Primary elements in ductile iron

摘要

Besides the requirement that the graphite be in a spheroidal form, the ferrite and pearlite ratios can be controlled through alloying, cooling rate control or post-casting heat treatment to vary the relative amounts pearlite and ferrite from 0% pearlite and 100% ferrite, to 100% pearlite and 0% ferrite. The control of the pearlite and ferrite ratio manipulates the tensile, yield and elongation characteristics of the ductile iron to produce numerous standard grades of the material.