Peculiarity of Producing Ferritic Ductile Iron Castings

Abstract

In the present investigation, the effects of charge materials, melting conditions, section size, spheroidizing and inoculation methods on the chemical composition of melt and the matrix microstructure of ductile iron castings have been investigated. Results showed that the increase of temperature and holding duration of the melt in an induction furnace decrease the carbon content and increase the silicon content. The intensity of spheroidizing effects on the carbon and residual magnesium contents in the ductile iron castings. This investigation has shown that the castings of ductile iron will be ferritic as-cast only when large amount of pig iron in the charge are used. However, the producing as-cast ferritic thin-section ductile iron castings needs in addition some-steps inoculating treatment.