Abstract:
Ductile cast iron is usually known as Nodular Cast Iron, Spheroidal Graphite Cast Iron and Ductile irons.
Ductile irons possess reasonably high strength, good ductility and good shock resistance. Therefore,
they can meet many design requirements for automotive applications, for example crankshaft, flywheel
drum brake, disc-brake, and gear box. The objective of this research is to study the effect of Zinc in ductile
iron castings. Zinc is one of the most important factors influencing the nodularity of the casting. The cast into
25 mm Y-blocks made from CO2 sand molds. The tensile strength, elongation, and graphite nodularity,
were also measured from the samples made from a Y block. The results of the experiment suggests
that the increasing of Zinc has effected to the visual nodularity which is significant decreased and the
distribution of graphite or the nodule count and the amount of ferrite phase are significant dropped.
The elongation significant was also significant decreased. Finally, the summation of shape, the distribution
of graphite, and the type of matrix structure, which effected from Zinc, can affect the mechanical properties of the casting.