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Compositional Variants of Cu-rich Precipitate in Thermally Aged Ferritic Steel

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Acta Metallurgica Sinica (English Letters) Aims and scope

Abstract

Atom probe tomography was utilized to investigate Cu precipitation in a high-strength low-alloy steel isothermally aged at 500 °C for 1, 4, 16, and 64 h after water-quenching from 900 °C. With prolonged aging time, the Cu-rich precipitates (CRPs) increased in size and decreased in number density, and gradually evolved from spheroidal to elliptical in morphology. The small CRPs were rich in a high amount of Fe and a certain amount of Ni and Mn at their early nucleation stage. The large CRPs with increased size due to extensive aging contained less Fe and more Cu at their later growth stage. Additionally, Ni and Mn were both readily to segregate at the CRP/matrix heterophase interfaces, and Mn was higher in content than Ni in the precipitate interior especially when the CRPs were large in size.

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Acknowledgements

One of the authors, Qingdong Liu, thanks to Mrs Qifeng Zeng at Shanghai Nuclear Engineering and Research & Design Institute, China, for her great support to this research.

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Authors and Affiliations

  1. Institute of Materials Modification and Modelling, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China

    Qingdong Liu, Yihua Chen, Chuanwei Li & Jianfeng Gu

  2. Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration, Shanghai Jiao Tong University, Shanghai, 200240, China

    Qingdong Liu & Jianfeng Gu

  3. Scholl of Nuclear Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China

    Qingdong Liu

Authors
  1. Qingdong Liu
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  2. Yihua Chen
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  3. Chuanwei Li
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  4. Jianfeng Gu
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Correspondence to Jianfeng Gu.

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Liu, Q., Chen, Y., Li, C. et al. Compositional Variants of Cu-rich Precipitate in Thermally Aged Ferritic Steel. Acta Metall. Sin. (Engl. Lett.) 31, 465–470 (2018). https://doi.org/10.1007/s40195-017-0661-9

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  • DOI: https://doi.org/10.1007/s40195-017-0661-9

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