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On the Role of Ni in Cu Precipitation in Multicomponent Steels

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Abstract

The nature of Cu precipitation in quench-tempered multicomponent high-strength low-alloy steels is characterized by atom probe tomography. The detected nanometer sized Ni-rich clusters act as preferential nucleation sites for Cu-rich clusters, and Ni segregation at the Cu-rich precipitate/matrix heterophase interface contribute to fast growth of Cu precipitates. Molecular dynamics simulation indicates that local Ni clustering at atomic scale significantly quickens the solute diffusion. The initial Ni composition has a profound effect on the nature of Cu precipitation.

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This work was financially supported by the National Basic Research Program of China under Grant No. 2011CB012904 and the National Natural Science Foundation of China under Grant No. 50931003. Many thanks for the help of Wenxiong Song at Shanghai University in molecular dynamics simulation.

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Authors and Affiliations

  1. Shanghai Key Laboratory of Materials Laser Processing and Modification, School of Materials Science and Engineering, Shanghai Jiaotong University, Shanghai, 200240, P.R. China

    Qingdong Liu (Postdoctoral Candidate) & Jianfeng Gu (Professor)

  2. Laboratory for Microstructures and Institute of Materials, School of Materials Science and Engineering, Shanghai University, Shanghai, 200444, P.R. China

    Wenqing Liu (Professor)

Authors
  1. Qingdong Liu
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  2. Jianfeng Gu
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  3. Wenqing Liu
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Correspondence to Jianfeng Gu.

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Manuscript submitted May 7, 2013.

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Liu, Q., Gu, J. & Liu, W. On the Role of Ni in Cu Precipitation in Multicomponent Steels. Metall Mater Trans A 44, 4434–4439 (2013). https://doi.org/10.1007/s11661-013-1933-2

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  • DOI: https://doi.org/10.1007/s11661-013-1933-2

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