OS2119 Ultra-high-cycle Fatigue Evaluation of 800MPa Grade High Strength Steels

Abstract

The giga − cycle fatigue properties of high − strength steel are impO伽 t to maintain and manage the equipment ， In the present study ， the rotating bending test and the ultrasonjc loading test up to lO8 cycles are carTied out using the 800MPa grade high strength steels in order to clarify the giga − cycle 跏 gue of high − s廿ength steel ． One of the several specimens failed due to internal fbcture over 107 cycles in the ultrasonlc loading test It was clarified the origin of fiacture on specimen which fail ◎ d over lO7 cycles is inclusions ， which has large profile a 【eeg by 丘actography ， Key Orord ：Giga − cycle Fatigue ， Rotating Bend ｛ ng Fatigue Testing ， Ultrasonic fatigue Testing ， Fractography