Abstract:
This paper aims to study the effect of titanium addition on the microstructure and mechanical properties of ductile cast iron. The main issue is the reduction in graphite nodularity, which leads to mechanical properties falling below customer specifications. Ductile cast iron castings were produced using an induction furnace. The carbon and silicon content were adjusted, and titanium added in the form of a Fe-Ti alloy was introduced into the pouring ladle, thoroughly stirred and then poured into CO₂ molds. Samples for microstructure observation were examined using an optical microscope and graphite morphology was analyzed through image analysis. The results indicated that titanium addition in the range of 0.1510.210% significantly reduced graphite nodularity to below 80%. The presence of deleterious nodules or grab graphite had a considerable negative effect on the microstructure, which also resulted in a decrease in ductility. In conclusion, the addition of titanium within this range adversely affects the graphite morphology and mechanical properties, making it unsuitable for meeting industrial specifications