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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M. Dollar, I. M. Bernstein, and A. W. Thompson:Acta Metall., in press.
M. A. Daeubler, A. W. Thompson, and I. M. Bernstein:Metall. Trans. A, in press.
J. M. Hyzak and I. M. Bernstein:Metall. Trans. A, 1976, vol. 7A, pp. 1217–24.
J. W. Edington:Practical Electron Microscopy in Materials Science, Van Nostrand Reinhold Co., New York, NY, 1976.
M. A. Meyers and E. Ashworth:Phil. Mag., 1982, vol. 46, pp. 737–59.
J. P. Hirth:Metall. Trans., 1972, vol. 3, pp. 3047–67.
F. Lazslo and H. Nolle:J. Mech. Phys. Solids, 1959, vol. 7, pp. 193–97.
M. J. McGregor Tegart:Elements of Mechanical Metallurgy, New York, NY, 1966.
N. J. Petch:Acta Cryst., 1953, vol. 6, pp. 96–97.
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Dollar, M., Bernstein, I.M., Daeubler, M. et al. The effect of cyclic loading on the dislocation structure of fully pearlitic steel. Metall Trans A 20, 447–451 (1989). https://doi.org/10.1007/BF02653924
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DOI: https://doi.org/10.1007/BF02653924