Numerical Analysis of Surface Formation of Titanium Parts During Direct Laser Deposition
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.
KeywordsDirect laser deposition Titanium alloy Temperature field Free surface Surface curvature
The work was carried out with financial support from the Ministry of Education and Science of the Russian Federation in the framework of realization complex project Contract No. 14.574.21.0175, 26.09.2017.
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