Thermoelastoplastic Finite Element Analysis of TiAl6V4 Thin-walled Ring Parts Based on Laser Metal Deposition Processing

Abstract

Based on the simulation theory of stress field and temperature field in additive manufacturing, this paper numerically simulates and analyzes the laser metal deposition process of thin-walled ring, optimizes the simulation results by setting different process parameters, and analyzes the possible problems in the process of laser metal deposition and the corresponding optimization scheme. The comparison results of temperature field simulation results show that the phenomenon of temperature superposition and slow heat dissipation will occur in the printing process. Set a certain cooling time between the two adjacent layers, the temperature will gradually increase from layer by layer, and the heat dissipation will also improve, which plays an optimization role in preventing excessive temperature and remelting to a certain extent. The results of stress field analysis show that under the influence of temperature change, the upper material has a certain stress release effect on the lower material during welding, which makes the stress change between the middle layers in the printing process show a wavy trend, and large residual stress will be generated in the cooling process of the formed parts after printing. Through the deformation analysis results of the formed parts, it is concluded that the deformation of the formed parts increases gradually from bottom to top, and with the increase of printing speed, the maximum deformation caused by welding decreases gradually, but the area of high deformation area on the formed parts increases gradually.