Abstract
The homogeneity of as-cast structures is essential to the application of advanced steel materials. The relationship between as-cast equiaxed grain structure and homogeneity was examined by means of OPA (Original Position Analysis) technology. The results indicate that macrosegregation of the solute elements was obviously suppressed in silicon steel billets with equiaxed grain structure. Furthermore, two methods to achieve an equiaxed grain structure were described. One is to use titanium-based inoculation technology. TiN particles and TiN/ Ti2O3 complex particles can precipitate at the early stage of solidification and then play an important role of heterogeneous nucleation when the solidification condition is carefully controlled. The other method is to maintain a small temperature gradient in the mould to enhance the constitutional undercooling As a result, the as-cast equiaxed grain structure was well developed in the experimental billets.
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