| 2025 №04 (02) | 2025 №04 (04) |
"Avtomatychne Zvaryuvannya" (Automatic Welding), #4, 2024, pp. 19-24
The effect of modes of electron beam processing of powder blanks from vk8 alloy 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 NAS of Ukraine 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. E-mail: vovabondar2896@gmail.com
3PlasmaTec LLC. 18 Pravednykiv Svitu Str., 21036, Vinnytsia, Ukraine. E-mail: Kysla.halyna@tve.com.ua
The results of the study of the influence of the cooling rate on the structure and properties of the WC-8Co hard alloy obtained 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 samples. The tungsten carbide powder obtained by PlasmaTek LLC by a chemical method from secondary raw materials was used in the paper. The presence of two phases - tungsten carbide and a cobalt β-based solid solution was established 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 obtained by the electron beam sintering method are not inferior to hard alloys obtained by the traditional technologies. 16 Ref., 2 Tabl., 7 Fig.
Keywords: hard alloy, electron beam sintering, tungsten carbide, cooling rate, grain size
Received: 28.04.2025
Received in revised form: 03.06.2025
Accepted: 29.07.2025
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