Surface Modification of Ni-Based Alloy by High Current Pulsed Electron Beam （HCPEB）

Due to the excellent performance of nickel-base superalloy in high temperature,it is widely used in thermal protection structure.In order to improve its surface properties,bombard its surface with high current pulsed electron beam(HCPEB).This article focuses on temperature field simulation and microstructure.With the help of abaqus,simulate the temperature field on the surface of the DZ22 nickel-base alloy during bombardment.The simulation results show that the surface temperature is 1629℃ when the time after bombardment reaches 0.68 μs,which exceeds the melting point of DZ22 nickel-based superalloy.Based on a laser confocal microscope,observe the surface morphology of the alloy before and after bombardment.The experimental results showed that the surface of the specimen after bombardment produced a crater morphology.X-ray diffraction analysis of the microstructure on the surface of the alloy before and after bombardment shows that bombardment changes the stress state of the alloy and the grain growth direction.The results show that the bombardment causes the crater morphology on the surface of the DZ22 alloy and changes its grain orientation.