The Risk of Ductile Iron Post-inoculation for Heavy Section Castings

Abstract

The post–inoculation realised during the cast iron casting, is known as the one of techniques the most often used in the foundry. The aim of this operation for the cast iron with nodular graphite is the control of structure formation, including nodular graphite, and the prolongation of Mg advantageous action during the spheroidisation disappearance effect. The influence of post–inoculation on the decreasing of undercooling level during solidification and the counteraction the metastable crystallisation as well as counteraction the formation of primary carbides is known.
The hardness, mechanical strength, elongation, machinability of ductile iron is affected by the structure components such us perlite, carbides, count and shape of graphite nodules.