Pre-deposited coatings consisting of pure TiC and TiC+Ni micron size powders were consolidated over the surface of 347 stainless steel flat specimens by means of a high speed raster-scanning 1 kW CO2 laser with a TEM00 beam of about 0.4 mm diameter. Samples were characterized using SEM, EDS, XRD, optical metallography and microhardness. The coatings showed a strong metallurgical bond with the substrate, good mixing of substrate and coating materials on the surface, rapid dilution of coating within the substrate, low porosity and a considerable increase in surface hardness. Some of the microstructural features observed are explained in the light of solidification theory. This technique could serve applications where selective regions of a steel substrate need to be wear-resistance enhanced.

Topics
Computer graphics, Laser scanning, Hardness, Metallography
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