Laser Beam Cladding of Stellite on Cast Iron
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Stellite
Cladding (metalworking)
Cladding (metalworking)
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Cladding (metalworking)
High Speed Steel
Carbon steel
High carbon
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Carbon steel
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The present study concerns the generation of a wear resistant Stellite 6 CO2 laser
clad layer on the surface of an EN19 steel substrate by means of laser surface cladding. Laser surface cladding
was carried out by melting the Stellite powder (particle size 10 to 40 μm) supplied through a
pneumatically driven powder delivery system (using a 4 MP powder unit) with a 9 kW continuous wave (CW)
CO2 laser with the wavelength 10.6 µm. The microstructure of the clad layer was found
to consist of three zones: a clad layer comprised of dendrites of Stellite 6; an alloyed zone comprised of a
cellular microstructure, which was a mixture of Fe and Co; and the heat affected zone (HAZ), which was a
mixture of pearlite and martensite. Compared to the EN19 steel substrate, the micro-hardness of the clad layer
represented a significant improvement, increasing to 1200 VHN.
Stellite
Cladding (metalworking)
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Aimed at the laser cladding stellite X-40 alloy on GH4133 high temperature wrought alloy ,the effects of laser power, scanning velocity and powder thickness on the shape and quality of cladding layer were examined. The results show that the laser cladding coating with demandable size, shallow melt depth and integrated melt interface can be obtained by optimizing laser power, scanning velocity and powder thickness. After ageing treatment, the microhardness of laser cladding coating is the same with that of GH4133 base metal, thus the bulk properties of the blade are homogeneous and consistent.
Stellite
Cladding (metalworking)
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Cladding (metalworking)
Carbon steel
Carbon fibers
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Stellite 6 was fabricated by laser cladding on a 1050 steel (MS) substrate with laser powers of 1 kW (MS-1) and 1.8 kW (MS-1.8). The chemical compositions and microstructures of the coatings were analysed by X-Ray Fluoroscense, optical microscopy and scanning electron microscopy. The microhardness of the coatings was examined and the wear mechanism of the coatings was evaluated using a ball-on-plate wear testing machine. The results indicated less cracking and pore development for Stellite 6 coatings applied to the 1050 steel substrate with the lower laser power (MS-1). Moreover, the Stellite coating for MS-1 was significantly harder than that obtained for MS-1.8. The wear test results showed that the weight loss for MS-1 was much lower than for MS-1.8. The evaluations of dilution and calculation of carbon content indicated that MS-1 has lower dilution and higher coating C content than MS-1.8. It is concluded that the lower hardness of the coating for MS-1.8, substantially reduced the wear resistance of the Stellite 6 coating and the lower hardness of the coating for MS-1.8 was due to higher level of dilution and lower coating C content. The coating-substrate couple must be considered in assessing the likely performance of the coating under service conditions.
Stellite
Carbon steel
Cladding (metalworking)
Dilution
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Laser cladding of magnesium alloy was studied in order to develop a surface treatment method which produce modified region with excellent fatigue property. Single beam, cross twin beam and tandem twin beam was applied. Si powder was used as a mixing powder to expect formation of Mg_2Si in the weld pool. The powder was stirred well in case of tandem beam. Weld pool molten by the forward beam might be strongly stirred by the followed beam according to the result of FEM analysis.
Cladding (metalworking)
Tandem
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