Laser surface alloying

Draper, Clifton W.; Poate, J. M.

doi:10.1179/imtr.1985.30.1.85

Cited by 37 publications

(15 citation statements)

References 76 publications

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“…Laser alloying is a material-processing method that utilizes the high power density available from focused laser sources to melt metal coatings and a portion of the underlying substrate [402]. Since the melting occurs in a very short time and only at the surface, the bulk of the material remains cool, thus serving as an infinite heat sink.…”

Section: Future Perspectivesmentioning

confidence: 99%

“…What makes laser surface alloying both attractive and interesting is the wide variety of chemical and microstructural states that can be retained because of the repaid quench from the liquid phase. The types of observed microstructures include extended solid solutions, metastable crystalline phases and metallic glasses as an amorphous metal [402,403]. Alloy production with a wide variety of elements, as well as a wide range of compositional content, can also be accomplished by a mechanical alloying or powder metallurgy, both of which do not involve liquids (in other words, in solid state fabrication).…”

Section: Future Perspectivesmentioning

confidence: 99%

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Dental Implant Systems

Oshida

Tuna

Aktören

et al. 2010

IJMS

174

115

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Among various dental materials and their successful applications, a dental implant is a good example of the integrated system of science and technology involved in multiple disciplines including surface chemistry and physics, biomechanics, from macro-scale to nano-scale manufacturing technologies and surface engineering. As many other dental materials and devices, there are crucial requirements taken upon on dental implants systems, since surface of dental implants is directly in contact with vital hard/soft tissue and is subjected to chemical as well as mechanical bio-environments. Such requirements should, at least, include biological compatibility, mechanical compatibility, and morphological compatibility to surrounding vital tissues. In this review, based on carefully selected about 500 published articles, these requirements plus MRI compatibility are firstly reviewed, followed by surface texturing methods in details. Normally dental implants are placed to lost tooth/teeth location(s) in adult patients whose skeleton and bony growth have already completed. However, there are some controversial issues for placing dental implants in growing patients. This point has been, in most of dental articles, overlooked. This review, therefore, throws a deliberate sight on this point. Concluding this review, we are proposing a novel implant system that integrates materials science and up-dated surface technology to improve dental implant systems exhibiting bio- and mechano-functionalities.

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Section: Future Perspectivesmentioning

confidence: 99%

Section: Future Perspectivesmentioning

confidence: 99%

Dental Implant Systems

Oshida

Tuna

Aktören

et al. 2010

IJMS

174

115

View full text Add to dashboard Cite

show abstract

“…Laser surface modification of materials by melting, annealing and alloying is receiving ever increasing attention among the materials scientists and corrosion engineers as it would improve the corrosion, mechanical and physical properties of the surface of the components without affecting the bulk properties[18, 19, 20, 21, 22]. The process is simple, easy to operate, does not require any special atmosphere, no limitation in the size of the component, and produces novel microstructures.…”

Section: Introductionmentioning

confidence: 99%

Laser surface melting for improving intergranular corrosion resistance of cold‐worked and sensitised type 316 stainless steel

Mudali

Dayal

Goswami

1998

Anti-Corrosion Methods and Materials

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This study used laser melting techniques to improve the intergranular corrosion resistance of cold worked and sensitised stainless steel surfaces. Type 316 stainless steel specimens, cold worked to 5 per cent, 10 per cent and 20 per cent reductions in thickness values, were sensitised at 923K for 25 hours. These specimens were laser‐surface‐melted by using a 300W Nd:YAG pulsed laser, and tested according to ASTM A262 practice A and practice E tests. The results of the practice A test showed that a cellular‐dendritic structure was present in the laser‐melted region in contrast to a typical ditch microstructure observed for sensitised unmelted specimens and a ditch structure was not present in the melt‐affected zone (MAZ). The hardness measurements across the melted, MAZ, and unmelted zones showed significant variations in their values. The results of the practice E tests showed no intergranular cracks for laser‐melted specimens while the unmelted specimens (5 and 10 per cent cold working) failed the test through significant cracking. The improvement in IGC resistance is attributed to the dissolution of M23C6 carbides and the homogenisation of chromium‐depleted regions.

