| 2025 №09 (03) |
DOI of Article 10.37434/tpwj2025.09.04 |
2025 №09 (05) |
The Paton Welding Journal, 2025, #9, 33-38 pages
Effect of modes of electron beam treatment of powder blanks from hard alloys on formation of the microstructure and properties of sintered products
M.O. Sysoiev1, V.M. Nesterenkov1, V.M. Bondar2, H.P. Kysla3
1E.O. Paton Electric Welding Institute of the NASU. 11 Kazymyr Malevych Str., 03150, Kyiv, Ukraine. E-mail: sysoiev.maksym@tve.com.ua2East Ukrainian Volodymyr Dahl National University 17 John Paul II Str., 01042, Kyiv, Ukraine
3PlasmaTec LLC, 18 Pravednykiv Svitu Str., 21036, Vinnytsia, Ukraine
Abstract
The results of the study of the influence of the cooling rate on the structure and properties of the VK8 hard alloy produced by the electron beam sintering method are presented. The use of an electron beam provides high controllability of the heat treatment processes, which allows regulating the cooling rate of hard alloy specimens. The tungsten carbide powder produced by PlasmaTec LLC by a chemical method from secondary raw materials was used in the work. The presence of two phases — tungsten carbide and a cobalt-based β-solid solution was revealed by metallographic and X-ray analysis methods. There is no η-phase, free carbon or pores in the structure. It is shown that tungsten carbide crystals grow with an increase in cooling time. In terms of hardness and crack resistance, hard alloys produced by the electron beam sintering method are not inferior to hard alloys produced by the conventional technologies.
Keywords: hard alloy, electron beam sintering, tungsten carbide, cooling rate, grain size
Received: 28.04.2025
Received in revised form: 03.06.2025
Accepted: 16.09.2025
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