EFFECT OF DIRECT IN-MOULD INOCULATION ON THE STRUCTURE OF IRON ALLOYS

In the course of the executed project, a series of investigations has been made to establish what effect a refined inoculant applied on the mould surface can have on changes in the surface structure of castings made from ductile iron and alloyed cast steel. During preliminary research it was decided to use a cheap and readily available FeSi75T inoculant for cast iron, while for the austenitic SUS316 (LH17N17M3) cast steel, a FeNbC inoculant after special melting and treatment was selected. The inoculation process consisted in dissolving the applied layer of inoculant, thus requiring the choice of a best amount of the inoculant of proper granulation to induce the inoculation process along with all the expected effects, i.e. raising the number of graphite precipitates in cast iron combined with their refinement, and grain refinement in cast steel.

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