Effect of Titanium Addition on the Formation and Distribution of MnS Inclusions in Steel during Solidification.

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  • Oikawa Katsunari
    Tohoku National Industrial Research Institute, Ministry of International Trade and Industry
  • Ishida Kiyohito
    Department of Materials Science, Faculty of Engineering, Tohoku University
  • Nishizawa Taiji
    Department of Materials Science, Faculty of Engineering, Tohoku University

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Abstract

Effect of titanium addition on the size and dispersion of MnS inclusions in Fe-0.1C-1Mn-0.02S(mass%) base alloys has been investigated by microscopy. Titanium addition brings about a marked decrease in the size of MnS inclusions which are otherwise large and globular in Ti-free specimens. The formation mechanism of MnS inclusions is discussed on the basis of phase diagram information and thermodynamics of particle engulfment during solidification. It is shown that the reduction in size of the MnS particles consequent on Ti addition is directly the result of successive nucleation events involving (Ti, Mn)O and MnS at the solid/liquid interface of iron.

Journal

  • ISIJ International

    ISIJ International 37 (4), 332-338, 1997

    The Iron and Steel Institute of Japan

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