The solidification structures of
cast Fe-B-C alloy containing more than 2.0%B and lower than 0.2%C and the structures and
properties of alloy after heat treatment were researched by means of optical microscopy (OM), scanning electron microscopy (SEM), X-ray diffraction (XRD), hardness measurements, impact tester and pin abrasion tester. The results show that the solidification structures of
cast Fe-B-C alloy consist of boride (Fe2B), pearlite and ferrite, and boride distributes along grain boundary in network form. After normalizing at 950℃, the part broken network of boride in cast Fe-B-C alloy appeared, the matrix all transformed into lath martensite. The hardness of cast Fe-B-C alloy increased obviously and neared to HRC 60, its impact toughness and dynamic fracture toughness exceeded 10 J/cm2 and 30 MPa·m1/2, respectively. In the condition of pin-on-disk wear, cast Fe-B-C alloy showed excellent
abrasion resistance. Its abrasion resistance is more excellent than that of Ni-hard white cast iron, GCr15 and Cr12MoV, nears to that of high chromium white cast iron. Cast Fe-B-C alloy has simple melting process and good casting property, does not contain costly nickel and molybdenum elements and so has low production cost.