Abstract
A FeCoNiCrAl0.5Ti0.5 high entropy alloy coating was successfully deposited on the AISI 1045 steel by laser cladding (LC) technology. The suitable laser energy density of LCed FeCoNiCrAl0.5Ti0.5 coating on AISI 1045 steel is determined as 50–62.5 J/mm2. After a systematic exploration, a dense coating without obvious micro-defects can be produced using optimized parameters: the laser power = 2000 W, the scanning speed = 6 mm/s, laser beam = 4 mm, hatch space = 2 mm, feeding rate = 24 g/min. The LCed FeCoNiCrAl0.5Ti0.5 coating is mainly composed of a chrysanthemum-shaped eutectic structure with dendrites and inter-dendrites. Wear rate of the LCed coating is only about one-third of that of the substrate benefiting from its high hardness. The hardness and wear resistance of the AISI 1045 steel surface are improved significantly by LCed FeCoNiCrAl0.5Ti0.5 coating.
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