抄録
Ultrasonic and rotating bending fatigue tests were carried out for Inconel 718 in order to investigate the effect of elevated temperature on fatigue properties. In ultrasonic, fatigue strength at 500℃ was larger than that at room temperature, and many intergranular facets were observed on the fracture surface at 500℃ in addition to striations and transgranular facets which observed at room temperature. This means that there are two factors which oppose each other to fatigue strength at which elevated temperature.
