Notice of Retraction: Load frequency effect on gigacycle fatigue properties of superalloy inconel 718

Abstract

Fatigue behaviors of the superalloy inconel 718 under gigacycle regime with load frequencies of 52.5 Hz and 20 kHz were investigated in this paper. The results indicated that there are gigacycle fatigue failure behaviors for this material. On the one hand, some specimens were submitted to conventional rotating bending experiments with a frequency of 52.5 Hz. On the other hand some were submitted to 20 kHz ultrasonic loading experiments. Apparently, different S-N curves could be observed for both experiments. The fracture photographs through SEM were compared and the effects of the frequency on the fracture mechanism were analyzed.