Пороговые условия термокапиллярного формирования глубокой каверны в аддитивном процессе селективного лазерного плавления металлического порошкового слоястатья
Статья опубликована в журнале из списка RSCI Web of Science
Аннотация:The deep penetration mode at selective laser melting of a metal powder layer is determined by a special and intense hydrodynamic process in a thin molten layer at rapid heating of the metal by using a focused beam. This mode is also widely used in laser and electron beam welding. This indicates the similarity of hydrodynamic processes, which differ significantly in the parameters of the applied radiation (power, power density, focusing spot diameter). Threshold conditions of thermocapillary deep penetration (without evaporation) for various metals (Al, Cu, Fe, Ti) in a wide range of changes in beam parameters, including those used for selective laser melting of a powder layer, is investigated. The calculated and experimental values comparison of the radiation parameters corresponding to the transition to the deep penetration mode for selective laser melting of the powder layer and laser welding is presented. The correlation of these values confirms the thermocapillary mechanism of the deep cavity formation and the similarity of hydrodynamic processes at welding metals by using a laser beam.