Issues »  Volume 43, Issue 7

Effect of Copper on Formation of Wear-Resistant Ultradispersed and Nanostructured Surface Layers of Friction of Chromium Steels

V. V. Tykhonovych$^{1}$, O. M. Grуpachevskуi$^{1}$, V. G. Novytskyi$^{2}$

$^{1}$G. V. Kurdyumov Institute for Metal Physics, NAS of Ukraine, 36 Academician Vernadsky Blvd., UA-03142 Kyiv, Ukraine
$^{2}$Physico-Technological Institute of Metals and Alloys, NAS of Ukraine, 34/1 Academician Vernadsky Blvd., UA-03142 Kyiv, Ukraine

Received: 02.03.2021. Download: PDF

The effect of introducing structurally free copper inclusions ($\varepsilon$-phase) into X120Cr15 steel on the mechanism of formation of wear-resistant ultradispersed coatings on friction surfaces is studied. Steel X120Cr15 is alloyed with 10% wt. Cu (X120Cr15Cu10). The formation of wear-resistant ultradispersed coatings on the friction surfaces leads to the transition of the friction pair steel X120Cr15–steel X20Cr13 into a stationary operating mode with the minimum friction coefficient and wear. The study shows that these coatings consist of separate layers. These layers are the result of the layering of metal microprotrusions on the friction surface. These microprotrusions are formed during the breaking-in of friction units as a result of the local metal destruction and its transfer between bodies. As established, the alloying of X120Cr15 steel with 10% wt. Cu does not change the structure and phase composition of the initial alloy, but additionally, $\varepsilon$-Cu phase inclusions appear. Depending on the inclusion’s size, $\varepsilon$-Cu phases have different origins and are formed from a liquid melt, austenite, and ferrite. The mechanism of influence of additional alloying of steel X120Cr15 with copper on the increase of the alloy’s hardness and elasticity is studied. As established, the effect of copper on the hardness and elasticity of X120Cr15Cu10 steel increases during plastic deformation of the alloy due to the destruction of the network of the eutectic component, grinding, and partial dissolution of inclusions of the $\varepsilon$-Cu phase. The study shows that additional alloying of X120Cr15 steel with copper reduces the difference between the mechanical properties of the bodies forming friction units. Therefore, in the working pair of steel X120Cr15–steel X20Cr13, the friction layers are mainly formed from the metal of steel X120Cr15, and in the working pair of steel X120Cr15Cu10–steel X20Cr13, the contribution of both bodies to the formation of friction layers does not differ much. It leads to more uniform wear of the friction pair bodies and a drop in its total wear.

Key words: sliding friction, wear resistance, nanostructured material, ultradispersed structure, inclusion of $\varepsilon$-Cu phase, surface layers of friction, mass transfer.

URL: https://mfint.imp.kiev.ua/en/abstract/v43/i07/0853.html

DOI: https://doi.org/10.15407/mfint.43.07.0853

PACS: 06.60.Vz, 62.20.Qp, 62.25.-g, 68.35.Ct, 81.07.Bc, 81.16.Rf, 81.40.Pq

Citation: V. V. Tykhonovych, O. M. Grуpachevskуi, and V. G. Novytskyi, Effect of Copper on Formation of Wear-Resistant Ultradispersed and Nanostructured Surface Layers of Friction of Chromium Steels, Metallofiz. Noveishie Tekhnol., 43, No. 7: 853—886 (2021) (in Ukrainian)

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