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Modifying the Steel Surface Layer by Compounds with High Melting Temperature Using Electric Slag Surfacing

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Abstract

The alloying effect on the structure, microhardness and abrasive wear resistance is studied for electric slag layers deposited on low-alloy 09G2S structural steel grade. The mixtures of Si3N4 + FeSi2 + Si powder obtained in the Department of Structural Macrokinetics of Tomsk Research Center (the Siberian Branch of RAS) using the method of SHS synthesis are used as modifiers. In addition, TiC-based powder compositions are applied as a modifying parameter. An electrode was made using low-alloy steel St3 to engage into arc welding. In the first experiment, the modifying compositions Si3N4 + FeSi2 + Si is covering the electrode whereas the modifying compositions Si3N4 + FeSi2 + Si is located under the electrode in the second case. The metallography and X-ray microanalysis techniques are used to determine the structure and compositions in deposited layers, in heat-affected areas and in base metal. The results are used to explain the hardness and wear-resistant coatings properties. It is shown that the main factor affecting wear-resistance deals with the structure of the metal to be deposited. A positive effect in modifying coatings using alloying materials containing Si3N4 + FeSi2 + Si and St3, TiC and St3 alloys was established. Molten layer features numerous crystallization centers represented by dispersed TiC particles. TiC dispersion particles have high melting temperature (3180°C). They are the first to fall out from the melt acting not only as multiple crystal grains, but also as a hurdle to grow austenite grains resulting in developing a dispersed structure. The coatings contain both TiC carbide particles and inclusions of other phases. An increase in hardness of the deposited layer containing inclusion of titanium carbide is observed in the direction of the base interface. The wear resistance of the layer is higher when the coating is made of TiC. The data obtained can be used to make deposited layers having high resistance to abrasive wear on the metal surface.

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Funding

The work was carried out against the Government assignment issued by ISPMS SB RAS for 2021-2023, project no. FWRW-2021-0003.

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Authors and Affiliations

  1. Institute of Strength Physics and Materials Science, Siberian Branch, RAS, 634021, Tomsk, Russia

    Yu. N. Saraev, V. P. Bezborodov, M. V. Perovskaya & V. M. Semenchuk

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  1. Yu. N. Saraev
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  2. V. P. Bezborodov
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  3. M. V. Perovskaya
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  4. V. M. Semenchuk
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Correspondence to Yu. N. Saraev, V. P. Bezborodov or M. V. Perovskaya.

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Translated by V. Vetrov

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Saraev, Y.N., Bezborodov, V.P., Perovskaya, M.V. et al. Modifying the Steel Surface Layer by Compounds with High Melting Temperature Using Electric Slag Surfacing. Steel Transl. 51, 616–620 (2021). https://doi.org/10.3103/S0967091221090102

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  • DOI: https://doi.org/10.3103/S0967091221090102

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