The effects of dynamic strain aging (DSA) on the rotating fatigue strength of 18-8 stainless steel were investigated at ambient temperature (298K) and at 873K, respectively. The various DSA pretreatment processes were carried out at 573-873K with 5～30% prestrains. The results show that DSA pretreatment increases more effectively the room and high temperature fatigue strength of stainless steel than that of by cold-working pretreatment. The fatigue strength rises with increasing the prestrain and pretreatment temperature of DSA. The strengthening effects resulted from DSA can be reasonably explained by means of microstructure observation.
展开▼
