This work deals the phenomenon interaction of crystallization front on the particles of non-metallic precipitates. The behavior of a single particle in the vicinity of horizontal and vertical front was analyzed. The forces acting on the particle were characterized and the equilibrium condition formulated, from which the critical velocity of front may be deduced. The calculation results were illustrated in the form of graphs.Keywords: solidification front, non-metallic inclusions, forcesPraca zajmuje się zjawiskiem oddziaływania przemieszczającego frontu krystalizacji na cząstki wydzieleń niemetalicznych. Analizowano zachowanie pojedynczej cząstki wydzielenia w pobliżu poziomego i pionowego frontu. Scharakteryzowano siły działające na cząstkę w pobliżu frontu i sformułowano warunek równowagi, z którego wynika szybkość krytyczna frontu. Wyniki obliczeń zilustrowano w postaci wykresów.
Solute segregation and formation of non-metallic inclusions during the solidification of a titanium-containing steel are modeled in this paper. The Ueshima model was used to describe the partitioning of solute elements in the steel, taking account of back-diffusion into the solid. Calculations were made for solidification of an AH-36-3u steel ingot cooled at 50 or 100 K min −1 . The simulations reveal that MnS inclusions are formed first, followed by TiN, Ti2O3 and SiO2. Increased cooling rate accelerates the formation of non-metallic inclusions, but for the assumed rates of 50 and 100 K min −1 the differences in amount formed are minimal. The results of these calculations for AH-36-3u steel give an approximate picture of the distribution of inclusions in the solidified ingot structure.K e y w o r d s : segregation, ingot solidification, non-metallic inclusions, back-diffusion
Theoretical and practical research on the influence of temperature on mechanical characteristics of the composite material MM “Steel 1018” has been conducted. Both laboratory equipment used to measure of mechanical properties, the technique of material preparation and the experimental procedure were described. The analysis of the the obtained results revealed that with temperature increase the material yield point goes down.
Refining of liquid aluminium by blowing with an inert gas is one of the most effective methods of purifying liquid metal from hydrogen and non-metallic inclusions. In order to improve the efficiency of this process, it is necessary to develop a rotor design. The study compares rotors designed and their usefulness. For this purpose, the theoretical number of nozzles, the amount of gas per nozzle and the gas bubble radius were calculated.
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