Исследованы дефекты строения сплава типа ВКНА-4УР в зависимости от режимов селективного лазерного сплавления. Разработаны математические регрессионные модели, адекватно описывающие влияние мощности лазера, скорости сканирования и межтрекового расстояния на пористость и склонность к образованию трещин синтезированного сплава. Определены режимы обработки, позволяющие минимизировать число дефектов Жаропрочный никелевый интерметаллидный сплав, аддитивные технологии, селективное лазерное сплавление, мощность лазера, межтрековое расстояние, скорость сканирования, пористость, микротрещины, дефекты структуры
The influence of the structure and concentration of the stiffening component on the physicomechanical properties of the heat-resisting intermetallic alloy VKNA-4U was investigated. The dependence of the strength properties of the alloy on the composition and ratio of the hardeners α-Al2O3, Y2O3, HfO2, ZrO2 was experimentally determined. Using scanning electron microscopy (SEM), it was found that when the alloy is reinforced with hafnium, yttrium and aluminum oxides, the dispersed hardener does not dissolve in the matrix. These compositions are considered as the most promising for the stiffening of VKNA-4U alloy.
It is shown in this paper that the required content of the oxide reinforcing filler in the VKNA-4U matrix is 2%, at which a balance is reached between the maximum value of strength and ductility. In the future, VKNA-4U powder composition mechanically alloyed with β-Al2O3, Y2O3, HfO2 oxides can be used as a building material for additive synthesis technologies for power fasteners of gas turbine engines (GTE).
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