Abstract
In industrial casting operations, the possibility of implantation of a diversity of operational conditions has as consequence the generation of a wide range of solidification structures, affecting the mechanical properties and the quality of the final product. Due to the importance of the study of thin slabs solidification, for this work is used a system that allows the physical simulation of initial stages of continuous casting of thin slabs for laboratory experiments under several solidification conditions. Experiments were carried out using Pb-2.5% Sb alloy that presents low melting temperature and characteristic structure. For the Pb-2.5% Sb alloy thin slabs were obtained in cooled mold without reduction and with 10 and 20 mm reductions. It was found that the degree of deformation applied tends to increase the equiaxed region by the breakage of the dendrites as well as the possibility of the formation of equiaxed dendritic structures. It was observed that the deformation of this alloy directly influences the secondary dendrite spacing, tending to decrease it.
Highlights
Many industries are intensively involved developing equipment for thin slab casting, where several models differ basically in shape and size of the mold, the kind submerse valve, kind and intensity of deformation applied on the solidification region, as well as the length and thickness of hot cut slab (Hoseinifar, Salari, & Nezhad, 2016).The continuous casting process of thin slabs shows the great potential of the siderurgical industry in the development of new technologies
The use of the Pb-2.5% Sb alloy for the initial experimental work is due to its low melting temperature (TL = 314 and TS = 284°C) that, when subjected to the high cooling rate in a refrigerated metal mold, structures with unidirectional solidification characteristics can be obtained, which makes it possible to analyze the influence of the deformation on thin slabs when the core is still in the liquid state
It is noticed that the beginning of solidification at the center of the thin slab occurred 30 seconds after the solidification front passed through the 15 mm position
Summary
Many industries are intensively involved developing equipment for thin slab casting, where several models differ basically in shape and size of the mold, the kind submerse valve, kind and intensity of deformation applied on the solidification region, as well as the length and thickness of hot cut slab (Hoseinifar, Salari, & Nezhad, 2016). The quality and mechanical performance of cast metal parts depend on the combination of several parameters simultaneously, such as grain size, dendritic spacing, lamellar or fibrous spacing, heterogeneities in chemical composition, size, shape and distribution of inclusions, formed porosities etc All these factors can somehow be manipulated during the solidification process to obtain pieces in accordance with the numerous requirements of the market. To the process of continuous casting of thin plates, the knowledge of the structural behavior of the material in the initial stages (including the passage through the mold and extraction rollers) has fundamental importance, since it will directly influence the quality of the final product, as well as the importance of the Lead-Antimony alloys in various applications in the metalmechanical industry. This work has as main objective to analyze the effect of the deformation during the solidification process of thin slabs with the liquid core, in the formation of the microstructure and thermal parameters
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