Microstructure and Hardness of Laser Cladding of AlCoCrFeNi_2.1 Eutectic High Entropy Alloy Coating

AlCoCrFeNi_2.1 eutectic high entropy alloy coating was prepared on H13 alloy steel by laser cladding process. The effects of cladding process parameters on the microstructure and hardness of AlCoCrFeNi_2.1 coating were studied by adjusting laser power and scanning speed. The results show that the laser power and scanning speed do not affect the phase composition of the coating. The formation of FCC+BCC phase is attributed to the combined effect of high mixing entropy and rapid cooling rate during laser cladding. When the laser power and scanning speed are 1600 W and 6 mm/s, respectively, the hardness of the coating is 345.2 HV. The improvement of the coating hardness is attributed to the combined effect of fine grain strengthening and solid solution strengthening.