Study of the Structure and Properties of Deposited Layers of NiCrBSi Alloy, Modified with Composite Material

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DOI https://doi.org/10.15407/pmach2023.04.067
Journal Journal of Mechanical Engineering – Problemy Mashynobuduvannia
Publisher Anatolii Pidhornyi Institute for Mechanical Engineering Problems
National Academy of Science of Ukraine
ISSN  2709-2984 (Print), 2709-2992 (Online)
Issue Vol. 26, no. 4, 2023 (December)
Pages 67-76
Cited by J. of Mech. Eng., 2023, vol. 26, no. 4, pp. 67-76

 

Author

Pavlo A. Sytnykov, National Technical University “Kharkiv Polytechnic Institute” (2, Kyrpychova str., Kharkiv, 61002, Ukraine), e-mail: pavel.welder@ukr.net, ORCID: 0000-0001-6656-0180

 

Abstract

The structure and properties of deposited layers with a self-fluxing PG-10N-01 alloy of the NiCrBSi system, which is modified with composite material obtained by self-propagating high-temperature synthesis, were studied. Powders of titanium, technical carbon, refractory clay, aluminum, iron oxide, and PT-NA-01 thermosetting powder are used as the initial components of the modifying composite material. The powders were mechanically activated in a ball mill, pressed into a cylindrical sample, and then subjected to the process of self-propagating high-temperature synthesis. The deposition of the samples was carried out with a non-fusible graphite electrode with a diameter of 9.5 mm, at a current of 110 A, using an inverter power source SV-290NK. It was established that the structure of the layer deposited with the PG-10N-01 alloy consists of a solid solution based on nickel (γ-Ni) and a eutectic formed on its basis with Ni3B boride. Single inclusions of carbides of chromium Cr3C2 and boron B4C were also detected in the deposited layer. When adding a modifying composite material to the PG-10N-01 alloy, the structure of the deposited layer consists of γ-hard solution and eutectics, strengthened by carbides of titanium TiC and silicon SiC, which increase the microhardness and wear resistance of the layer. The microhardness of the layer deposited with the composite material, which contained 10% of the modifying component, is 660 HV, which exceeds the microhardness of the layer deposited with the PG-10N-01 alloy, which is equal to 510 HV. Based on the results of the research, operational tests of the set of duckfoot blades of the KPP-8 semi-trailer cultivator, aggregated with the New Holland T 6090 tractor, were carried out in the conditions of the Kamianuvatka farm (Novoukrainka district, Kirovohrad region). Based on the tests, it was proved that the relative wear resistance of duckfoot blades made of 65G steel, strengthened on the reverse side according to the “toe-working blade” scheme by depositing a layer of composite material is 1.7 times greater compared to the wear resistance of blades made by standard technology logic.

 

Keywords: self-propagating high-temperature synthesis, charge, composite material, deposition, deposited layer, carbide, structure, hardness, abrasive, wear resistance, machine parts.

 

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Received 27 November 2023

Published 30 December 2023