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“…Отсутствие нитридов титана обусловлено, очевидно, малой его концентрацией. После пяти циклов легирования наряду с нитридом хрома CrN в стали присутствуют нитриды титана (TiN , 4 Fe N , 0,5 0,5 Ti Cr N , 0,61 TiN ). Следует отметить, что независимо от количества циклов легирования (концентрации титана в поверхностном слое) после пяти часов азотирования в образцах формируется поверхностный слой, образованный либо нитридами хрома и железа (1 цикл легирования), либо нитридами хрома и титана (5 циклов легирования).…”

Section: материал и методики исследованияunclassified

“…[1,2]. Одним из методов получения поверхностного сплава является нанесение на поверхность образца однокомпонентной или многокомпонентной пленки и последующее жидкофазное перемешивание компонентов пленки и подложки, используя лучи лазера [3], импульсные электронные пучки [1,4], потоки плазмы [5]. Дополнительное повышение механических и трибологических характеристик материала возможно путем насыщения поверхностного сплава атомами газовых элементов (азот, кислород, углерод).…”

Section: Introductionunclassified

Phase Formation in High-Chromium Steel Under Electron-Ion-Plasma Treatment

Иванов¹,

Klopotov²,

Лопатин³

et al. 2022

Physical and Chemical Aspects of the Study of Clusters, Nanostructures and Nanomaterials

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Осуществлено поверхностное легирование методом одноциклового и многоциклового (5 циклов «напыление-облучение» в каждом цикле толщина пленки титана 0,5 мкм) высокоскоростного плавления системы «пленка (Ti)/(сталь 20X23H18) подложка» импульсным электронным пучком. Азотирование (793 К; 1, 3 и 5 час.) проводили в условиях реализации элионного (электронного и ионного) режима обработки. Рассмотрены изотермические сечения тройных систем диаграммы состояния сплава Cr - Fe - Ni - Ti - N, формирующегося на различных стадиях комплексной обработки стали. Исследования показали, что, во-первых, облучение стали импульсным электронным пучком сопровождается формированием структуры высокоскоростной ячеистой кристаллизации твердого раствора на основе γ - Fe; во-вторых, азотирование стали в исходном состоянии сопровождается формированием нитридов железа FeN и хрома CrN суммарным содержанием 79,8 масс.%; в-третьих, предварительное облучение стали импульсным электронным пучком приводит к снижению скорости нитридообразования при последующем азотировании; суммарное содержание нитридов 53 масс.%; в-четвертых, независимо от количества циклов легирования (концентрации титана в поверхностном слое) после пяти часов азотирования в образцах формируется поверхностный слой, образованный нитридами хрома и железа (1 цикл легирования) или нитридами хрома и титана (5 циклов легирования). The surface alloying was carried out by single-cycle and multi-cycle (5 cycles «sputtering-irradiation», in each cycle the thickness of the titanium film 0,5 µm), i.e. high-speed melting of the system «film (Ti)/(steel AISI 310S) substrate» by pulsed electron beam. Nitriding (793 K; for 1, 3 and 5 hours) was carried out under conditions of realization of the elion (electron and ion) treatment mode. The isothermal cross sections of the ternary systems of the state diagram of the Cr - Fe - Ni - Ti - N alloy formed at different stages of the complex treatment of steel are considered. It is shown that (1) irradiation of steel by a pulsed electron beam is accompanied by the formation of a structure of high-speed cellular crystallization of solid solution based on γ-Fe; (2) nitriding of steel in the initial state is accompanied by formation of nitrides of iron FeN and chrome CrN with a total content of 79,8 wt.%; (3) pulsed electron-beam pre-irradiation of steel leads to a decrease in the rate of nitride formation during subsequent nitriding; the total nitride content of 53 wt.%; (4) regardless of the number of alloying cycles (titanium concentration in the surface layer) after five hours of nitriding in the samples formed a surface layer of nitrides of chromium and iron (1 cycle of doping) or nitrides of chromium and titanium (5 cycles of doping).

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Laser surface alloying

Cited by 37 publications

References 76 publications

Dental Implant Systems

Dental Implant Systems

Laser surface melting for improving intergranular corrosion resistance of cold‐worked and sensitised type 316 stainless steel

Phase Formation in High-Chromium Steel Under Electron-Ion-Plasma Treatment

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