Abstract
Fatigue specimens of SNCM439 steel tempered at 160deg.C and 180deg.C were prepared and fatigue tests in gigacycle regime were performed in rotating bending. These steels tempered at both temperatures indicated significant dual S-N characteristics consisting of S-N curves for surface-induced fracture and interior inclusion-induced fracture. In the case of interior inclusion-induced fracture, fish-eye pattern can be observed depending on the depth of the inclusion played a role as the crack starter. Fine granular area(FGA) was found around the inclusion as the crack starter and the SIF range at FGA front was almost constant.
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