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Analysis of χ phase precipitation in aged 2205 duplex stainless steel

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Abstract

Analysis of χ phase precipitation in 2205 duplex stainless steel aged at 700 and 750 °C has been investigated systematically. The experimental results showed that χ phase forms prior to the precipitation of σ phase and disappears once σ phase starts to precipitate. This phenomenon indicates that σ phase nucleated and consumed the χ phase. The σ phase nucleated mainly at ferrite/austenite interface and grew inwards into the ferrite phase. The morphology of σ phase reveals a coral-like structure at the temperature of 700 °C for 120 min followed by quenching in water. The decomposition of ferrite occurs via the following eutectoid reaction: F→σ+γ 2. The selected area diffraction pattern of zone axes is\([\bar 31\bar 3]_\chi ||[\bar 31\bar 3]_\delta \), indicating a characteristic orientation relationship between χ phase and δ-ferrite.

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Authors and Affiliations

  1. School of Materials Science and Engineering, North University of China, Taiyuan, 030051, China

    Heping Liu  (刘和平), Hu’er Sun, Bin Liu, Dazhao Li & Fenger Sun

  2. School of Machinery, Shanghai DianJi University, Shanghai, 200245, China

    Yongtao Zhang

Authors
  1. Heping Liu  (刘和平)
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  2. Hu’er Sun
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  3. Bin Liu
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  4. Dazhao Li
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  5. Fenger Sun
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  6. Yongtao Zhang
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Correspondence to Heping Liu  (刘和平).

Additional information

Funded by the School Foundation of North University of China, the Science and Technology Projects of Jiancaoping District of Taiyuan City, the Natural Science Foundation of Shanxi Province, China (Nos. 2013011014-1, 2015011036, 2014011024-1) and the National Natural Science Foundation of China (No. 51201154)

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Liu, H., Sun, H., Liu, B. et al. Analysis of χ phase precipitation in aged 2205 duplex stainless steel. J. Wuhan Univ. Technol.-Mat. Sci. Edit. 30, 591–595 (2015). https://doi.org/10.1007/s11595-015-1194-6

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  • DOI: https://doi.org/10.1007/s11595-015-1194-6

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