The role of silicon balls in graphitization in cast iron

What is the role of silicon balls in graphitization in cast iron:

Silicon balls are mainly used in cast iron, which plays a very important role in the formation of graphite in cast iron tissue, such as the form, quantity, and matrix tissue. Liquid cast iron contains silicon, which reduces the solubility of carbon. The higher the amount of silicon in the molten iron, the lower the carbon content, and the more carbon will be excreted. When the molten iron is a hypercontectic component, the silicon content is high, and during the solidification process, more carbon is precipitated in the form of nascent graphite, until the remaining molten iron reaches the eutectic component and the eutectic transformation occurs; When molten iron is a sub-eutectic component, silicon is enriched in nascent austenite during solidification. In gray cast iron, ductile iron, vermicular ink cast iron and black-core malleable cast iron, carbon and silicon are the main elements that affect the form and quantity of graphite. It is basically graphite-free white-core malleable cast iron, in the process of decarburization and annealing, silicon carbon diffuses in the austenite, which also plays an important role in the decarburization of this malleable cast iron. In addition, both oxygen and nitrogen in cast iron have the effect of stabilizing carbides. The silicon contained in cast iron can reduce the oxygen and nitrogen content, which indirectly enhances the effect of silicon on graphitization.

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