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Kinetics of Cr/Mo-rich precipitates formation for 25Cr-6.9Ni-3.8Mo-0.3N super duplex stainless steel

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Abstract

The amount and composition of Cr-rich (σ) and Mo-rich (χ) precipitates in super duplex stainless steels was analyzed. An isothermal heat treatment was conducted at temperatures ranging from 700 °C to 1000 °C for up to 10 days. A time-temperature transformation (TTT) diagram was constructed for the mixture of σ and χ phases. The mixture of the σ and χ phases exhibited the fastest rate of formation at approximately 900 °C. Minor phases, such as Cr2N, M23C6, and M7C3, were also detected using a transmission electron microscopy (TEM). Also, a continuous cooling transformation (CCT) diagram was constructed for the mixture of σ and χ phases using the Johnson-Mehl-Avrami equation. Compared with the known CCT diagram of the σ phase, this study revealed faster kinetics with an order of magnitude difference and a new CCT diagram was also developed for a mixture of σ and χ phases. The calculated fraction of σ and χ phases obtained at a cooling speed of 0.5 °C/s was in good agreement with the experimental data.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, Pusan National University, Busan, 609-735, Korea

    Sang-Ho Byun, Namhyun Kang & Kyung-Mox Cho

  2. Korea Institute of Materials Science, Changwon, 641-010, Korea

    Tae-Ho Lee

  3. POSCO Technical Research Laboratories, Stainless Steel Research Group, Pohang, 790-785, Korea

    Sang-Kon Ahn

  4. Department of Materials Science and Engineering, Dong-A University, Busan, 604-714, Korea

    Hae Woo Lee

  5. Research Institute of Industrial Science and Technology, Pohang, 790-600, Korea

    Woong-Seong Chang

Authors
  1. Sang-Ho Byun
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  2. Namhyun Kang
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  3. Tae-Ho Lee
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  4. Sang-Kon Ahn
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  5. Hae Woo Lee
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  7. Kyung-Mox Cho
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Correspondence to Namhyun Kang.

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Byun, SH., Kang, N., Lee, TH. et al. Kinetics of Cr/Mo-rich precipitates formation for 25Cr-6.9Ni-3.8Mo-0.3N super duplex stainless steel. Met. Mater. Int. 18, 201–207 (2012). https://doi.org/10.1007/s12540-012-2001-y

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  • DOI: https://doi.org/10.1007/s12540-012-2001-y

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