Analysis of electron beam surface quenching performance and Simulation and verification of temperature field of 35CrMo Steel

Inhalt:
Electron beam surface quenching can significantly refine grain, effectively improve the hardness and wear resistance of metal materials, and thus prolong the service life of the workpiece because of its processing characteristics of fast heating and cooling. Based on the working principle of electron beam equipment and heat transfer theory, established 35 CrMo steel hardening the surface of the three-dimensional temperature field finite element model, using ANSYS software for the whole of the electron beam surface hardening in the process of temperature field simulation and experimental verification, and discusses the electron beam and electron beam spot diameter on the influence of the temperature field and hardened layer dimensions. The results show that the temperature field during electron beam quenching is semi-oval and the temperature distribution on the symmetry plane is spoon-shaped. After electron beam quenching, the hardening layer, the transition layer and the matrix are formed. The microhardness of the hardening layer is increased to 3-4 times that of the matrix, and the microhardness of the transition layer is increased to 2-3 times that of the matrix. Both electron beam current and electron beam spot diameter have influence on the size of hardened layer, especially the electron beam spot diameter. The experimental results are in good agreement with the simulation results, which indicates that the established temperature field model is correct and reliable.