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 1.7−2.7 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 −0.146 V and 0.13 μA cm−2, respectively.
Single‐pass laser‐cladded 2205 duplex stainless steel (2205DSS) is fabricated on the surface of Q235 steel at different laser powers in the range of 1.7–2.7 kW. The relationships between laser powers and geometrical characteristics, microstructure, microhardness, and corrosion resistance of the cladded layers are investigated. As a result, critical laser power of 2205DSS laser cladding on Q235 steel is proposed.