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Intergranular stress corrosion cracking of alloy 600 and x-750 in high-temperature deaerated water/steam

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Abstract

Intergranular stress corrosion cracking (IGSCC) has been studied in two similar nickel-base alloys, alloys 600 and X-750, in deaerated steam at elevated temperatures (380 °C). In both cases, IGSCC occurs through the nucleation, growth, and linkup of grain boundary voids rather than by grain boundary dissolution. The rate of IGSCC is much faster in both alloys when they are heat-treated so that carbon is kept in solution instead of precipitating as grain boundary carbides. This higher carbon content allows the formation of a higher methane pressure in grain boundary voids. Slip impingement on the grain boundary plays a central role in nucleating a set of voids with a spacing of about 0.2 μm. A second set of more closely spaced bubbles develops between these through the action of stress-assisted diffusion of material from the first set of bubbles.

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Authors and Affiliations

  1. Bethlehem Steel Corporation, 18016, Bethlehem, PA

    Yulin Shen (Research Engineer)

  2. Department of Materials Science and Engineering, The Ohio State University, 43210, Columbus, OH

    Paul G. Shewmon (Professor)

Authors
  1. Yulin Shen
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  2. Paul G. Shewmon
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YULIN SHEN, formerly Graduate Student, The Ohio State University

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Shen, Y., Shewmon, P.G. Intergranular stress corrosion cracking of alloy 600 and x-750 in high-temperature deaerated water/steam. Metall Trans A 22, 1857–1864 (1991). https://doi.org/10.1007/BF02646510

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  • DOI: https://doi.org/10.1007/BF02646510

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