Аннотация:An evaluation model on the nodule count of graphite particles in ductile iron castings was developed based on a series of orthogonal experiments. The model is proposed for evaluating the count of graphite particles in ductile iron castings with different carbon equivalent (CE), local solidification time (ts), and maximum undercooling. According to the nodule count spacial distribution theory, the graphite nodule density Nv equals nuclei density after solidification. The measurement of NA values were carried out on experimental ductile iron castings designed according to the orthogonal principles. Nv was calculated from area densities NA using Owadano rules. The results indicate that the count of graphite particles has a close relationship to CE, ts and instead of one of these three parameters.
