The notched fatigue strength of nickel-base superalloy Inconel 718 has been
investigated under rotating bending loading at room temperature and 500 de
grees C in air. The applicability of linear notch mechanics to the evaluati
on of notched fatigue strength at elevated temperature was assessed in term
s of the fatigue limit for crack initiation and that for crack growth. The
effect of temperature on the fatigue strength and notch sensitivity of Inco
nel 718 was examined. The results were discussed from the viewpoints of the
softening of matrix and surface oxidation at elevated temperature. (C) 199
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