Keyword: «wear»

In this paper, the processes of structure formation during gas-thermal electric arc metallization with powder wire are considered. The basic composition of the charge is nickel alloy PGSR-4. Niobium powders were selected as modifying additives, the content of which in the charge of powder wires is: 0.1%, 0.3%, 1% and 5% by weight. The influence of niobium content on carbide formation, on the ratio of structural components, on the formation of oxide phases, and the dispersion of the surfacing microstructure are shown. Tribological studies have shown that the wear of samples decreases by an order of magnitude, starting with the addition of 0.3% niobium. With a niobium content of 1% and 5% in the powder wire, the wear resistance remains high, but the mass losses of the samples and the counterbody are balanced, which is due to the grinding of the microstructure and an increase in the uniformity of micromechanical properties.

This article presents the results of wear tests at low climatic temperatures of a modified coating made of flux-cored wire with aluminum oxide and a metal counterbody made of ShKh15 steel. The data of temperature changes, roughness parameters and friction surface profiles are shown. The results of comparative studies of the wear of a modified coating and a metal counterbody are presented and analyzed.

The climate and mining conditions of Yakutia (temperature fluctuations, vibrations, shock loads) cause accelerated wear of quarry equipment. A study on bulldozers identified the most vulnerable components: ripper tips/shanks and the crawler system. Laboratory analysis of tips from various manufacturers revealed a direct correlation between wear resistance and both hardness and low-temperature impact toughness. Forged tips demonstrated the best results. Practical solutions include developing special material requirements for the Arctic and implementing hardfacing technology. This has allowed Almazy Anabara to significantly reduce annual tip consumption and improve operational efficiency.

The study is devoted to solving the problems of abrasive wear of mining equipment parts operating in harsh Arctic conditions. The effectiveness of surfacing with direct current and modulated current was compared. It was found that the use of pulsed-arc technology reduces the burn-off of alloying elements in the melt. This ensures better transfer of the electrode's chemical composition to the surfacing layer and targeted adjustment of its properties. The results showed that the influence of the technology on the coating hardness varies depending on the composition of the surfacing material, confirming its potential for managing the quality of restoration of critical components.

The article presents the results of studies of the composition, properties and structure of the bushing and pin of the rear spring of a truck operated in low-temperature climatic conditions of the North. The levels of hardness and microhardness of the hardened layer and the central part of the pin are determined. The surface profiles of worn parts before and after operation are shown.