Author(s)

N. Kawagoishi, H. Nisitani & M. Goto

Abstract

Fatigue strength of ODSC at elevated temperature N. ICawagoishil, H. ~ i s i t a n i ~ & M. ~ o t o ~ I Kagoshima University, Kagoshima, Japan 2~yushu Sangyo University, Fukuoka, Japan 3 Oita University, Oita, Japan Abstract Rotating bending fatigue tests were carried out for an aluminum oxide dispersion strengthening copper alloy at room temperature and 350°C in order to investigate the fatigue strength of a notched member at elevated temperature. The results were discussed based on the influence of oxidation at elevated temperature on the crack initiation and propagation behavior. At the fatigue limit, which was defined as the limit for fracture at stress repetitions of lo7, non-propagating cracks were observed at the notch roots of sharply notched specimens at both temperatures. The morphology of the crack at room temperature was ductile, while the ones at 350°C was brittle due to surface oxidation. The fatigue limit for crack initiation at 350°C decreased by brittleness of the surface oxid

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