Method and apparatus for predicting microstructure of cast iron

摘要

A method and apparatus for predicting nodularity of a hypo or hyper eutectic cast iron melt during casting is described. The method is particularly useful for NiMg-treated melts but can also be used for rare earth treated melts. A small sample of the melt is poured into a sample cup to which up to 0.025% wt bismuth is added and a cooling curve is produced during cooling. In a NiMg treated melt, a (Delta)T (TER-TEU) of at least 9 degrees C. indicates good nodularity. In an RE treated melt, a (Delta)T of less than 6 degrees C. at a TER/TEU of 1140 degrees C. also indicates good nodularity will be observed upon the solidification of the melt.