temperatures and at strain rates ranging from those of slow creep to those of rapid hot working operations. However, in metals in which recovery is relatively slow, sufficient stored energy can be accumulated to cause the occurrence of dynamic recrystallization during deformation once a critical strain is exceeded. This process then occurs repeatedly with continued straining. If any metal that has been deformed at high temperatures by a dislocation mechanism is held at temperature after deformation, static recrystallization tends to occur with time. The effects of dynamic and static recrystallization on microstructure and on the flow stress or creep rate of the metal are considered in this paper and particular attention is given to the range of deformation conditions under which these recrystallization processes are expected to occur.