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Transgranular crack growth in the pipeline steels exposed to near-neutral pH soil aqueous solutions: Discontinuous crack growth mechanism

机译:暴露于接近中性pH值土壤水溶液的管线钢中的沿晶裂纹扩展:不连续裂纹扩展机制

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摘要

This investigation enabled the identification of a discontinuous crack growth mechanism of pipeline steels in near-neutral pH environments, which was determined from experimental simulations lasting more than 4 months, using a novel experimental setup that had incorporated the synergistic effects of realistic mechanical loading and the changes of environments affected by coating disbonding and CO_2 level in the system. The discontinuous crack growth occurs by repeated crack dormancy-active growth cycles. Crack dormancy can be either mechanically or environmentally induced, while the active growth is initiated because of a combined effect of cyclic loading, stress concentration and hydrogen segregation and trapping.
机译:这项研究能够确定一种在近中性pH值环境下管线钢的不连续裂纹扩展机理,该机理是通过历时4个月以上的实验模拟确定的,采用了一种新颖的实验装置,该装置结合了实际机械载荷和机械载荷的协同作用。系统中涂层剥离和CO_2水平影响环境的变化。不连续的裂纹扩展是通过重复的裂纹休眠活跃的生长周期而发生的。裂纹的休眠可以是机械引起的,也可以是环境引起的,而由于循环载荷,应力集中以及氢的偏析和俘获的共同作用,开始了活跃的生长。

著录项

  • 来源
    《Corrosion science》 |2014年第6期|343-354|共12页
  • 作者单位

    Department of Chemical and Materials Engineering, University of Alberta, Edmonton T6C 2C6, Canada;

    Department of Chemical and Materials Engineering, University of Alberta, Edmonton T6C 2C6, Canada;

    Department of Chemical and Materials Engineering, University of Alberta, Edmonton T6C 2C6, Canada;

    TransCanada Pipelines Limited, Calgary, Alberta T2P 5H1,Canada;

    Spectra Energy Transmission, Vancouver, British Columbia V6E 3P3, Canada;

    TransCanada Pipelines Limited, Calgary, Alberta T2P 5H1,Canada;

    TransCanada Pipelines Limited, Calgary, Alberta T2P 5H1,Canada;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    A. Steel; C. Corrosion fatigue; C. Stress corrosion;

    机译:A.钢;C.腐蚀疲劳;C.应力腐蚀;

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