Numerical analysis of surface formation of titanium parts during direct laser deposition

Abstract

The calculation method for determining technological mode parameters of the direct laser deposition process has been developed taking into account the features of a bead surface formation for titanium alloys. A method for solving the equilibrium equations of the liquid phase in the gravity field was proposed. This solution allows determining the deposited bead shape with a high accuracy and a minimal cost of computing resources. A comparison of calculated and experimental data of deposited bead parameters was presented. The DLD tests were carried out using VT6 (Ti6Al4V) powder and substrate. The highest error value does not exceed 6%. Thus, the calculation method for the deposited bead shape satisfactorily describes the process of heat transfer during the DLD process and can be used for preliminary selection of the process parameters. It is also established that the process parameters have a significant influence on the surface roughness of the grown part.