Abstract
Rotating bending fatigue tests of dual-phase steels having various microstructures were carried out in order to investigate the effect of microstructures on the crack growth resistance. The fatigue lives of plain specimens in dual-phase steels are nearly equal to each other under the same relative stress σa/σB, regardless of the differences in martensite morphology and grain sizes of the ferrite and the martensite at high stress levels, (where σa and σB are the nominal stress amplitude and the tensile strength of each material, respectively). This is explained from the fact that most of the fatigue life is consumed by the growth of small cracks which are controlled by the small-crack growth law, dl/dN∝σnal (l : crack length, n : constant), and the crack growth resistance is evaluated by σB of each material using this law.
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