Structural and phase transformations on spark-laser coatings under fretting corrosion in air

Panashenko, V. M.; Podchernyaeva, I. A.; Духота, Олександр Іванович; Panasyuk, A. D.

doi:10.1007/s11106-012-9405-6

Cited by 3 publications

(2 citation statements)

References 6 publications

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“…The analysis of causes of wear and technological methods of hardening surface treatment of friction parts shows that in many cases the problem of increasing their wear resistance is solved by modifying the working surfaces by electrospark alloying (ESA) [6][7][8][9][10][11]. This method, characterized by technological simplicity and low power consumption, allows to form on metal substrate surface-strengthened layers with high wear resistance and the strength of adhesion of the deposited coating with the base.…”

Section: Introductionmentioning

confidence: 99%

Application of AlB$_{12}$–Al Electric Spark Coatings to Protect Titanium Alloys During Wear Under Fretting Corrosion

Umanskyi¹,

Духота²,

Shelud’ko³

et al. 2022

Metallofiz. Noveishie Tekhnol.

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The article deals with the study of the possibility of using AlB12-50 wt.% Al aluminium-matrix composite material electric spark (ES) coatings to protect titanium alloys during wear under fretting. Fundamental possibility of such coatings obtaining is estimated by theoretical calculation of Palatnik's criterion (1.22). Thermal conductivity coefficient and heat capacity of the composite were calculated or determined from an experiment. The coatings were deposited on ALIER-52 setup. Fretting corrosion tests were carried out on MFK-1 setup according to 'the coating-counterbody' system (counterbodyhardened Steel 45). Phase composition of the coating was studied with DRON-3M diffractometer and elemental x-ray spectrum analysis of the friction track surface was carried out using a JEOL JAMP9500F (SEM) microanalyzer equipped with an energy-dispersive x-ray microanalysis. The following phases namely TiB2, Ti aluminides, Ti, TiO, TiO2 and AlB10 were revealed by x-ray analysis in the coating. The absence of the AlB12 phase is noteworthy. It can be explained by thermal-oxidative destruction of aluminium dodecaboride under severe conditions of ES alloying (ESA). Regardless of the deposition mode, the wear of the sample with ES-coating is shown to be significantly less than that of the uncoated one. A conclusion is made about the prospect of using this electrode material for ESA of titanium alloys operating

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Section: Introductionmentioning

confidence: 99%

Application of AlB$_{12}$–Al Electric Spark Coatings to Protect Titanium Alloys During Wear Under Fretting Corrosion

Umanskyi¹,

Духота²,

Shelud’ko³

et al. 2022

Metallofiz. Noveishie Tekhnol.

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“…are developing quite intensively. Combined methods make it possible to form surface layers with the required mechanical properties and significantly increase the contact strength and wear resistance of components in friction couples [9][10][11][12][13][14][15][16][17][18]. Therefore, it is relevant to determine the effectiveness of improving the wear resistance of heavy-loaded parts in tribomechanical systems by a combined laser-thermochemical treatment method.…”

Section: Introductionmentioning

confidence: 99%

Improving the wear resistance of heavy-duty elements in tribomechanical systems by a combined laser-thermochemical processing method

Киндрачук

Духота

Тіsov

et al. 2021

EEJET

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This paper reports an analysis of the state of tribological support in the aviation industry. The use of surface strengthening technologies to extend the resource of friction node parts has been prioritized. Modern combined technologies of nitriding and laser treatment of steel surfaces have been reviewed. The mechanism has been elucidated that damages steel 30H2NVFA in the jackscrew actuator of transport aircraft flaps, which occurs due to insufficient surface hardness of the material after a generally accepted heat treatment. Auger electron spectroscopy analysis revealed a high concentration of oxygen on the surface: up to 41.4 at. %; the friction surface carbonation has been detected, especially significant at the surface of the pitting damage. A comprehensive technology of surface strengthening by nitriding+laser selective hardening has been suggested. The radiation power was 1 KW, the diameter of the focus spot was 2.5 mm, and the pitch between the focus spot centers was 2.5 mm. The total area of laser processing was 70 %. The steel temperature exceeded Ас3 and corresponded to the hardening temperature range. The depth of the nitrided layer increased to 400 µm, the maximum hardness on the surface was 1,350–1,380 HV0.2. The formation of a solid nitrided layer with a thickness of 200‒250 µm was observed, as well as a transition zone composed of column-shaped iron nitrides, which are introduced into the matrix material. As a result, a sharp gradient in the mechanical properties disappears. The tests confirmed that the wear resistance of the comprehensively treated surface was 2.1 times higher under dry friction conditions, and 4.5 times higher when lubricated with the "Era" grease (RF), compared with the 30H2NVFA steel nitrided by the conventional technology. In addition, there was no fragile destruction of the surface; the interaction with oxygen reduced significantly

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Ceramics and Cermets Based on Nonoxide Refractory Compounds

Grigor'ev

2013

Powder Metall Met Ceram

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Structural and phase transformations on spark-laser coatings under fretting corrosion in air

Cited by 3 publications

References 6 publications

Application of AlB$_{12}$–Al Electric Spark Coatings to Protect Titanium Alloys During Wear Under Fretting Corrosion

Application of AlB$_{12}$–Al Electric Spark Coatings to Protect Titanium Alloys During Wear Under Fretting Corrosion

Improving the wear resistance of heavy-duty elements in tribomechanical systems by a combined laser-thermochemical processing method

Ceramics and Cermets Based on Nonoxide Refractory Compounds

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