Microstructure and Electrochemical Corrosion Behaviors of Laser‐Cladded 2205 Duplex Stainless Steel

Abstract

Herein, single-pass laser-cladded 2205 duplex stainless steel is fabricated on the surface of Q235 carbon steel at different laser powers in the range of 1.7À2.7 kW. The relationships between laser powers and geometrical characteristics, microstructure, microhardness, and corrosion resistance of the cladded layers (CLs) are analyzed. The results show that with the increase in laser power, the width and height of the bead increase, and the dilution rate and depth of the molten pool also significantly increase. Furthermore, the shape of ferrite gradually transforms from coarse to slender and eventually turns into a discontinuous vermicular shape. It is found that the CL obtained at a laser power of 2.3 kW has higher average microhardness and exhibits better corrosion resistance than the other samples (%20 times better than that of the carbon steel substrate), with its corrosion potential and corrosion current density of À0.146 V and 0.13 μA cm À2 , respectively.

A Study of Multi-Pass Laser-Cladding 2205 Duplex Stainless Steel Coating: Microstructure, Electrochemical Corrosion Behavior, and Wear-Resistance Properties

“…A bright white area in zone B is also observed. This phenomenon is consistent with the microstructures obtained from the single-pass laser-cladding layer under low laser power [24]. The solidification structure in region A is equiaxed crystal, basically without directionality.…”

“…The surface of the substrate material was polished with sandpaper, down to 2000#, to remove the oxide film and ensure the smoothness of the substrate material, which was then cleaned with alcohol to remove oil from the sample surface and finally placed in a drying oven. The 2205DSS powder was bought from AMC Powders Corp. and consisted of particles of long strips with sizes in the range of 100-200 µm [24]. The powder shape and relative microstructure demonstrations of the Q235 carbon steel were described in our previous work [24].…”

“…The 2205DSS powder was bought from AMC Powders Corp. and consisted of particles of long strips with sizes in the range of 100-200 µm [24]. The powder shape and relative microstructure demonstrations of the Q235 carbon steel were described in our previous work [24]. The 2205DSS powder needed to be dried in a vacuum furnace at 70 • C for 5 h prior to the laser-cladding process.…”

“…Moreover, no further research has been carried out with the aim of evaluating the relationship between laser-cladding parameters and the structure and performance of the laser-cladding layers. Our previous study focused on relationships between laser powers and geometrical characteristics, microstructure, microhardness, and corrosion resistance of single-pass lasercladded 2205 duplex stainless steel layers [24]. In order to obtain large-area laser-cladding layers and promote their application in practical environments, further related multi-pass laser-cladding studies urgently need to be carried out.…”

Corrosion Behavior of Selective Laser Melted Ti-6Al-4V in 0.1 mol/L NaOH Solution

“…Although the goals of these works above tried to utilize AM to fabricate components with complex shapes without sacrificing their mechanical and corrosion properties [1][2][3][4][5][6][7][8][9][10][11][12][13][14], their results are contradictory. Therefore, more studies are required to be conducted on the optimization of the AM method and characterization of the passive films formed [11,12].…”