Методами рентгенографического анализа, дифференциальной сканирующей калориметрии и измерения микротвёрдости исследованы склонность к аморфизации (СА) и механические свойства ряда новых многокомпонентных сплавов на основе железа. были получены в аморфном состоянии литьём в медный кокиль в форме пластинок толщиной 0,5 и 2 мм соответственно, а кристаллизация сплава Fe 50,0 Ni 19,0 Cr 6,5 Мо 1,5 V 1 B 14,1 С 2,5 Р 4,4 Si 1 подавляется только в тонких лентах, полученных методом спиннингования расплава. Анализ СА был проведён в рамках известных термодинамических критериев, основанных на температурах перехода стеклования (T g ), начала кристаллизации (T ons ) и ликвидуса (T l ). Установлено, что критические скорости охлаждения, необходимые для объёмной аморфизации первых двух сплавов, предсказываемые критерием m (2T ons T g )/T l (1010 и 262 К/с соответственно), хорошо согласуются со значениями Corresponding author: Viktor Konstantinovich Nosenko
The comparative analysis of magnetic properties of cut cores made of nanocrystalline Fe73Nb3Cu1B7Si16 alloy ribbon and cores made of the same ribbon with preliminary tension-induced transverse magnetic anisotropy was carried out. The possibility of improving magnetic properties of cut cores, decreasing loss, and increasing DC bias immunity of reversible magnetic permeability is presented. The influence of induced magnetic anisotropy on DC bias immunity of reversible magnetic permeability was investigated. The advantages and disadvantages of new cores (made of ribbon heated under tensile stress) over cut ones were determined.
The influence of winding-induced mechanical stresses on the magnetic anisotropy and core loss in toroidal cores made of Fe73Cu1Nb3Si16B7 ribbon is studied. The ribbon for the cores was rapidly pre-heated under tensile stress up to 120 MPa. It was found that magnetic characteristics of the material (magnetic anisotropy energy and the core loss) can be controlled by varying the tensile stress during the preliminary rapid heating of the ribbon. It was shown that with reducing core diameter, the magnetic anisotropy energy and core loss significantly increase. However, relatively high winding-induced core loss in small cores can be significantly reduced by increasing tensile stresses applied to the ribbon during pre-heating.
Applying the x-ray, metallographic, and microdurometric methods, the phase composition and structural–stress state of the Fe-based alloys under the impact of electrospark treatment in combination with laser processing are studied and analysed. As shown, the structural–phase state of electrospark coating on the steel substrate is determined by several factors. They are the dissociation of WC carbide on the surface of alloying electrode on the W2C and W components followed by their erosion, an interaction of erosion products with elements of the interelectrode medium (C, N, O), an interdiffusion of the coating elements and a steel substrate, and the ascending diffusion of C from the substrate near-surface layers. As revealed, the heterophase coating and near-surface layers of substrate possess a complex structural–stress state. As shown, the residual stresses in different phase components have been formed through different regularities: the tensile stresses in the TiC-based compound, while the compressed stresses in the W2C, W, and Feα. The selective effect of laser heating of the coating on the stresses of different signs is revealed.
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