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Investigation of deformation field and hydrogen partition around crack tip in fcc single crystal

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Abstract

In situ fracture experiments and measurements of the hydrogen distribution in the immediate vicinity of the crack tip were used to investigate the effects of hydrogen on a face-centered cubic (fcc) single-crystal fracture process. The techniques used were scanning electron microscopy (SEM), a scribed-grid method with a computer-controlled data acquisition system, and ion microprobe mass analysis (IMMA). It was observed that the general features of plastic deformation are similar in both charged and uncharged hydrogen samples under mixed-mode loading conditions, and in both cases the strain field ahead of the crack tip is best expressed by an exponential equation. There are also differences. Hydrogen easily enlarges the crack tip opening displacement (CTOD) under a lower threshold stress-intensity factor, inhomogeneously increases the localized plastic deformation, and markedly enhances the steepness of strain curve near the crack tip. Internal hydrogen increases plasticity in the immediate vicinity of the crack tip but its effective range is smaller when compared with external hydrogen effects. The results show that two peaks of hydrogen concentration appear ahead of the crack tip: one peak is in the immediate vicinity of the crack tip and another peak is located some distance from the crack tip. It is concluded that the distribution of dissolved hydrogen with two peaks around the crack tip corresponds to the distribution of strain and stress fields, respectively, due to the interaction of hydrogen with dislocation and hydrostatic stress.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Toyama University, Japan

    Shuming Sun (Visiting Researcher,Associate Professor)

  2. Department of Mechanical Engineering II, South China University of Technology, 510641, Guangzhou, People’s Republic of China

    Shuming Sun (Visiting Researcher,Associate Professor)

  3. Department of Mechanical Engineering, Faculty of Engineering, Toyama University, 930, Toyama, Japan

    Kazuaki Shiozawa (Professor)

  4. Department of Materials Science and Technology, Tsinghua University, 100084, Beijing, People’s Republic of China

    Jialin Gu (Associate Professor) & Nanping Chen (Professor)

Authors
  1. Shuming Sun
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  2. Kazuaki Shiozawa
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  3. Jialin Gu
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  4. Nanping Chen
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Sun, S., Shiozawa, K., Gu, J. et al. Investigation of deformation field and hydrogen partition around crack tip in fcc single crystal. Metall Mater Trans A 26, 731–739 (1995). https://doi.org/10.1007/BF02663922

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  • DOI: https://doi.org/10.1007/BF02663922

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