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Fatigue threshold studies in Fe, Fe-Si, and HSLA steel: Part II. thermally activated behavior of the effective stress intensity at threshold

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Abstract

It is shown that closure mechanisms alone cannot fully explain increasing fatigue thresholds with decreasing test temperature for a sequence of Fe-Si binary alloys and an HSLA steel. Implications are that fatigue crack propagation near threshold is a thermally activated process. The effective threshold stress intensity, which was obtained by subtracting the closure portion from the fatigue threshold, was examined. This effective stress intensity was found to correlate very well to the thermal component of the flow stress. A detailed fractographic study of the fatigue surface was performed. Water vapor in the room air was found to promote the formation of oxide and intergranular crack growth. At lower temperature, a brittle-type cyclic cleavage fatigue surface was observed but the ductile process persisted even at 123 K. Arrest marks were found on all three modes of fatigue crack growth. The regular spacings between these lines and dislocation modeling suggested that fatigue crack growth was controlled by the subcell structure near threshold. A model based on the slip-off of dislocations was examined. From this, it is shown that the effective fatigue threshold may be related to the square root of (one plus the strain rate sensitivity).

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Authors and Affiliations

  1. University of California, Berkeley, 94720, Berkeley, CA

    W. Yu (Postdoctorate with the Department of Materials Science and Mineral Engineering)

  2. Al-Fateh University, Tripoli, Libya

    K. Esaklul (Assistant Professor with the Faculty of Engineering)

  3. University of Minnesota, 151 Amundson Hall, 421 Washington Avenue S.E., 55455, Minneapolis, MN

    W. W. Gerberich (Professor and Associate Head of the Department of Chemical Engineering and Materials Science)

Authors
  1. W. Yu
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  2. K. Esaklul
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  3. W. W. Gerberich
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Formerly Research Assistant with the Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, MN.

Formerly Research Assistant with the Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, MN.

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Yu, W., Esaklul, K. & Gerberich, W.W. Fatigue threshold studies in Fe, Fe-Si, and HSLA steel: Part II. thermally activated behavior of the effective stress intensity at threshold. Metall Trans A 15, 889–900 (1984). https://doi.org/10.1007/BF02644563

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