Presented research focused on high silicon cast iron with 19% silicon content. The studies were conducted in two steps. In the first step the crystallization process analysis using TDA method was executed, metallographic examination on optical microscope was made and calculations in Thermo – Calc were performed. Two different intermetallic phases were noticed in cast alloy: Fe5Si3 and probably Fe2Si. In the second step the EDS analysis on scanning electron microscope was conducted, which has proven the occurrence of primary Fe2Si precipitation. These phases significantly affect the quality of high silicon cast iron.Keywords: Intermetallic phases, silicon cast iron
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