Abstract
By applying 2205 duplex stainless steel powders to repair and improve carbon steel, multi-pass laser-cladding tests were conducted on Q235 carbon steel surfaces with different laser powers in the range of 1.9~2.5 kW in order to evaluate the performance of the laser-cladding layers. The phase composition, macro- and microstructure, electrochemical corrosion resistance, friction, and wear resistance of the laser-cladding layers were investigated. Macroscopic observation identified no obvious cracks. The phases that made up the multi-pass laser-cladding layers were γ-Fe and α-Fe. Owing to the optimal laser power at 2.3 kW, a large number of equiaxed crystals and a small number of cellular crystals made up the microstructure of the prepared laser-cladding layer, which contributed to its good corrosion resistance. The wear resistance of the multi-pass laser-cladding layer and the carbon steel was also studied. A combined action of adhesive wear and abrasive wear, accompanied by oxidative wear, was determined through observation of pits and furrows on the friction surface of the multi-pass laser-cladding layer, while a typical mechanism of abrasive wear was confirmed by checking the friction surface of the carbon steel.
Highlights
Stainless steels, nickel-base alloys, and cobalt-base alloys are widely used in oil and gas, chemical, marine, aerospace, and nuclear power industries, owing to their excellent mechanical properties and corrosion-resistance characteristics [1,2,3,4,5,6]
The metallurgical and geometrical characteristics of the 316L stainless steel cladding layers deposited onto the mild steel substrate at different locations along the length of the track were studied by Rahman Rashid et al, and the results showed a remarkable change in the thickness of the cladded layer along the length direction, with the initial thickness (0–15mm) of the cladded layer being much thinner than the final thickness
Q235 carbon steel and 2205 duplex stainless steel (2205DSS) powder were used as the substrate material and the laser cladding material in the experiment, respectively
Summary
Nickel-base alloys, and cobalt-base alloys are widely used in oil and gas, chemical, marine, aerospace, and nuclear power industries, owing to their excellent mechanical properties and corrosion-resistance characteristics [1,2,3,4,5,6]. The laser-cladding technique can offer a very promising way to restore the geometry and structural integrity of carbon steel components that have suffered from corrosion cracking and wear damage. The above feature of laser cladding makes it one of the most promising surface-modification techniques. A laser-cladding layer with good metallurgical bonding with the substrate is formed by using a high-energy density laser beam to rapidly melt metal powders [7]. The surface performance of materials is improved by means of imparting a laser-cladding layer with extremely high wear and corrosion resistances
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