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Grain boundary segregation in austenitic stainless steels and its effect on intergranular corrosion and stress corrosion cracking

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Abstract

This paper reports a study of grain boundary segregation, intergranular corrosion, and intergranular stress corrosion cracking in austenitic stainless steels. The results show that phosphorus, nitrogen, and sulfur all segregate to grain boundaries in these materials and that they can affect one another's segregation through site compctition. In particular, the results demonstrate that phosphorus segregation can be lowered by the presence of nitrogen and sulfur in the steel. Also, if manganese is present in the steel, sulfur segregation will be greatly decreased as a result of formation of manganese sulfides. Phosphorus, sulfur, and nitrogen will not initiate intergranular corrosion in the modified Strauss test, although if corrosion is initiated by chromium depletion, these elements might enhance the corrosion process. Phosphorus segregation does enhance corrosion in the Huey test, even in steels that have not undergone grain boundary chromium depletion, although there does not appear to be a precise correlation between the depth of corrosion penetration and phosphorus segregation. Intergranular stress corrosion cracking in 288 °C water at a pH of 2.5 and electrochemical potential of OVSHE can occur in these steels even in the absence of chromium depletion if sulfur is present on the grain boundaries. Phosphorus segregation appears to have very little effect.

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Authors and Affiliations

  1. Corporate Research and Development Center, General Electric Company, P.O. Box 8, 12301, Schenectady, NY

    C. L. Briant (Staff Scientists) & P. L. Andresen (Staff Scientists)

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  1. C. L. Briant
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  2. P. L. Andresen
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Briant, C.L., Andresen, P.L. Grain boundary segregation in austenitic stainless steels and its effect on intergranular corrosion and stress corrosion cracking. Metall Trans A 19, 495–504 (1988). https://doi.org/10.1007/BF02649264

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  • DOI: https://doi.org/10.1007/BF02649264

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