Cast irons are important engineering materials, which possess a wide range of attractive properties. Their properties are significantly dependent on the microstructure of the cast, cast iron components. A way of controlling the microstructure of cast iron is through the control of cooling rates during solidification. To control cooling rate mould properties are important. This paper presents the report of a study of the effects of additions of iron filings to green moulding sand on the microstructure of grey cast iron. Five sand samples were prepared with different Fe content ranging from 1 wt% to 5 wt%. A control sand sample, which had no iron content, was also prepared. The properties of the sand samples were tested and used to cast some grey cast iron samples whose microstructure were observed by optical microscopy. The results show that addition of Fe filing does not have any adverse effects on the properties of green moulding sand; however, the microstructures show a dependence on heat storage capacity of the mould.
展开▼
