This paper is concerned with the investigation of the effect of magnesium to sulfur ratio on the graphite morphology and estimation of the ranges of this ratio use to produce graphite cast iron at different section sections. The main factors affecting shape of graphite cast iron are the metallurgical structures and the section thicknesses. Cast iron of different shapes of graphite particles directly affect its thermo-mechanical properties. The nodular shape of these graphite particles such as in ductile cast iron improve its mechanical properties, on the other hand, when the shape of these graphite particles become elongated such as in flake graphite cast iron results in improving its thermal conductivity. In between, the worm-like shape of these graphite particles such as in compacted graphite cast iron, make this type of cast iron to have thermo-mechanical properties in between those of ductile and flake graphite cast iron. The different types of ductile , compacted and flake graphite cast iron were produced by means of plunger method at different section thicknesses and the effect of Mg/S ratio on these types of graphite particles was investigated and its range was established.
A direct resistance measurement method using two point probes has been used to measure the electrical resistance of ductile graphite cast iron produced at different thickness sections and over a wide range of temperatures. The thermal conductivity of this type of cast iron was estimated using the Wiwedemen-Franze -Loranze Law. It was found that smaller section thickness has lower thermal conductivity than medium and larger thicknesses. This is due to the formation of compacted and degenerated ductile cast iron at higher section thicknesses.
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