The development of spheroidal graphite in low Mn/S ratio white cast irons has been studied. The effects of chemical composition of the iron (including manganese, sulfur and silicon contents) , and first stage heat treating temperatures and times on the shape, size, nodule count and distribution of graphite was opserved. The formation of three types of graphite - spheroidal, compact and aggregated, was considered. The authors found that spheroidal graphite was always found in contact with sulfides, and was restricted in growth rate in the same manner as spheroidal graphite formation during solidification. The importance of incubation times for graphite formation was discussed along with the effect of nodule number.
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