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An investigation of environmental effects on fatigue crack growth in Q1N (HY80) steel

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Abstract

Fatigue threshold tests have been conducted on through-thickness and semielliptic cracks in laboratory air, vacuum, and salt water at stress ratios(R = Kmin/Kmax @#@) of 0.2 and 0.7. The effects of stress ratio are rationalized by crack closure concepts. Environmental effects are explained by considerations of the irreversibility of slip at the crack tip and the role of debris on the fracture surfaces. Differences in the fatigue crack growth rates in the three environments are attributed largely to the extent of the irreversibility of slip due to the chemisorption of water/ water vapor at the crack tip. Debris in saltwater solutions is also shown to significantly affect the near-threshold growth through its influence on crack closure and the transportation of environment to the crack tip.

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Authors and Affiliations

  1. McDonnell Douglas Research Laboratories, 63166, St. Louis, MO

    W. O. Soboyejo (Research Scientist in Fatigue and Fracture)

  2. Department of Physical Metallurgy and Materials Science, University of Birmingham, B15 2TT, Birmingham, UK

    J. F. Knott (Professor and Department Head)

Authors
  1. W. O. Soboyejo
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  2. J. F. Knott
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formerly Graduate Student, Department of Materials Science and Technology, Cambridge University

formerly with the Department of Materials Science and Metallurgy, Cambridge University

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Soboyejo, W.O., Knott, J.F. An investigation of environmental effects on fatigue crack growth in Q1N (HY80) steel. Metall Trans A 21, 2977–2983 (1990). https://doi.org/10.1007/BF02647218

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  • DOI: https://doi.org/10.1007/BF02647218

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