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Please use this identifier to cite or link to this item: http://hdl.handle.net/11375/26634
Title: Calculation of initial stage of solidified shell deformation during γ to δ transformation in mold.
Authors: Furumai, Kohei
Zurob, Hatem
Phillion, Andre
Department: Materials Science and Engineering
Keywords: continuous casting;delta to gamma transformation;air gap;hypo-peritectic steel;uneven mold flux infiltration;uneven solidification;longitudinal crack
Publication Date: 2019
Publisher: ISIJ International
Abstract: Solidification shell deformations within the mold during continuous casting have been calculated in order to clarify the influence of mold flux infiltration variability on the cooling rate, the width of the low heat flux region, the height of the air gap, the unevenness of the solidified shell, and the resulting strain in the solidified shell. A sequentially coupled thermal-mechanical finite element model has been developed to perform the calculations. The simulation includes heat transfer and shell deformation in a growing solidified shell, along with the delta-to-gamma transformation. Further, it takes into account the effects of variability in mold flux infiltration and air gap formation on heat transfer into the mold, as well as the effect of cooling rate on the thermal expansion resulting from delta-to-gamma transformation. The results show that mild cooling and a small region of low heat flux (i.e. low variability in mold flux infiltration) strongly decrease the height of the air gap, the unevenness in the solidified shell and the strain in the solidified shell. It is confirmed that it is important to optimize the cooling rate and prevent the variation in mold flux infiltration, especially near region of δ to γ transformation, in order to minimize longitudinal crack formation.
URI: http://hdl.handle.net/11375/26634
Identifier: https://doi.org/10.2355/isijinternational.ISIJINT-2019-223
Appears in Collections:Materials Science and Engineering Publications

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