Change in Surface States and Incipient Fatigue Cracks in Electro-Polished Low Carbon Steel (Plain and Notched Specimens) under Rotating Bending Stress

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Using electro-polished low carbon steel specimens, the change in surface states and the incipient fatigue cracks of plain and notched specimens subjected to rotating bending stress were investigated. The main results obtained are as follows. (1) When the limit stress for macro-crack initiation σ_<w1> is repeated, the amount of slip bands appearing at the root of notch is nearly equal, not only after 10^7 cycles but also at every cycle ratio, even if the maximum stress ασ_<w1> at the bottom of notch is different in various radii of the notches. (2) In the specimens with various radii of the notches, the limit stress for slip bands initiation σ_<ws> is almost proportional to the stress σ_<w1>, that is, σ_<ws>≌(0.85〜0.9)σ_<w1>. (3) The incipient fatigue cracks, which appear on plain specimens after 10^7 cycles of the stress σ_<w1>, can hardly sustain the tensile stress statically and dynamically.
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