Effect of reheating zones in additive manufacturing by means of electron beam metal wire deposition method

摘要

The influence of heat transfer on molten pool size and temperature during the additive metal wire deposition process is shown. A mathematical model based on an energy equation that considers latent heat during melting is proposed. The model also examines the temperature dependences of thermophysical properties and the results are presented graphically. The analysis of computer simulation results reveals a gradual increase in molten pool size during deposition of a hollow cylindrical shape due to the influence of reheating zones. The results of experimental studies (conducted on ELA-40I and AELTK-12 electron beam installations) that confirm the simulation results are presented. Both sets of results suggest the need for feedback in order to control the molten pool temperature. As such, the proposed model is used to conduct a study involving temperature feedback. The analysis of time dependences obtained via simulation shows the fundamental possibility of stabilizing the temperature at a desired point. Limitations and possible improvements to this method are explored. (C) 2020 CIRP.