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Effect of Aging Treatment on Impact Toughness and Corrosion Resistance of Super Duplex Stainless Steel

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Abstract

The effect of aging time on impact toughness and corrosion resistance of 25%Cr-7%Ni-2%Mo-4%W-0.2%N super duplex stainless steel from the viewpoint of intermetallic secondary phase variation was investigated with scanning electron microscopic observation with energy-dispersive x-ray spectroscopic analysis and transmission electron microscopy. The results clarified that R-phase is precipitated not only at the interface of ferrite and austenite but inside the ferrite at an initial stage of aging and then transformed into σ-phase from an aging time of 1 h, while the ferrite phase decomposed into γ2 and σ-phase with increase of aging time. This variation of the phases led to decrease of its impact toughness, and specifically, the R-phase was proved to be predominant in the degradation of the impact toughness at the initial stage of the aging. Additionally, these secondary phases led to deterioration of corrosion resistance because of Cr depletion.

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Authors and Affiliations

  1. Fusion Research and Development Directorate, Japan Atomic Energy Agency, 2-166, Oaza-Obuchi-Aza-Omotedate, Rokkasho-mura, Kamikita-gun, Aomori, 039-3212, Japan

    Jae-Hwan Kim

  2. Department of Metallurgical Engineering, Pukyong National University, San 100, Yongdang-dong, Nam-gu, Pusan, Korea

    Eun-Ji Oh & Chang-Yong Kang

  3. Department of Advanced Material Application, Ulsan Campus of Korea Polytechnics, Ulsan, Korea

    Byung-Chan Lee

Authors
  1. Jae-Hwan Kim
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  2. Eun-Ji Oh
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  3. Byung-Chan Lee
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  4. Chang-Yong Kang
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Correspondence to Chang-Yong Kang.

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Kim, JH., Oh, EJ., Lee, BC. et al. Effect of Aging Treatment on Impact Toughness and Corrosion Resistance of Super Duplex Stainless Steel. J. of Materi Eng and Perform 25, 9–14 (2016). https://doi.org/10.1007/s11665-015-1816-3

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  • DOI: https://doi.org/10.1007/s11665-015-1816-3

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