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Effects of pre-precipitation of Cr2N on microstructures and properties of high nitrogen stainless steel

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Abstract

Aging precipitation and solid solution heat treatment were carried out on three steels which have chromium content of 18%, manganese content of 12%, 15%, 18%, and nitrogen content of 0.43%, 0.53%, 0.67%, respectively. The mechanisms of precipitation and solid solution of high nitrogen austenitic stainless steel were studied using the scanning electron microscopy, transmission electron microscopy, electron probe micro analysis and mechanical testing. The results show that, Cr2N is the primary precipitate in the tested stainless steels instead of Cr23C6. Cr2N nucleates at austenitic grain boundaries and grows towards inner grains with a lamellar morphology. By means of pre-precipitation of Cr2N at 800 °C, the microstructure of the steels at solid solution state can be refined, thus improving the strength and plasticity. After the proposed treatment, the tensile strength, the proof strength and the elongation of the tested steel reach 881 MPa, 542 MPa and 54%, respectively.

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Authors and Affiliations

  1. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing, 100083, China

    Jing-yuan Li  (李静媛)

  2. Materials Science and Engineering Program, University of California, Riverside, 92521, USA

    Hui-nan Liu  (刘慧男)

  3. School of Metallurgical Engineering, Hunan University of Technology, Zhuzhou, 412007, China

    Pei-wu Huang  (黄佩武)

Authors
  1. Jing-yuan Li  (李静媛)
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  2. Hui-nan Liu  (刘慧男)
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  3. Pei-wu Huang  (黄佩武)
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Corresponding author

Correspondence to Jing-yuan Li  (李静媛).

Additional information

Foundation item: Project(50974014) supported by the National Natural Science Foundation of China

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Li, Jy., Liu, Hn. & Huang, Pw. Effects of pre-precipitation of Cr2N on microstructures and properties of high nitrogen stainless steel. J. Cent. South Univ. Technol. 19, 1189–1195 (2012). https://doi.org/10.1007/s11771-012-1127-x

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  • DOI: https://doi.org/10.1007/s11771-012-1127-x

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