Abstract
Central voids or voids at the middle layer are often found in thin strips produced by twin-roll casting. These strips are in general so thin that they are unable to take a required reduction in thickness to close the voids. In the present investigation, equal-speed rolling and differential-speed rolling were compared to assess the effect of differential speed on closure of the voids by the rigid-plastic finite-element analysis. As a result, shear deformation developed in differential-speed rolling was found to reduce the reduction in thickness required for void closure. An increase in speed ratio, length of deformation zone, or friction coefficient at the interface expedited the progress in void closure. However, as the speed ratio exceeded thickness ratio, a portion of rolling power was dissipated extensively by excessive slip at the interface. Moreover, tensile stress developed which would cause cracks in the strip.
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Acknowledgments
This research was supported by Basic Science Research Program through the National Research Foundation of Korea funded by the Ministry of Education, Science and Technology (2010-0023706). The author appreciates Mr. S. Yoo and Mr. W. Huh for their assistance in preparing the manuscript.
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Manuscript submitted March 24, 2015.
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Park, JJ. Effect of Shear Deformation on Closure of a Central Void in Thin-Strip Rolling. Metall Mater Trans A 47, 479–487 (2016). https://doi.org/10.1007/s11661-015-3243-3
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DOI: https://doi.org/10.1007/s11661-015-3243-3