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Hydrogen assisted ductile fracture of spheroidized carbon steels

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Abstract

The effects of hydrogen on ductile fracture were studied in two spheroidized plain carbon steels, containing 0.16 and 0.79 pct C. A combination of fractography and quantitative metallography on sectioned, deformed specimens permitted separation of the effects of hydrogen on the initiation, growth, and link-up of voids. In both steels, hydrogen was found to have no significant effect on either the initiation of voids at carbides, or early growth of voids, prior to link-up. In the higher carbon steel the fracture surface dimple size increased after hydrogen exposure with no other evident change in the fracture surface appearance; it is therefore inferred that hydrogen primarily assists void growth during link-up in this steel. In the lower carbon steel the fracture appearance changed and a decrease in void size due to hydrogen was found fractographically; thus, both initiation and growth of voids are apparently enhanced during the link-up phase of fracture in this steel. It is hypothesized that these effects may be due largely to a void pressure mechanism if hydrogen is transported by mobile dislocations.

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Authors and Affiliations

  1. Climax Molybdenum Co., 48105, Ann Arbor, MI

    R. Garber, I. M. Bernstein (Professors) & A. W. Thompson (Professors)

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  1. R. Garber
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  2. I. M. Bernstein
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  3. A. W. Thompson
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Formaly Graduate Student, Department of Metallurgy and Materials Science, Carnegie-Mellon University

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Garber, R., Bernstein, I.M. & Thompson, A.W. Hydrogen assisted ductile fracture of spheroidized carbon steels. Metall Trans A 12, 225–234 (1981). https://doi.org/10.1007/BF02655195

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