Abstract
Rotating bending fatigue tests were carried out on the circumferential notched specimen of three kinds of carbon steel with nearly equal ferrite grain sizes of 20μm but different volume fractions of pearlite. Fatigue tests were also carried out for 0.15% carbon steel with ferrite grain size of 50μm and 0.45% carbon steel with ferrite grain size of 5μm. The effect of microstructures on the fatigue strengths σws (the limit stress for slip band), σw1 (the limit stress for macrocrack initiation), and σw2 (the limit stress for fracture) is discussed by comparing these values between three kinds of carbon steel. The main results are as follows : (1) Since σws is localized to a highly specified region, variation of Ktσws is small irrespective of notch root radius. (2) If the grain size of ferrite is nearly equal, variation of σw1 is small irrespective of pearlite volume fraction under the certain amount of pearlite. (3) In medium carbon steel, σw2 increases with increasing grain size of ferrite. (4) Notch root radius at the branch point ρo varies with the grain size of ferrite.
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