Effect of high-temperature heat treatment on microstructure and properties of FeMnCrNiCo + 20 wt.%TiC high-entropy alloy coating

In the present study, FeMnCrNiCo + 20 wt.%TiC laser cladding layer was heat-treated at 600 °C/750 °C/900 °C and held for 75 h. After heat treatment, the ceramic particles segregated at grain boundaries were precipitated homogenously by diffusion, which reduces the crack resistance sensitivity at the boundary and improved the elongation of the coating. At the same time, the diffusion of Ti and C elements at high-temperature results in the solid solution strengthening of the matrix metal, increasing the lattice distortion of FCC, and improving the micro-hardness and crack propagation resistance of the cladding layer. However, heat treatment of the cladding layer did not improve the spalling behavior of particles in the wear process, and the main wear mechanism was abrasive wear.