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Закономерности изнашивания титановых сплавов ПТ-3В и ВТ6 с крупнозернистой и ультрамелкозернистой структурой

Закономерности изнашивания титановых сплавов ПТ-3В и ВТ6 с крупнозернистой и ультрамелкозернистой структурой

Abstract

Актуальность работы обусловлена необходимостью повышения триботехнических характеристик титановых сплавов с целью расширения сферы их применения. Цель работы: изучение закономерностей изнашивания титановых сплавов ПТ-3В и ВТ6 с крупнозернистой и ультрамелкозернистой структурой при трении с граничной смазкой. Выявление наиболее значимых параметров ультрамелкозернистой структуры, влияющих на износостойкость сплавов ПТ-3В и ВТ6. Определение наиболее оптимальных режимов abc-прессования, обеспечивающих формирование ультрамелкозернистой структуры с параметрами, максимально повышающими износостойкость сплавов ПТ-3В и ВТ6. Методы исследования: рентгеновский структурно-фазовый анализ с излучением CoK α, оптическая металлография, методы растровой и просвечивающей электронной микроскопии, метод микрорентгеноспектрального анализа, метод дифракции обратнорассеянных электронов (ДОЭ) с использованием программного обеспечения CHANNEL 5. Результаты: формирование в сплавах ПТ-3В и ВТ6 ультрамелкозернистой структуры с использованием методов интенсивной пластической деформации не изменяет адгезионного механизма изнашивания этих сплавов. Изнашивание сплавов ПТ-3В и ВТ6 как с крупнозернистой, так и с ультрамелкозернистой структурой происходит в результате адгезионного переноса материала образцов на контртело и образования большого количества частиц изнашивания. При формировании высоконеравновесной структуры именно неравновесность структуры оказывает определяющее влияние на его сопротивление изнашиванию.

Relevance of the work is caused by the need to improve the tribological characteristics of titanium alloys in order to expand their application. The main aim of the research is to study the regularities of wear of titanium alloys PT-3V and VT6 with coarse and ultrafine grained structure in friction with boundary lubrication; to identify the most significant parameters of ultrafine grained structure that influence wear resistance of alloys PT-3V and VT6; to determine the most optimal regimes of abc-pressing, ensuring the formation of ultrafinegrained structure with parameters increasing the wear resistance of alloys PT-3V and VT6. The methods used in the study: X-ray structural and phase analysis with radiation CoK α, optical metallography, methods of scanning and electron microscopy, electron microprobe analysis method, electron backscatter diffraction method (EBSD) using software CHANNEL 5. The results: the formation in alloys PT-3V and VT6 with ultrafine-grained structure by the methods of severe plastic deformation does not alter the adhesive wear mechanism of these alloys. The wear of alloys PT-3V and VT6 with coarse-grained and ultrafine-grained structure is the result of an adhesive transfer of samples material to a counterbody and formation of a large number of wear particles. When forming a highly nonequilibrium structure it is the nonequilibrium of the structure which has a decisive influence on its wear resistance.

Keywords

ТИТАНОВЫЕ СПЛАВЫ, ЗАКОНОМЕРНОСТИ ИЗНАШИВАНИЯ, УЛЬТРАМЕЛКОЗЕРНИСТАЯ СТРУКТУРА, НЕРАВНОВЕСНОСТЬ СТРУКТУРЫ, ДИФРАКЦИЯ ОБРАТНОРАССЕЯННЫХ ЭЛЕКТРОНОВ

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
Average
Average