Abstract
The surface of WC-Co hard alloy was modified treatment by high current pulsed electron beam (HCPEB). The surface microstructure evolution mechanism of WC-Co hard alloy was characterized by XRD, SEM, EBSD, and TEM, respectively. The temperature distribution of WC-Co hard alloy during HCPEB treatment process was calculated and discussed. The results show that rapid melting and rapid solidification induced by HCPEB caused the phase transformation and the microstructure evolution on the surface of the hard alloy, and when irradiation times was 13th times, the microcracks and voids on the WC-Co hard alloy surface were gradually healed by remelting repeatedly, causing the formation of dense nanostructures. The microhardness of the modified specimen surface layer by 13th irradiation increased to 1159.0 HV, and the wear resistance increased to 1.72 times that of the matrix. The strength and wear resistance of the surface layer of the specimen were improved due to the refinement of WC grains, the forming of WC1-X nanophase, and the precipitation of nanographite particles. The microstructure evolution mechanism on the alloy surface after the modified treatment was proposed that a metastable equilibrium system was formed (WC + WC1-X + Co3W9C4+graphite phase).
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