Nodular Graphite in Sinered Products of Cast Iron Swarf Powder, Fe-Si-C Mixed Powders, and Ni-C Mixed Powders (1)

Property of Graphite and Principle of Graphite Nodularization

Abstract

Each nodular graphite consists of a large number of crystallites, and each crystallite is so oriented that its basal planes are at right angles to the radii of a nodule. The graphite crystal, however, originally has a strong tendency to a preferential growth along the (0001) basal plane. Therefore, it must be concluded that nodular graphite in a sintered product can be formed during cooling as a result of the precipitating of super-saturated carbon atoms at pore-surface and subsequently piling-up of flake graphite in a pore as a spherical framework.