Laser Cladding of Wear- and Corrosion-Resistant Layer on Carbon Steel.

In order to improve the corrosion and wear resistances of carbon steel (SS400), laser cladding has been done to make a TiC particle-dispersed Ni-Cr composite layer by irradiating a CW CO2 laser beam on a precoated powder layer, which consisted of the powder mixtures of Ni-Cr with 10, 20, 25, 30, 40, 50, 100 mass% TiC. The optimum laser beam traveling speed to obtain a smooth surface layer decreased with the increase in TiC content in the powder mixture. The hardness of the composite layer increased with increasing TiC content to HV300, HV340-350 and HV390-420 for 10, 20, 30 mass% TiC, respectively. The wear resistance of the composite layer increased with the increase in TiC content and that with 30 mass% TiC reached ten times as large as that of basemetal. The corrosion resistance of the composite layer was equaled to that of SUS304.