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Effects of grain-boundary segregation and precipitation on the hydrogen susceptibility of nickel

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Abstract

The straining electrode tensile test was employed to study hydrogen embrittlement in three grades of nickel. Aging at intermediate temperatures (400 to 800 °C) after solution annealing caused sulfur segregation to grain boundaries in the materials. This sulfur segregation was found to influence intergranular hydrogen embrittlement, and the effect was most prominent when the surface supply of hydrogen was low and when the grain boundaries were free of graphite precipitates. Aging also induced graphite precipitation at the grain boundaries of one grade of nickel (Nickel 200). The presence of these grain-boundary particles reduced susceptibility to hydrogen embrittlement, but at the same time caused a form of aging embrittlement. The effect of the second-phase precipitate, when present, masked the effect of sulfur segregation on hydrogen susceptibility.

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Authors and Affiliations

  1. Northern Telecom, Ottawa, ON, Canada

    T. S. F. Lee

  2. Department of Materials Science and Engineering, Massachusetts Institute of Technology, 02139, Cambridge, MA

    R. M. Latanision (Professor)

Authors
  1. T. S. F. Lee
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  2. R. M. Latanision
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Formerly with Bell-Northern Research, Ottawa, ON, Canada.

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Lee, T.S.F., Latanision, R.M. Effects of grain-boundary segregation and precipitation on the hydrogen susceptibility of nickel. Metall Trans A 18, 1653–1662 (1987). https://doi.org/10.1007/BF02646149

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  • DOI: https://doi.org/10.1007/BF02646149

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