Numerical simulation of temperature field in multi-channel action of 45 steel by scanning electron beam in rust removal

In order to study the evolution of the dynamic removal characteristics of temperature field and the factors affecting the quality of the rust removal layer on the surface of steel 45, the scanning electron beam rust removal simulation model was established by using COMSOL Multiphysics finite element software. Based on the improved Gaussian surface heat source model, continuous circular scanning method was adopted. The heat source was applied and moved by COMSOL multiphysical field coupling, and the dynamic removal characteristics of temperature field were obtained under different beam source power, scanning frequency and scanning speed, and the factors affecting the quality of the material were analyzed. The results show that the improved Gaussian heat source model can simulate the molten pool morphology. The scanning electron beam source power and scanning rate have a significant effect on the surface rust removal, and the preheating of the matrix can improve the hardness and wear resistance of the rust removal layer. There is obvious thermal accumulation in the process of rust removal, and the rust removal layer of the first line will be reheated during the second phase of rust removal.