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Inclusion flotation-driven channel segregation in solidifying steels

Author

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  • Dianzhong Li

    (Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences)

  • Xing-Qiu Chen

    (Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences)

  • Paixian Fu

    (Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences)

  • Xiaoping Ma

    (Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences)

  • Hongwei Liu

    (Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences)

  • Yun Chen

    (Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences)

  • Yanfei Cao

    (Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences)

  • Yikun Luan

    (Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences)

  • Yiyi Li

    (Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences)

Abstract

Channel segregation, which is featured by the strip-like shape with compositional variation in cast materials due to density contrast-induced flow during solidification, frequently causes the severe destruction of homogeneity and some fatal damage. An investigation of its mechanism sheds light on the understanding and control of the channel segregation formation in solidifying metals, such as steels. Until now, it still remains controversial what composes the density contrasts and, to what extent, how it affects channel segregation. Here we discover a new force of inclusion flotation that drives the occurrence of channel segregation. It originates from oxide-based inclusions (Al2O3/MnS) and their sufficient volume fraction-driven flotation becomes stronger than the traditionally recognized inter-dendritic thermosolutal buoyancy, inducing the destabilization of the mushy zone and dominating the formation of channels. This study uncovers the mystery of oxygen in steels, extends the classical macro-segregation theory and highlights a significant technological breakthrough to control macrosegregation.

Suggested Citation

  • Dianzhong Li & Xing-Qiu Chen & Paixian Fu & Xiaoping Ma & Hongwei Liu & Yun Chen & Yanfei Cao & Yikun Luan & Yiyi Li, 2014. "Inclusion flotation-driven channel segregation in solidifying steels," Nature Communications, Nature, vol. 5(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:5:y:2014:i:1:d:10.1038_ncomms6572
    DOI: 10.1038/ncomms6572
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