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Effect of titanium content on the refinement of coarse columnar austenite grains during the solidification of peritectic steel

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Abstract

The effect of titanium content on the refinement of austenite grain size in as-cast peritectic carbon steel was investigated by fast directional solidification experiments with simulating the solidification and growth of surface and subsurface austenite in continuously cast slabs. Transmission electron microscope (TEM) and scanning electron microscope (SEM) were used to analyze the size and distribution of Ti(C,N) precipitates during solidification. Based on these results, the pinning pressure of Ti(C,N) precipitates on the growth of coarse columnar grains (CCGs) was studied. The results show that the austenite microstructure of as-cast peritectic carbon steel is mainly composed of the regions of CCGs and fine columnar grains (FCGs). Increasing the content of titanium reduces the region and the short axis of the CCGs. When the content of titanium is 0.09wt%, there is no CCG region. Dispersed microscale particles will firstly form in the liquid, which will decrease the transition temperature from FCGs to CCGs. The chain-like nanoscale Ti(C,N) will precipitate with the decrease of the transition temperature. Furthermore, calculations shows that the refinement of the CCGs is caused by the pinning effect of Ti(C,N) precipitates.

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Acknowledgements

The present work is financially supported by the National Natural Science Foundation of China (Nos. 51774075 and 52174307), Liao Ning Revitalization Talents Program, China (No. XLYC1802032). The authors greatly appreciate their support.

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Authors and Affiliations

  1. Key Laboratory for Ecological Metallurgy of Multimetallic Mineral (Ministry of Education), Northeastern University, Shenyang, 110819, China

    Jiazhi An, Zhaozhen Cai & Miaoyong Zhu

  2. School of Metallurgy, Northeastern University, Shenyang, 110819, China

    Jiazhi An, Zhaozhen Cai & Miaoyong Zhu

Authors
  1. Jiazhi An
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  2. Zhaozhen Cai
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  3. Miaoyong Zhu
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Correspondence to Zhaozhen Cai or Miaoyong Zhu.

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An, J., Cai, Z. & Zhu, M. Effect of titanium content on the refinement of coarse columnar austenite grains during the solidification of peritectic steel. Int J Miner Metall Mater 29, 2172–2180 (2022). https://doi.org/10.1007/s12613-021-2375-2

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  • DOI: https://doi.org/10.1007/s12613-021-2375-2

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