26 June 2017 Evaluation of thermal behavior during laser metal deposition using optical pyrometry and numerical simulation
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Abstract
3D mathematical model of non-stationary processes of heat and mass transfer was developed for additive manufacturing of materials by direct laser metal deposition. The model takes into account self-consistent dynamics of free surface, temperature fields, and melt flow speeds. Evolution of free surface is modelled using combined Volume of Fluid and Level-Set method. Article presents experimental results of the measurement of temperature distribution in the area of bead formation by direct laser metal deposition, using multi-channel pyrometer, that is based on two-color sensors line. A comparison of experimental data with the results of numerical modeling was carried out. Features of thermal dynamics on the surface of melt pool have been detected, which were caused by thermo-capillary convection.
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Alexander V. Dubrov, Yuri N. Zavalov, Fikret Kh. Mirzade, Vladimir D. Dubrov, "Evaluation of thermal behavior during laser metal deposition using optical pyrometry and numerical simulation", Proc. SPIE 10330, Modeling Aspects in Optical Metrology VI, 103301K (26 June 2017); doi: 10.1117/12.2270269; https://doi.org/10.1117/12.2270269
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