Experimental Study and Mathematical Modeling of the Processes Occurring in ZrN Coating/Silumin Substrate Systems under Pulsed Electron Beam Irradiation

Abstract

This paper presents a study of a combined modification of silumin, which included deposition of a ZrN coating on a silumin substrate and subsequent treatment of the coating/substrate system with a submillisecond pulsed electron beam. The local temperature on the samples in the electron-beam-affected zone and the thickness of the melt zone were measured experimentally and calculated using a theoretical model. The Stefan problem was solved numerically for the fast heating of bare and ZrN-coated silumin under intense electron beam irradiation. Time variations of the temperature field, the position of the crystallization front, and the speed of the front movement have been calculated. It was found that when the coating thickness was increased from 0.5 to 2 μm, the surface temperature of the samples increased from 760 to 1070 °C, the rise rate of the surface temperature increased from 6 × 107 to 9 × 107 K/s, and the melt depth was no more than 57 μm. The speed of the melt front during the pulse was 3 × 105 µm/s. Good agreement was observed between the experimental and theoretical values of the temperature characteristics and melt zone thickness.

Комплексная Электронно-Ионно-Плазменная Обработка Силумина

“…Для формирования в поверхностных слоях материалов неравновесных многофазных состояний, которые обеспечивают существенное улучшение эксплуатационных характеристик изделий, а порой их уникальные свойства, применяется комбинированная электронно-ионно-плазменная обработка материалов [1][2][3][4][5][6]. Она может включать азотирование поверхностного слоя (толщиной от единиц до сотен микрометров), осаждение тонкого (~0,1-1 мкм) твердого или сверхтвердого (≥40 ГПа) покрытия и воздействие на поверхность электронным пучком (выглаживание рельефа поверхности, миксинг системы покрытие/подложка, вплавление твердого покрытия в более легкоплавкую подложку) [7][8][9][10][11][12][13].…”

Melting Thresholds of Materials Irradiated with a Wide Class of Pulsed Electron Beams

“…One of the potential applications of the 'GESA' machine is the processing of gas turbine engine blades. The 'SOLO' PEB source has also been widely used for scientific purposes [28][29][30][31][32]. It is an integral part of the 'UNIKUUM' complex of unique electrophysical equipment in Russia [33] (https://ckp-rf.ru/catalog/usu/43 4216/, accessed on 3 August 2023).…”