Investigation of effect of remelting and crystallization features on structure of cast fast-cooled ferrosilicon inserts and lump ferrosilicon

An electron microscopic study of the structural-and-phase composition of materials for late graphitizing modification of cast iron melt in a casting bowl, namely a FS75 piece (JSC «CHEMK»), and inside a mold (in the sump under the riser), namely a cast insert, has been performed. An analysis of the shape and location of the main phases with their individual morphological features (size, casting defects, etc.) was carried out. The conclusion was made about the positive effect of re-melting ferrosilicon in the manufacture of cast inserts.