Production of High-Strength Ductile Cast Iron with Minimum Trace Alloy Element & without Isothermal Heat Treatment

In this investigation effect of shakout time on microstructure and mechanical properties of pearlite ductile cast iron with minimum alloying element and without Isothermal Heat Treatment had been studied. For these reason standard Y- block that designed with in-mold process used and fabricated with different chemical analysis, for control the cooling curve used the S-thermocouple (Pt-Rh) in the mold, after casting with control of cooling curve, the Y-block shakout from molds and then cooled in the air. Then standard specimens machined for mechanical and metallographic examination. The metallographic exam result showed that with increased the rate of shakout time, the pearlite in microstructure increased, also the mechanical exam result showed that with increased the rate of shakout time, hardness and tensile strength increased elongation and impact energy decreased.