Dynamic Recrystallization During High Temperature Low Cycle Fatigue of Nickel. Progress Report, June 1, 1985-May 31, 1986

摘要

The occurrence of dynamic recrystallization in single and polycrystals under nonmonotonic loading conditions was investigated. Intermediate annealing, load inversion or changing the strain path facilitates dynamic recrystallization. Low cycle fatigue in the elastic regime has about the same effect as static recovery for the same time period. Invariably, the initiation of dynamic recrystallization is controlled by dynamic recovery, as indicated by a constant ratio sigma/sub R//sigma/sub S/. During low-cycle fatigue at 0.5 Tm with 1% plastic strain amplitude, dynamic recrystallization can be initiated at much lower stresses than in monotonic tests, but recrystallization progresses much more slowly. The static recrystallization behavior of rolled Ni sub 3 Al was investigated to establish the conditions for the occurrence of dynamic recrystallization in this material. (ERA citation 11:027615)