On-line prediction of carbon equivalent on high-nickel austenitic ductile iron

In this paper, experiments have been made on high-nickel ductile iron for controlling the property by the computer-aided thermal analysis system. The experimental results have been analyzed with statistics and applied to on-line predicting and controlling carbon equivalent, which obtained satisfying result. The experiments show that the relationship between the carbon equivalent of high-nickel ductile iron and its liquidus temperature is linear, which can be expressed as: CEL = 15.7826 − 0.0096575 × TL. In order to ensure the tensile strength greater than 400 MPa with the probability up to 99%, the liquidus temperature of high-nickel austenitic ductile iron must be in the range of [1203–1226 °C].