Can any one tell me which particle is being found in flakes form in cast house in detail?

C as Graphite is in the Cast iron(except White cast iron). The Fe3C dissociates into Fe + C(graphite) during the cast iron forming process.due to higher C content in cast iron and temperature support the Fe3C which is a metastable phase dissociates.  Many elements like Sulphur favours this process. This graphit gives Cast iron its unique property.