Research of microstructure of spherical graphite iron by electropulsing annealing

This paper investigated the solid-state graphitization of spherical graphite iron by electropulsing annealing. The results indicated that the electropulsing annealing can accelerate the decomposition of cementite, improve the diffusion ability of carbon in the matrix and make more neonatal graphites in small size be formed. With the increase of electropulsing annealing temperature, the graphitization rate is accelerated. At the high temperature and the quick heating rate, the solid-state graphitization can be finished in a short time. Analysis shows that electropulsing annealing promotes the nucleation of graphite and the decomposition of cementite, consequently, the solid-state graphitization of spherical graphite iron is accelerated.