Influence of Oxygen Content on the Inclusion Formation and Pitting Corrosion Resistance of Hyper Duplex Stainless Steels

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  • Jeon Soon-Hyeok
    Department of Material Science and Engineering, Yonsei University Nuclear Materials Safety Research Division, Korea Atomic Energy Research Institute
  • Hur Do Haeng
    Nuclear Materials Safety Research Division, Korea Atomic Energy Research Institute
  • Kim Hye-Jin
    Department of Material Science and Engineering, Yonsei University
  • Park Yong-Soo
    Department of Material Science and Engineering, Yonsei University

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Description

To determine the influence of oxygen content on the formation of inclusion in 27Cr-7Ni hyper duplex stainless steel, samples were analyzed by scanning electron microscopy. Electrochemical tests were also conducted, which revealed that an increase in oxygen content reduces the resistance to pitting corrosion of the alloys. This was attributed to the formation of numerous inclusions, as well as an increase in the area of micro-crevices that occur between the inclusion and metallic matrix, and which act as initiation sites for corrosion pits.

Journal

  • MATERIALS TRANSACTIONS

    MATERIALS TRANSACTIONS 55 (12), 1872-1877, 2014

    The Japan Institute of Metals and Materials

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