Preparing And Properties Analyzing Of The Laser Cladding Layers On Stainless Steel Kitchen Knife

Most of domestic cutlery-corporations use imported high-quality steel to produce high-end knives, which are non-economic to compete with overseas extravagance ones. Laser cladding knife, which made by a layer of wear resistant coating on the surface of cutting edge of stainless steel kitchen knife via Laser cladding technology, has the advantages of high hardness, long life and low cost. Laser cladding knife could significantly reduce the production cost of high-end knife, improve the competitiveness of China’s high-end knife brand.In this paper, Ni-based tungsten carbide composite powder、Fe-base alloy powder and Fe-base titanium carbide composite powder were laser cladded on the surface of cutting edge of 3Crl3 stainless steel kitchen knife via coaxial feeding powder. The appearance, micro structure and main properties of cladding layers were studied.The results show that the three crack-free layers has strong metallurgical bond with the matrix.The base phase Cr-Ni-Fe-C austenite and hard phase FeB、Cr23C6、 WC etc. formed the Ni-based tungsten carbide cladding layer; the base phase Fe-Cr ferrite and Cr-Ni-Fe-C austenite, and hard phase Cr7C3、Cr2Ni3 etc. formed the Fe-based alloy cladding layer; the base phase α-Fe, and hard phase TiC、Cr7C3 etc. formed the Fe-based titanium carbide cladding layer. The hard alloy phases in the three cladding layers are dispersed in the basic phase, which significantly improves the hardness and wear resistance of the cladding layer. The average microhardness of the cladding layer of Fe-based titanium carbide cladding layer is HVo.2975, and the wear resistance is about 11 times of the substrate’s; The average microhardness of the cladding layer of Fe-based alloy cladding layer is HVo.2783, and the wear resistance is about 8 times of the substrate’s; The average microhardness of the cladding layer of Ni-based tungsten carbide cladding layer is HVo.2761, and the wear resistance is about 7 times of the substrate’s. Three kinds of Laser cladding knives have excellent sharpness after edged. Ni-based tungsten carbide cladding layer and Fe-based titanium carbide cladding layer have excellent corrosion resistance, but Fe-based alloy cladding layer have insufficient corrosion resistance.