Investigation of the Formation Processes of Aluminized Layers Obtained by Electrospark Alloying. Part I. Structural-Phase State of the Steel Surface after Aluminizing
V. B. Tarelnyk$^{1}$, O. P. Gaponova$^{2}$, O. M. Myslyvchenko$^{3}$
$^{1}$Sumy National Agrarian University, 160 Gerasym Kondratiev Str., UA-40021 Sumy, Ukraine
$^{2}$Sumy State University, 2 Rymsky-Korsakov Str., UA-40007 Sumy, Ukraine
$^{3}$I. M. Frantsevich Institute for Problems in Materials Science, NAS of Ukraine, 3 Academician Krzhyzhanovsky Str., UA-03142 Kyiv, Ukraine
Received: 25.02.2019; final version - 30.07.2019. Download: PDF
Peculiarities of phase formation and structural transformations at forming aluminized layers on carbon steels by electrospark alloying are considered. As shown, with increasing discharge energy the thickness and microhardness of the ‘white’ and transition layers, the surface roughness increase, the chemical and phase compositions change. At low discharge energies, a layer is formed; it predominantly consists of $\alpha$-Fe and aluminium oxides. With increasing discharge energy, the layer consists of iron and aluminium intermetallides and free aluminium, which is evidenced by the data of X-ray spectral analysis. To reduce the roughness and increase the continuity of coatings, it is recommended to carry out the electrospark alloying using the same electrode (aluminium), but at low discharge energy.
Key words: electrospark alloying, aluminizing, coating, microstructure, phase composition, microhardness, surface roughness, X-ray diffraction analysis, X-ray spectral analysis.
URL: http://mfint.imp.kiev.ua/en/abstract/v41/i10/1377.html
DOI: https://doi.org/10.15407/mfint.41.10.1377
PACS: 62.20.Qp, 68.35.Ct, 68.35.Gy, 68.55.J-, 68.55.Ln, 81.15.Rs, 81.40.Pq
Citation: V. B. Tarelnyk, O. P. Gaponova, and O. M. Myslyvchenko, Investigation of the Formation Processes of Aluminized Layers Obtained by Electrospark Alloying. Part I. Structural-Phase State of the Steel Surface after Aluminizing, Metallofiz. Noveishie Tekhnol., 41, No. 10: 1377—1394 (2019) (in Ukrainian)