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Hydrogen-controlled cracking—An approach to threshold stress intensity

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Abstract

Threshold stress intensities, KTH, below which no cracking will occur under stress-corrosion cracking or hydrogen-assisted cracking conditions, are discussed. A quantitative correlation, which suggests why KTH may exist, is evolved. The controlling mechanism is proposed to be a critical concentration of hydrogen, its propensity to form being governed by yield strength, initial concentration, state of stress and temperature variables. The general trends of all variables are reviewed for high strength AISI 4340, maraging and 9 Ni4 Co steels. Specifically it is proposed that Kapplied=KTHCeq=Ccr which means that the applied stress intensity equals the threshold when the equilibrium concentration of hydrogen at the crack tip just achieves the critical concentration. Based upon this concept, correlations are derived for elastic, plane-strain plastic and plane-stress plastic conditions.

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Authors and Affiliations

  1. Department of Chemical Engineering and Materials Science, University of Minnesota, 55455, Minneapolis, Minnesota

    W. W. Gerberich (Associate Professor, Director of Materials Science) & Y. T. Chen (Graduate Student)

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  1. W. W. Gerberich
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  2. Y. T. Chen
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Additional information

This present paper is based on a portion of the thesis submitted by Y. T. Chen in partial fulfillment of the requrirement for the M.S.degeee at the University of Minnesota.

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Gerberich, W.W., Chen, Y.T. Hydrogen-controlled cracking—An approach to threshold stress intensity. Metall Trans A 6, 271 (1975). https://doi.org/10.1007/BF02667281

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  • DOI: https://doi.org/10.1007/BF02667281

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