Browsing by Author "Nishi, Tsuyoshi"

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    GRK 2802: Densities, Surface Tensions, and Viscosities of Molten High-Silicon Electrical Steels with Different Silicon Contents
    (Technische Universität Bergakademie Freiberg, 2025-10-24) Neubert, Lukas; Bellé, Matheus Roberto; Yamamoto, Taisei; Nishi, Tsuyoshi; Yamano, Hidemasa; Ahrenhold, Frank; Volkova, Olena
    Density, surface tension, and viscosity of various liquid electrical steels are measured at different temperatures, varying in their silicon content between 3 and 6mass%. Density and surface tension are determined using the maximum bubble pressure method, while viscosity is investigated comparatively using a vibrating finger viscometer and an oscillating crucible viscometer. The results are compared with models known from the literature. Based on this, the density of the steel [ρ] = kgm 3 and the surface tension [σ] =Nm 1 can be described as a function of temperature [θ] = °C and silicon content [Si] =mass% using the equations: ρðθ, SiÞ ¼ 1.28 θ 104.18 Si þ 9081.8, σðθ, SiÞ ¼ 10 4 ½ 0.00903 θ2 1.21494 Si2 þ 29.268 θ 1.987 Si 22334 . There is a lack of experimental data in the literature for high-temperature thermophysical properties for electrical steels. This underlines once again the novelty and significance of this study, as the determined thermophysical properties are essential for a wide range of applications. For instance, they are crucial in the production of metallic powders for additive manufacturing by atomization to adjust the properties of the powders precisely. The findings are also important for steelmaking itself, as the corrosion behavior of refractory material can be better determined.
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    GRK2802: Density, Surface Tension and Viscosity of Liquid Low-Sulphur Manganese-Boron Steel via Maximum Bubble Pressure and Oscillating Crucible Methods
    (Technische Universität Bergakademie Freiberg, 2026-04-27) Bellé, Matheus Roberto; Neubert, Lukas; Sherstneva, Anastasiia; Yamamoto, Taisei; Nishi, Tsuyoshi; Yamano, Hidemasa; Weinberg, Matthias; Volkova, Olena
    This study investigates the thermophysical properties of low-sulphur manganese-boron steel with varying boron and sulphur contents at different temperatures. Density and surface tension were measured between 1550-1650 °C using the Maximum Bubble Pressure (MBP) method, while viscosity was examined between 1530-1570 °C using an improved Oscillating Crucible Viscometer (OCV). The methods yielded results with low error, consistent with existing literature. The density of the base steel decreased from 7057 ± 25 kg m-3 at 1550 °C to 6843 ± 85 kg m-3 at 1650 °C. The addition of boron (up to 57 ppm) and sulphur (up to 130 ppm) did not significantly change the density. Sulphur, increasing from 39 ppm to 130 ppm, reduced the surface tension from 1416 ± 12 mN m-1 to 1302 ± 9 mN m-1 at 1650 °C. Boron’s effect on surface tension varied, possibly influenced by other elements like oxygen. Viscosity ranged from 5.74 to 6.44 mPa s, with boron and sulphur additions causing minimal changes, the largest deviation being 8%. These results provide valuable data for the simulation, modelling, control, and optimization of liquid steel processing.