What is the disadvantage of nodular cast iron in excess of silicon?
Silicon has a great influence on the performance of nodular cast iron. It mainly shows that silicon can refine graphite and improve the roundness of graphite ball.
Excessive silicon control results in the formation of nodular graphite in large cross section ductile iron and reduces the mechanical properties of castings.
Therefore, the increase of silicon content in nodular iron greatly improves the strength index and reduces toughness. Ductile iron has a greater crystalline undercooling and a tendency to chill when treated by spheroidizing, and silicon reduces this tendency.
