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Fatigue crack initiation and strain-controlled fatigue of some high strength low alloy steels

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Abstract

Initiation and growth of fatigue microcracks were investigated in several Nb and V alloyed high strength low alloy steels, including conventional and dual phase microstructures. Fatigue microcracks initiated along prominent slip bands. Macrocracks formed by linking up of small microcracks. At low applied stress or strain, the number of cycles to crack initiation increased with the cyclic yield stress. Comparing the cyclic stress-strain curves to the monotonie stress-strain curves, cyclic hardening or softening occurred, depending upon strain amplitude. Plateau regions were observed in plots of cyclic stress amplitudevs cyclic plastic strain amplitude obtained by increasing the total strain amplitude in steps after 30 cycles at each step. In polycrystalline 0.03 pct Nb steel, the plateau region was identified with prominent slip band formation, as others have observed in single crystals of copper, C-doped iron, and other metals.

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Authors and Affiliations

  1. General Dynamics, 76101, Ft. Worth, TX

    Y. H. Kim (Senior Research Scientist)

  2. Northwestern University, 60201, Evanston, IL

    M. E. Fine (W. P. Murphy Professor of Materials Science and Engineering)

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  1. Y. H. Kim
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  2. M. E. Fine
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Kim, Y.H., Fine, M.E. Fatigue crack initiation and strain-controlled fatigue of some high strength low alloy steels. Metall Trans A 13, 59–72 (1982). https://doi.org/10.1007/BF02642416

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