Microstructure and wear resistance of ductile cast iron laser clad with Ni-Ti-Co-C

Using electrode as laser cladding materials, the microstructure and wear re sistance of laser clad layer of ductile cast iron was studied. The laser cl ad layer can be subdivided into the melted zone where existed large amounts of austenite, graphite nodules and some carbides, and the solid state tran sformation zone which included martensite and austenite below the melted zo ne. The Ti combined with C to form TiC increasing the wear resistance; The Co significantly increased the wear resistance compared with Ti.