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Acta Metallurgica Sinica (English Letters)

, Volume 31, Issue 5, pp 465–470 | Cite as

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

  • Qingdong Liu
  • Yihua Chen
  • Chuanwei Li
  • Jianfeng Gu
Article
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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.

Keywords

High-strength low-alloy steel Thermal aging Cu-rich precipitate Atom probe tomography 
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Notes

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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Copyright information

© The Chinese Society for Metals and Springer-Verlag GmbH Germany 2017

Authors and Affiliations

  • Qingdong Liu
    • 1
    • 2
    • 3
  • Yihua Chen
    • 1
  • Chuanwei Li
    • 1
  • Jianfeng Gu
    • 1
    • 2
  1. 1.Institute of Materials Modification and Modelling, School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghaiChina
  2. 2.Collaborative Innovation Center for Advanced Ship and Deep-Sea ExplorationShanghai Jiao Tong UniversityShanghaiChina
  3. 3.Scholl of Nuclear Science and EngineeringShanghai Jiao Tong UniversityShanghaiChina

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