Abstract: To optimize the process parameters of HCPEB modification, and to obtain the optimal pulse time and electron beam energy density, FEM is used to simulate the temperature field distribution of electron beam bombardment process on CoCrAlY coated by Al film, analyzing the effects of pulse time and electron beam energy density on the surface alloying. Results show that when the thickness of aluminum film is 2 μm, the optimum combination of pulse time and electron beam energy density is 1.5 μs, 6 J/cm2, and the melting depth of the corresponding substrate is 0.2 μm. With the extension of pulse time, both the surface temperature and heat affected zone of the sample gradually increase. When the energy density is 4 J/cm2, the pulse time is appropriately extended to between 1.5 μs and 6 μs, which can achieve ideal electron beam modification and surface alloying effect.

Key words: HCPEB, FEM, temperature field, surface alloying