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Abstract
The effect of laser cladding on the surface microstructure and corrosion properties of coated/uncoated specimens were investigated. Fe-based alloy coating was produced on 35CrMo steel by laser cladding. The phase composition, microstructure, interface element distribution, microhardness and corrosion resistance of the cladding coating were measured. The results show that the cladding layer is mainly composed of α-Fe phases, the microstructure presents a gradient distribution, and a good metallurgical bond is formed at the boundary with the substrate. Microhardness profiles show that the average microhardness of the cladding coating is about 2.1 times higher than that of the uncoated specimen. In addition, the electrochemical results show that the coated specimen exhibits far better corrosion resistance than to the uncoated specimen.
Highlights
The large rotating shaft is the main bearing component of the full-swing propeller for marine dynamic positioning equipment, and works in very complicated conditions
It could be found that the microhardness of of the claddingspecimen specimen presents a gradient change, and change a sharpoccurs change occurs at the thelaser laser cladding presents a gradient change, and a sharp at the bounding bounding of thecoating cladding and the
The results show that the formation of the protective film on the cladding layer on substrate the cladding leads to its having a better corrosion resistance
Summary
The large rotating shaft is the main bearing component of the full-swing propeller for marine dynamic positioning equipment, and works in very complicated conditions. We improved the overall mechanical properties of the rotary shaft by improving the casting and forging method [1]. It is a kind of alloy structural steel widely used in industrial production, and it is often used for the manufacture of crankshaft, spindle and other important parts, owing to its low cost, high-impact toughness, static strength and higher fatigue limit [2,3]. Fu et al investigated the application of laser cladding Fe-based alloy on rails and wheels, and the results indicated that the wear properties improved significantly [8]. Laser cladding technology is widely used in the remanufacture of some important parts, such as aircraft parts, railways and die [9,10,11]
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