Abstract
A novel process called continual local induction cladding (CLIC) was proposed to clad NiCrBSi alloy coatings on AISI 1045 steel substrate with the scanning speed of 0.5, 1.0 and 1.5 mm/s, respectively. The cladding temperature, microstructure, microhardness and wear resistance of the NiCrBSi coatings were characterized by infrared thermal imager, X-ray diffraction (XRD), electron microprobe analysis (EMPA), energy dispersive spectrometer (EDS), micro-sclerometer and pin-on-disk friction tests. The shifted and broadened peak of XRD patterns is mainly influenced by the lattice distortion based on Voigt method, which is due to the formation of substitutional solid solution. The varied peak intensity suggests that the preferred orientation of (200) becomes more obvious as the scanning speed increases. The columnar crystal could not observed in the microstructure of CLIC coatings presumedly due to electromagnetic stirring. Cr23C6 is firstly deposited in the coating and may be redissolved in high temperature.The microhardness is varied from 355 to 681 H V and the wear resistance of cladding coatings is about 6 to 10 times higher than that of substrate.
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