Abstract
Efect of stress ratio on fatigue properties was investigated for Ni base super alloy 718 forging. Fatigue tests were conducted under stress ratios of R = -1, 0.01, 0.5 and under the condition fixing the maximum stress at 0.2% proof stress (6,,, =Co2 test). The internal fracture occurred in all test condition. The fracture sites of the internal fracture revealed the carbide inclusion and several facets. The fatigue limits determined at 107 cycles were below a modified Goodman line under R=0.01, although they were above under around R=0.5 and 0.7.
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