79 / 2021-06-30 14:47:18

Effect of Heat Treatment on the Microstructure and Mechanical Properties of Plasma Cladded CoCrFeNiMn Coatings on CGI

high entropy alloy,coating,heat treatment,microstructure,property

CoCrFeNiMn high-entropy alloy coatings were prepared on compacted graphite iron  through plasma cladding technology to strength the CGI substrate. The effects of heat treatment temperatures and times on the microstructure and mechanical properties of the coatings were investigated. After heat treatment, the coating remained as a single FCC phase as compared to the deposited one, with smaller dendrites, larger dendritic spacing and Cr-rich compounds precipitated between dendrites. The hardness of  the coatings increased after heat treatment. The coating had the highest hardness of 564 HV_0.2, the highest friction coefficient of 0.95 and the lowest wear mass loss of 0.8 mg after treated at 660°C for 90 min. The the coating had the highest tensile strength of 1034 MPa after heat treated at 780°C for 90 min.