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The Role of Hydrogen-Enhanced Strain-Induced Lattice Defects on Hydrogen Embrittlement Susceptibility of X80 Pipeline Steel

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Abstract

Studies to date have not completely determined the factors influencing hydrogen embrittlement of ferrite/bainite X80 pipeline steel. Hydrogen embrittlement susceptibility was evaluated based on fracture strain in tensile testing. We conducted a thermal desorption analysis to measure the amount of tracer hydrogen corresponding to that of lattice defects. Hydrogen embrittlement susceptibility and the amount of tracer hydrogen significantly increased with decreasing crosshead speed. Additionally, a significant increase in the formation of hydrogen-enhanced strain-induced lattice defects was observed immediately before the final fracture. In contrast to hydrogen-free specimens, the fracture surface of the hydrogen-charged specimens exhibited shallower dimples without nuclei, such as secondary phase particles. These findings indicate that the presence of hydrogen enhanced the formation of lattice defects, particularly just prior to the occurrence of final fracture. This in turn enhanced the formation of shallower dimples, thereby potentially causing premature fracture of X80 pipeline steel at lower crosshead speeds.

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Authors and Affiliations

  1. Graduate School of Science and Technology, Sophia University, 7-1 Kioi-cho, Chiyoda-ku, Tokyo, 102-8554, Japan

    M. Hattori

  2. Department of Engineering and Applied Sciences, Faculty of Science and Technology, Sophia University, 7-1 Kioi-cho, Chiyoda-ku, Tokyo, 102-8554, Japan

    H. Suzuki & K. Takai

  3. Earthquake Engineering and Fracture Mechanics Laboratory, Fundamental Technology Research Institute, Tokyo Gas Co., Ltd., Yokohama, 230-0045, Japan

    Y. Seko

Authors
  1. M. Hattori
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  2. H. Suzuki
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  3. Y. Seko
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  4. K. Takai
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Correspondence to K. Takai.

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Hattori, M., Suzuki, H., Seko, Y. et al. The Role of Hydrogen-Enhanced Strain-Induced Lattice Defects on Hydrogen Embrittlement Susceptibility of X80 Pipeline Steel. JOM 69, 1375–1380 (2017). https://doi.org/10.1007/s11837-017-2371-1

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  • DOI: https://doi.org/10.1007/s11837-017-2371-1

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