Influence of Canbon Content on Microstructure and Properties of C_xCrFeMnNi High-Entropy Alloy Cladding Layer Fabricated by Plasma Transferred Arc

C_xCrFeMnNi (x=0.2,0.4,0.6,0.8,1.0,mole ratio) high-entropy alloy cladding layers were prepared by plasma transferred arc welding. The effects of carbon content on the macroscopic morphology, phase composition, microstructure and properties of the cladding layer were studied. The results show that when x was 0.4, 0.8 and 1.0, the forming quality of the cladding layer was relatively good, and there were no obvious defects such as pores, pits and sticky powder. The microstructure of C_xCrFeMnNi high-entropy alloy cladding layer consisted of FCC dendrites and (Cr, Fe) C carbide, and Cr₇C₃ carbide was also precipitated when x was 0.6-1.0. With the increase of carbon content, the carbide content and the average microhardness of the cladding layer increased, and the friction coefficient and wear amount decreased. When x was 1.0, the average hardness of the cladding layer was the highest of 368 HV, and the friction coefficient and wear amount were the smallest of 0.541 and 1.38 mg, respectively.