Laser surface hardening and electric-spark surface hardening of materials

Коваленко, В. С.; Verkhoturov, A. D.; Головко, Леонід Федорович; Podchernyaeva, I. A.

doi:10.1007/bf01120344

Cited by 14 publications

(6 citation statements)

References 8 publications

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“…The advantages of these technologies are that this type of processing leads to the fact that a wear-resistant modified layer with a low coefficient of friction is formed on the working surface. Along with traditional methods of modification, laser hardening technologies are widely considered and are applied in practice, especially in the automotive industry [5][6][7]. In the aviation industry, their knowledge is limited and of great practical importance.…”

Section: General Provisions Statement Of the Research Taskmentioning

confidence: 99%

Laser Modification of the "Ring-Cylinder Liner" Mating Surfaces

Shastin

Kargapoltsev

2020

KEM

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The article focuses on the topical issues of studying the microstructure, physical-and-mechanical and tribological parameters of the surface layers of a “ring-cylinder liner” friction pair subjected to laser processing. The analysis of the main defects of the elements of the cylinder-piston group of the internal combustion engine, methods for their recovery and increase of tribotechnical characteristics has been carried out. It is noted that the most effective means of increasing the wear resistance of the “ring-cylinder liner” friction pair are various types of heat and chemical-heat treatment of the working surface of the link. As a result of tribological studies, it was found that there is an increase in the wear resistance of a “ring – cylinder liner” friction pair in all the investigated laser exposure modes, taking into account the identified boundary processing conditions for one and the other interfacing elements. The maximum value of wear resistance is observed during laser thermal strengthening of both mating surfaces, at critical levels of laser energy density, which do not cause melting and microcracks in the surface layer. In this case, the wear resistance of the modified surface of the cylinder liner can increase 4.5...5 times, and more than three times for the piston rings.

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Section: General Provisions Statement Of the Research Taskmentioning

confidence: 99%

Laser Modification of the "Ring-Cylinder Liner" Mating Surfaces

Shastin

Kargapoltsev

2020

KEM

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“…The degree of heterogeneity of the structure formed as a result of laser heating also depends on the level of dispersion. Grinding of blocks, an increase in the density of dislocations, and an increase in stresses in the crystal lattice [1][2][3] occurs for most iron-carbon alloys. This is obviously the reason for the increase in the physical and mechanical properties of the modified layer, namely, an increase in the microhardness index, corrosion resistance, wear resistance, etc.…”

Section: Introductionmentioning

confidence: 99%

“…Their practical use may be limited or little justified, due to the need for additional finishing to restore the required surface roughness, especially for mating parts with regulated tolerances and fits. In this case, the depth of the hardened layer with respect to the first mode of "thermal strengthening" can be significantly greater (2...5 times) [2,6]. The physical and mechanical properties of the modified material by the depth of the heat-affected zone (HAZ) also exceed these indicators in comparison with the first processing mode.…”

Section: Introductionmentioning

confidence: 99%

Laser Modification: Increasing the Wear Resistance of Friction Surfaces

Shastin

Kargapoltsev

2020

KEM

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The article deals with topical issues of studying the physical, mechanical and tribological parameters of the surface layer of machine parts subjected to laser processing. Various options for modifying mating surfaces are evaluated and analyzed. The data of microstructural analysis and indicators of wear resistance are presented. A theoretical model of the wear of heat-strengthened surfaces is proposed, explaining the mechanism for increasing their wear resistance as a result of homogenization of the microstructure of a special surface layer with increased bearing capacity. It is experimentally confirmed that the greatest wear resistance is observed in friction units during mutual modification of mating surfaces.

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“…Обработ-ку концентрированными потоками энергии (КПЭ) проводят, как правило, с целью повышения таких поверхностно чувствительных свойств как твёрдость, износо-и жаростойкость [1][2][3][4][5][6][7][8].…”

Section: Introductionunclassified

Structure, Phase Composition and Properties of Surface Layers of the Titanium after Electroexplosive Doping with Yttrium and Electron-Beam Processing

et al. 2015

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Проведено модифицирование поверхностного слоя технически чистого титана комбинированным методом, сочетающим электровзрывное леги-рование иттрием и последующее облучение высокоинтенсивным элек-тронным пучком с параметрами: плотность энергии пучка электронов -20-70 Дж/см 2 , длительность импульса -150 мкс, количество и частота следования импульсов -3 и 0,3 Гц соответственно. Методами современ-ного физического материаловедения (рентгеноструктурный анализ, оп-тическая, сканирующая и просвечивающая электронная дифракционная микроскопия, измерения твёрдости, микротвёрдости, коэффициента тре-ния и скорости изнашивания) выполнены исследования элементного и фазового составов, дефектной субструктуры, механических и трибологи-ческих характеристик легированного слоя. Выявлено формирование мно-гослойной многофазной субмикро-и нанокристаллической структуры, характеризующейся расслоением материала по титану и иттрию. По-верхностный слой толщиной 500 нм является аморфным. Ниже распола-гается слой толщиной 1,0-1,5 мкм, имеющий столбчатое строение. Под ним выявляется протяжённый (30-40 мкм) слой со структурой дендрит-ной (глобулярной) кристаллизации. Аморфный слой обогащён титаном, а лежащий под ним слой со столбчатой структурой -иттрием. Основной фазой поверхностного слоя является -иттрий (объёмная доля -73%), а объёмная доля других фаз существенно меньше (-титана -10%, карби-да TiC и оксида титана TiO 2 -14%, оксида иттрия Y 2 O 3 -3%). Насыще-ние поверхностного слоя титана атомами иттрия, кислорода и углерода Успехи физ. мет. / Usp. Fiz. Met. 2015, т. 16, сс. 175-227 Îòòèñêè äîñòóïíû íåïîñðåäñòâåííî îò èçäàòåëÿ Ôîòîêîïèðîâàíèå ðàçðåøåíî òîëüêî â ñîîòâåòñòâèè ñ ëèöåíçèåé 2015 ÈÌÔ (Èíñòèòóò ìåòàëëîôèçèêè èì. Ã. Â. Êóðäþìîâà ÍÀÍ Óêðàèíû) Íàïå÷àòàíî â Óêðàèíå.

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Laser surface hardening and electric-spark surface hardening of materials

Cited by 14 publications

References 8 publications

Laser Modification of the "Ring-Cylinder Liner" Mating Surfaces

Laser Modification of the "Ring-Cylinder Liner" Mating Surfaces

Laser Modification: Increasing the Wear Resistance of Friction Surfaces

Structure, Phase Composition and Properties of Surface Layers of the Titanium after Electroexplosive Doping with Yttrium and Electron-Beam Processing

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