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Nitrides Precipitation and Preferential Pitting Corrosion of Ferrite Phase in UNS S39274 Superduplex Stainless Steel

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Abstract

A W-alloyed UNS S39274 was solution treated in three distinct temperatures, 1050, 1100, and 1150 °C, with water quenching, resulting in microstructures with different austenite and ferrite proportions, and chromium nitrides precipitated. The densities of chromium nitrides were evaluated qualitatively by optical (conventional and confocal) and scanning electron microscopy. These particles were found to precipitate inside ferrite grains and in the ferrite/ferrite and ferrite/austenite boundaries. The amount of chromium nitrides increased with the solution temperature, but the microhardness of ferrite was not affected by the increase of nitrides density. As a consequence of nitrides precipitation, ferrite was more susceptible to pitting nucleation and attack than austenite, according to polarization tests in 3.5%NaCl solution at 80 °C and in double loop electrochemical potentiodynamic (DL-EPR) tests.

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Acknowledgments

Authors acknowledge to Brazilian research agencies CAPES, CNPq, and FAPERJ for financial support.

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Authors and Affiliations

  1. Universidade Federal Fluminense, Rua Passo da Pátria, 156, Niterói, RJ, CEP 24210-240, Brazil

    S. S. M. Tavares & J. M. Pardal

  2. Programa de Pós-Graduação em Engenharia Mecânica e Tecnologia de Materiais, Centro Federal de Educação Tecnológica Celso Suckow da Fonseca, Rio de Janeiro, Brazil

    S. S. M. Tavares, A. C. Gonzaga & J. M. Pardal

  3. Programa de Pós-Graduação em Materiais para Engenharia, Universidade Federal de Itajubá, Itajubá, Brazil

    J. N. Conceição & E. O. Correa

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  1. S. S. M. Tavares
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  2. A. C. Gonzaga
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  3. J. M. Pardal
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  4. J. N. Conceição
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  5. E. O. Correa
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Correspondence to S. S. M. Tavares.

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Tavares, S.S.M., Gonzaga, A.C., Pardal, J.M. et al. Nitrides Precipitation and Preferential Pitting Corrosion of Ferrite Phase in UNS S39274 Superduplex Stainless Steel. Metallogr. Microstruct. Anal. 9, 685–694 (2020). https://doi.org/10.1007/s13632-020-00685-8

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