Graphitization Of Unmelted Particles in Recarburizer

In the molten iron, in addition to the carbon that has been dissolved in the molten iron, the recarburizer also contains residual, undissolved carbon in the form of graphite, which is drawn into the stirred liquid stream in granular form. Most of the unmelted, coarse graphite particles are suspended on the surface of the molten iron near the furnace wall when energized, and some of them are attached to the middle of the furnace wall, which is equivalent to a stirring corner. At this time, once the energization stops, these coarse graphite particles will be slowly suspended due to buoyancy. Very tiny particles beyond the observation range of the optical microscope can be suspended in the molten iron not only when the power is turned on, but also when the power is stopped during the melting of the graphite. According to reports, the closer to the material that constitutes the eutectic nucleus, even if the crystallinity of the added graphite is somewhat different from that of the eutectic graphite, it is bound to have a greater degree of coupling compared with other materials that can be inferred to form the graphite core. From this point of view, it can be considered that the suspended fine graphite particles are conducive to the formation of graphite cores, which can prevent the cast iron from overcooling and whitening.