Microstructure and properties of ceramic particle reinforced FeCoNiCrMnTi high entropy alloy laser cladding coating

Abstract

FeCoNiCrMnTi high entropy alloy (HEA) coatings has been proved the combined high hardness and good corrosion resistance. In order to improve wear resistance of stirrer in sewerage plants, ceramic particle reinforced FeCoNiCrMnTix (atomic ratio x = 0, 0.5, 1.0, 1.5) HEA coatings were produced on the surface of austenite stainless steel by laser cladding. The influence of atomic ratio of titanium in high entropy alloys on the number of ceramic, microstructure, tribology and corrosion behavior at room temperature of the laser cladding coatings were studied. Experimental results revealed that the cladding coatings were mainly composed of FCC-type solid solution. With the addition of titanium, TiN particle was in-situ produced in the coating at high purity N2 gas protection. In addition, Ti(Fe,Co,Ni,Cr)2 Laves phase was found while x is more than 1.0. With the increase of titanium content, the amount of TiN in the coating increased, which improved the wear resistance of the coating. However, corrosion and crack resistance of the coating decreased while Ti content exceeded 1.0. The coating of FeCoNiCrMnTi0.5 had about 1.9 times of wear resistance of the substrate, and its corrosion resistance was almost same as the substrate.