Study on the microstructure and properties of FeMoCoNiCrTi_x high-entropy alloy cladding layer on T10 steel

FeMoCoNiCrTi_x (x is 0.25, 0.50, 0.75, 1.00, respectively) high-entropy alloy cladding layer was prepared on the surface of T10A steel by laser cladding technology. The phase structure and microstructure of the interface between the cladding layer and the substrate were analyzed, and the cross-sectional hardness of the sample before and after the treatment were tested respectively by the microhardness tester. The results showed that the high-entropy alloy cladding layer obtained on the surface of T10A steel by laser cladding technology was mainly composed of NiCrFe and NiCrCoMo, two solid solutions whose structures were BCC and FCC, respectively. The microstructure of the cladding layer mainly comprises columnar dendrites, and equiaxed crystals appeared at the interface; As the Ti content increased, the strengthening effect of the cladding layer changed from solid solution strengthening to solid solution and hard phase mixed strengthening. The HV hardness of the cladding layer and the heat affected zone reached 792 and 620, both higher than that of the substrate. At the same time, the wear resistance of the alloy cladding layer witnessed a significant increase and its wear mode gradually changed from adhesive wear to abrasive wear.