Перегляд за Автор "Shapovalov, V.O."

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  • Ескіз
    Документ
    Chemical Non-Uniformity of the Rolling Mill Metal Roll Made of 70kh3gnmf Steel
    (Хмельницький національниий університет, 2025-12) Zlyhoriev, K.V.; Biktahirov, F.K.; Shapovalov, V.O.; Veretilnyk, O.V.
    The results of studies on the chemical composition of the rolling mill roll neck section, which corresponds to the upper part of the 48-ton 70Kh3GNMF steel ingot from which the roll was manufactured, are presented. It was determined that the carbon content across the entire cross-section of the roll exceeds the upper allowable limit (0.75 %) for 70Kh3GNMF steel. The highest content of carbon (about 1 wt.%), sulfur (up to 0.053 wt.%), and phosphorus (up to 0.023 wt.%) is observed at a distance of approximately 1/3 of the radius from the roll surface. Due to the resulting decrease in metal strength, this caused the formation of defects in the form of cracks in these areas during the ingot forging. The necessity of applying external influences to reduce segregation in the steel ingot, particularly heating and metal stirring, is noted.
  • Ескіз
    Документ
    Investigation of the Solidification Behaviour of 40cr Steel Ingots Under Metal Heating and Stirring
    (Хмельницький національниий університет, 2025-12) Biktahirov, F.K.; Shapovalov, V.O.; Barabash, V.V.; Hnatushenko, O.V.; Ihnatov, A.P.
    To eliminate shrinkage defects in large steel ingots, a method of external influence combining electroslag heating and metal stirring during solidification has been proposed. Laboratory-scale experimental melts were carried out to produce 120 kg ingots of 40Cr steel. Longitudinal templates were cut from the obtained ingots, followed by macroscopic structure analysis, tensile tests and Brinell hardness measurements. The conducted studies demonstrate the elimination of shrinkage defects and an improvement in the physical homogeneity of the ingot as a result of the combined external influence, indicating the promise of this approach.
  • Ескіз
    Документ
    The Influence of Metal Heating and Stirring on the Conditions of Steel Ingot Solidification
    (Хмельницький : ПП Заколодний М.І., 2023-12) Barabash, V.V.; Biktahirov, F.K.; Shapovalov, V.O.; Hnatushenko, O. V.
    The paper results from both physical modeling and full-scale experiments with liquid steel demonstrate that active control of crystallization processes during ingot manufacturing is achievable through the combination of steel heating and stirring the liquid core of steel ingots. This discovery unveils new possibilities for producing large, high-quality ingots.