Abstract
AbstractThis paper emphasizes the important effect of Kt and corrosive environment on internal fatigue crack initiation of structural materials in very high cycle regime. The conventional and ultrasonic fatigue testing results on notched specimens with Kt of 1.5 to 2.5 for YXR3 steel with HRC 60.7 showed subsurface fatigue crack initiation on all notched specimens at Nf higher than 106. On the contrary, fatigue crack initiated at notched surface for HAP72 with HRC 67 with Kt of 2.0. The fatigue crack initiation mode in notched specimens at high cycle regime is governed by surface hardness of high strength steels. The contrasting effect of refrigeration compressor gaseous environment on fatigue crack initiation mode is also demonstrated in the plate bending fatigue testing results of 1% carbon steel.
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