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What are inoculants and why are they added to cast irons?

April 26, 2017added Cast inoculants Irons

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What are inoculants and why are they added to cast irons?

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Inoculants are modifiers added to white cast irons to cause the graphite to precipitate in all directions as spheroidal nodules during solidification of cast irons. Examples are magnesium and cerium. Magnesium increases the supercooling of cast iron and consequent chilling. Formation of white cast iron is avoided by double inoculation: magnesium additions make graphite nodular in shape and ferrosilicon promotes graphitization during solidification.