Abstract
Round EP741NP heat-resistant alloy specimens were tested in the range of fatigue life between 10 5 and 10 8 cycles under cyclic tension with heating of the surroundings to 650 °C. It is shown that fracture of the specimens begins with subsurface fracture nucleation from a cluster of inclusions or a formed smooth facet. Further, the process develops along slip planes with intense oxidation of the fracture, whereupon a self-organized discrete transition to fracture in the range of low-cycle fatigue occurs with the formation of fatigue striations and less intense oxidation of the fracture. The proposed model of crack opening in modes III and I during the facet formation and subsequent fracture along slip planes allows explaining the observed mechanisms of fracture and oxidation beneath the material surface.
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