Non-Metallic Ti Oxides and MnS/FeS2 Complex Precipitation in Ti-Killed Steel

Titanium deoxidized experiments can be carried in vacuum induction furnace by adding Ti-Fe alloy in molten steel to simulate strip casting. Sub-rapid solidification samples were obtained in the method of suing copper mold. The morphology, the chemical composition and the structures of nanometer precipitations were carried out to investigate by transmission electron microscope (TEM) with Energy Dispersive X ray Spectrum (EDX) and by collecting diffraction patterns with carbon extraction specimens. It has been found that titanium oxides were TiO monoclinic, Ti₄O₇ anorthic and TiO₂ orthogonal structure in one nanometer inclusion, as the composite oxide was precipitated MnS/FeS₂ cubic structure during sub-rapid solidification. Thermodynamic calculation analysis showed that it was possible to precipitate different kinds of nonstoichiometric TiOx. The solid solution between MnS/FeS₂ will precipitate on the surface of titanium oxides because of good coherency relationship.