Abstract
The fatigue behavior and associated crack inititation of pearlite has been correlated with developing dislocation configurations in a cyclically deformed fully pearlitic steel. Under fatigue conditions at low stress amplitudes, dislocations are found to be generated and largely confined to the cementite/ferrite interfaces, most likely due to the development of elastic incompatibility stresses between the cementite and ferrite. This deformation mode encourages fatigue crack initiation parallel to the cementite lamellae. The fatigue limit of pearlite appears not to be influenced by the interlamellar spacing, a result basically different from that found in monotonic deformation where yielding and flow are strongly affected by the spacing. The apparent differences are discussed in terms of the different dislocation configurations formed during monotonic and cyclic deformation.
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