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Effect of several complex inoculants on mechanical properties, process-ability and sensibility of grey cast iron used in cylinder block were investigated. The experimental results showed that the grey cast iron treated with 60%FeSi75+40%RE complex inoculants has tensile strength consistently at about 295 MPa along with good hardness and improved metallurgy quality. While the grey cast iron inoculated with 20%FeSi75+80%Sr compound inoculants has the best process-ability, the lowest cross-section sensibility and the least microhardness difference. The wear amount of the drill increases correspondingly with the increase of the microhardness difference of matrix structure, indicating the great effect of homogeneousness of matrix structure in the grey cast iron on the machinability of the grey cast iron.
Effect of several complex inoculants on mechanical properties, process-ability and sensibility of gray cast iron used in cylinder block investigated. The experimental results showed that the gray cast iron treated with 60% FeSi75 + 40% RE complex inoculants had tensile strength consistently at While the gray cast iron inoculated with 20% FeSi75 + 80% Sr compound inoculants has the best process-ability, the lowest cross-section sensibility and the least microhardness difference. The wear amount of 295 MPa along with good hardness and improved metallurgy quality. of the drill increases correspondingly with the increase of the microhardness difference of matrix structure, indicating indicating great effect of homogeneousness of matrix structure in the gray cast iron on the machinability of the gray cast iron.