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Formation of Equiaxed Crystals by Complex Inclusions during Solidification of Advanced High Strength Steel

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Proceedings of the 8th Pacific Rim International Congress on Advanced Materials and Processing

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Abstract

The effect of Mg-Ti deoxidation on the solidification structure of advanced high strength steel was investigated by observing not only the solidification structure but also the inclusion particles using SEM-EDS. The effect of precipitation of TiN, MgO and ‘TiN-MgO’ on the formation of fine equiaxed crystals was evaluated. The composition of inclusions was changed as in the order of MgO ➔ ‘MgO(core)+TiN(surface)’ ➔ Ti2O3 by reaction time, which corresponds to the change of solidification structure as ‘columnar ➔ equiaxed ➔ columnar.’ This could be understood from the concept of lattice disregistry in between delta iron and MgO (3.97%), TiN (3.91%), and Ti2O3 (18.9%). However, even with very low disregistry between delta iron and MgO, the MgO itself did not work as an effective catalyst, indicating that there is another criterion for determining a good catalyst. The mechanism of the formation of TiN on MgO surface was schematically described. The precipitation of TiN on MgO surface was feasible although the content of Ti and N was lower than the equilibrium solubility product for the formation of TiN. Because disregistry between TiN and MgO is very low (0.05%), the precipitation of TiN on the surface of MgO is energetically more favorable.

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Authors and Affiliations

  1. Department of Materials Engineering, Hanyang University, Ansan, 426-791, Korea

    Joo Hyun Park & Jun Seok Park

  2. Department of Materials Science and Engineering, Hanyang University, Seoul, 133-791, Korea

    Changhee Lee

Authors
  1. Joo Hyun Park
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  2. Jun Seok Park
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  3. Changhee Lee
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Editor information

Editors and Affiliations

  1. Department of Systems Engineering, Naval Post-graduate School in Monterey, California, USA

    Fernand Marquis (Research professor) (Research professor)

  2. Wayne E. Meyer Institute of Systems Engineering, Naval Post-graduate School in Monterey, California, USA

    Fernand Marquis (Research professor) (Research professor)

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© 2013 TMS (The Minerals, Metals & Materials Society)

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Park, J.H., Park, J.S., Lee, C. (2013). Formation of Equiaxed Crystals by Complex Inclusions during Solidification of Advanced High Strength Steel. In: Marquis, F. (eds) Proceedings of the 8th Pacific Rim International Congress on Advanced Materials and Processing. Springer, Cham. https://doi.org/10.1007/978-3-319-48764-9_82

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