Abstract
Commercial base pure iron plate specimens were tested under reversed and pulsating axial stresses in a high cycle fatigue range. The crack nucleation sites and the subsequent growth paths of cracks were analyzed in terms of the crystallographic orientation of grains surrounding the cracks. It was observed that fatigue cracks nucleated at grain boundaries under completely reversed stress, but under pulsating tension with enhanced maximum stress, cracks emerged along persistent slip bands well developed on the specimen surface. Crack growth from the surface toward the inside was observed to occur in the shear mode along one or two dominating slip systems in the same manner as the pencil glide, irrespective of the stress patterns.
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