ASABE Technical Library - Abstract

Abstract. Laser cladding, as a newly surface modification technique, is to fuse an alloy layer or coating of enhanced mechanical and chemical properties on the surface of a substrate. A wear resistant metal silicide composite consisting of Mo₂Ni₃Si ternary metal silicide dendrites and the nickel-base solid solution matrix (Mo₂Ni₃Si/?-Ni) was designed and deposited by the laser cladding. The influences of the laser parameters on the material‘s properties are complex and have significant effects on the quality of coating. The microstructure of the coatings was analyzed by scanning electron microscopy, with attached energy dispersive spectroscopy microprobe, and by X-ray diffraction. SEM inspection of the samples showed that all coatings exhibited similar phases in their microstructure, but the phases presented differ in morphology, size and distribution. Dilution and interaction zone of the coatings were also discussed in this paper. The results showed that the Mo₂Ni₃Si/?-Ni coatings were crack-free and had a good metallurgical bonding with 45 steel with a low dilution under the optimum laser conditions (P=1 KW, V=200 mmmin^-1). The cladding layer contains Mo₂Ni₃Si and ?-Ni, and from the diffraction peak intensity, it could be determined that the Mo₂Ni₃Si was the major phase.