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High Temperature Material Processes: An International Quarterly of High-Technology Plasma Processes
ESCI SJR: 0.176 SNIP: 0.48 CiteScore™: 1.3

ISSN Druckformat: 1093-3611
ISSN Online: 1940-4360

High Temperature Material Processes: An International Quarterly of High-Technology Plasma Processes

DOI: 10.1615/HighTempMatProc.2019031163
pages 275-282

CHARACTERISTIC FEATURES OF THE SURFACE RELIEF FORMATION OF METALS MODIFIED BY COMPRESSION PLASMA FLOWS

Raman S. Kudaktsin
A.V. Luikov Heat and Mass Transfer Institute, National Academy of Sciences of Belarus, 15 P. Brovka Str., Minsk, 220072, Belarus
Valiantsin M. Astashynski
A.V. Luikov Heat and Mass Transfer Institute, National Academy of Sciences of Belarus, 15 P. Brovka Str., Minsk, 220072, Belarus; National Research Nuclear University "MEPhI" (Moscow Engineering Physics Institute), 31 Kashirskoe Highway, Moscow, 115409, Russia
A. M. Kuzmitski
A. V. Luikov Heat and Mass Transfer Institute, National Academy of Sciences of Belarus, 15, P. Brovki Str, Minsk 220072, Belarus

ABSTRAKT

Action of compression plasma flows (CPF) is a promising high-energy method for material modification ensuring uniform distribution of components in ultradeep (to about 100 μm) modified layers. In the present paper, using the scanning electron microscopy, we studied the surface relief and the thickness of a modified layer of W108 steel treated with compression plasma flows. To generate a plasma flux under experimental conditions, a magnetoplasma compressor of compact geometry with an energy storage battery of 15 kJ was used. It was established that during CPF action, the molten layer of material under the action of high-density plasma spreads over the surface. After the end of exposure, at the stage of rapid crystallization of the melt, a developed surface relief is formed with a height difference from 1 to 80 μm. With increase in the energy parameters of the acting CPF, the surface irregularities first increase and then decrease again, which is associated with the melt entrainment in the liquid phase. The dependence of the average melting depth of steel on the power density of the CPF action has been established. It is shown that the heat transfer model based on the Stefan problem allows one to predict the average melting depth of the target with sufficient accuracy; however, to determine the actual thickness of the modified layer, hydrodynamic entrainment and surface irregularities should be taken into account.

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