Kinetics of Nucleation of Graphite at different Stages of Solidification for Spheroidal Graphite Iron

摘要

The importance of the nucleation and growth phenomena that control the solidification of castings on the mechanical properties and soundness of cast iron cannot be overemphasized. The graphite nucleation mechanism is directly related to the carbon content of the iron and the inoculation treatment. Over the years, a multitude of theories have been developed with the objective to explain the nucleation process of spheroidal graphite (SG) iron. The most important include the gas bubble theory, the graphite or carbon rich cluster theory, the salt-like carbide theory, the silicon carbide theory, the sulphide/oxide theory, the silicate theory .