Effects of Rare Earth Elements and Manganese Addition on Graphitization and Mechanical Properties in Flake Graphite Cast Iron

摘要

In this study, the effect's of rare earth elements (RE) and manganese (Mn) addition on the chilling tendencies and mechanical properties of flake graphite cast iron containing 0.08 percent sulfur (S) were investigated. RE and Mn reacted with S in the melt and the resulting complex sulfide. helped to nucleate the flake graphite. which led to notable graphitization. The addition of the corresponding stoichiometric amount of RE in relation to the amount of S in the melt containing up to 2 percent Mn was found to refine the pearlite lamellar spacing. improve the shape of graphite and enhance the mechanical properties. In flake graphite cast iron containing 2.0 percent Mn with 0.2 percent RE, the relatively high tensile strength of 300 MPa or more was obtained without chill.