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13.
Mathematical modeling of the melt cooling rate in the melt-spinning process
Karpe, Blaž ...
Rapid solidification of metallic melts is important for the development of the advance metallic materials, because enables the production of new alloys with superior properties according to ...conventionally treated alloys. In practice it turned out, that single roll melt spinning process has one of the highest melt cooling rates among all continuous casting processes. But, because very short solidification time and movement of the melt and substrate, melt cooling rate is very difficult to measure with confidence. Primary goal of our work was to determine the limits of cooling rate over the ribbon thickness and to outline, which property or typical feature of the process has the greatest influence on cooling rate of the melt. On the basis of developed mathematical model, a computer program was made and used for melt cooling rate calculation in the melt-spinning process.Our calculations show that distance from the contact surface in relation to the thermal properties of the melt, chilling wheel material and contact resistance between metal melt and chilling wheel have the greatest influence on melt/ribbon cooling rate. In the case of continuous casting, significant long term surface temperature increase may take place, if the wheel is not internally cooled. Comparison between cooling rates calculated at various thermal resistance assumptions of particular constituents is outlined. New method for determining contact resistance through variable heat transfer coefficient is introduced which takes into account physical properties of the casting material, process parameters and contact time/length between metal melt/ribbon and substrate and enables cooling rate prediction before the experiment execution.
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