Fatigue Strength Of ODSC At Elevated Temperature
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
Keywords
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