Compatibility of chemical elements on grain boundaries in steel and its influence on wear resistance of steel

Колесников, В. И.; Migal, Yu. F.; Колесников, И. В.; Новиков, Е. С.

doi:10.3103/s1068366615010055

Cited by 12 publications

(4 citation statements)

References 6 publications

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“…Friction and wear are not purely phenomena that can be solely solved by simply selecting a harder material [ 4 , 5 ]. They emerge from the contact interaction between moving parts that is influenced by many factors, such as contact, load, speed [ 6 , 7 , 8 ], surface and base material hardness, elasticity, toughness, chemical reactions [ 9 ], and lubrication [ 10 ], and also the dominant environmental factors, including temperature, humidity, impurities, and radiation [ 3 , 11 , 12 , 13 , 14 , 15 , 16 ]. Some deficiencies causing friction and wear can be addressed rather easily, while others are more complicated to solve.…”

Section: Introductionmentioning

confidence: 99%

Sliding Wear Behavior of High-Temperature Vacuum-Brazed WC-Co-NiP Functional Composite Coatings

Muntean

Pascal²,

Kazamer³

et al. 2021

Materials

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The present study aimed to investigate the tribological behavior of high-temperature vacuum-brazed WC-Co-NiP functional coatings deposited on 16MnCr5 case hardening steel. Dry sliding wear resistance was evaluated using a non-conformal ball-on-disk arrangement, at room temperature against 100Cr6 and WC-Co static partners, respectively. Morphological, microstructural, and chemical composition analyses showed a complex, phased structure composed of tungsten carbide, nickel, and hard cobalt-based η-structure. In the testing conditions, the coefficient of friction against 100Cr6 and WC-Co counterparts entered a steady-state value after approximately 1000 m and 400 m, respectively. The wear track analysis revealed phenomena of particles trapped between the sliding bodies, as well as gradual removal of asperities. The calculations of the wear rates proved that the values were strongly influenced by properties of the sliding system, such as crystal structure, stress discontinuities, hardness, and material homogeneity.

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Section: Introductionmentioning

confidence: 99%

Sliding Wear Behavior of High-Temperature Vacuum-Brazed WC-Co-NiP Functional Composite Coatings

Muntean

Pascal²,

Kazamer³

et al. 2021

Materials

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“…Поэтому алюминий имеет низкий предел прочности и легко растрескивается, особенно под действием механических напряжений и в присутствии водорода, который дополнительно ослабляет связи. Слабые химические связи означают высокую скорость генерации вакансий [6,10]. Во-вторых, добавки сами должны образовывать прочные связи с атомами алюминия [10].…”

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“…Слабые химические связи означают высокую скорость генерации вакансий [6,10]. Во-вторых, добавки сами должны образовывать прочные связи с атомами алюминия [10]. В чистом алюминии каждый атом имеет 12 ближайших соседей, поэтому желательно, чтобы атом добавки образовывал прочные связи с 12 атомами алюминия, не меняя всей структуры связей и не давая этим атомам возможности мигрировать в междоузлие даже при поддержке водорода.…”

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“…В-третьих, кристаллическая решетка со встроенными атомами добавки должна быть устойчивой. Например, если общая энергия системы будет уменьшаться при сближении двух атомов добавки в кристаллической решетке алюминия, то такая структура рано или поздно перейдет в более выгодную структуру, где заметная часть атомов алюминия будет слабо связана между собой и атомами добавки [10]. Переходы таких атомов в междоузлия будут порождать вакансии, что в конечном счете приведет к растрескиванию.…”

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Анализ Водородоустойчивости Алюминиевых Сплавов

Индейцев¹,

Осипова²

2021

Письма В Журнал Технической Физики

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It was established by the methods of quantum chemistry that tungsten W and rhenium Re are the most effective additives that increase the hydrogen resistance of aluminum Al. It is shown that W and Re strongly compress aluminum, but at the same time have a rather large covalent radius. In addition, each W and Re atom form stable chemical bonds with 12 Al atoms. As a result, the W and Re atoms strongly bind Al atoms significantly increasing the energy of vacancy formation and slowing down the process of hydrogen embrittlement. All basic physical and mechanical properties of the most hydrogen-resistant aluminum compound WReAl24 have been calculated using density functional theory.

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