Influence of pouring temperature on the microstructure in ductile cast iron

摘要

It is advised to keep the melt temperature of cast iron as low as possible to avoid problems during casting. Most casting properties except mould filling is improved by keeping the temperature down. Nodule density, nodularity and ferrite increase with lower melt temperature, but this has not been quantified earlier. This paper attempts to fill this void by describing a suitable evaluation method, and using it on data from controlled experiments and foundry trials to demonstrate that nodule density increase with 0.3 -1% per °C pouring temperature decrease, while ferrite increased 0.2% per °C decrease. Nodularity increased 0.2% per °C decrease in temperature in one trial.