Abstract
A homogenized (to remove segregation effects from continuous casting) 0.046 wt pct Nb-microalloyed steel was used to examine the validity of the Dutta–Sellars equation in describing the degree of recrystallization, grain size distributions, and the influence of precipitation at this Nb level for deformation between 1248 and 1348 K (975 and 1075 °C). Using the Dutta–Sellars equations with the mode grain size overestimated the degree of recrystallization for deformation at temperatures above 1283 K (1010 °C), while modeling the behavior for individual grain size classes gave better agreement for the degree of recrystallization and also predicted the resulting grain size distributions. Within the conditions studied (reaustenitization at 1498 K (1225 °C) and single hit thermomechanical simulation with 0.3 strain, 10-second hold), there was no effect of strain-induced precipitation on the extent of recrystallization detected.
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Acknowledgments
The authors thank Corus UK Ltd. for provision of test material. Thanks are due to Professor P. Bowen for the provision of research facilities at the University of Birmingham and Dr. Z. Husain and Mr. G. Claxton, Swinden Technology Centre, for their kind support during some of the Gleeble experiments. One of the authors (AK) is grateful to “The Universities, UK” for awarding the scholarship to carry out her research in the United Kingdom.
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Manuscript submitted July 19, 2009.
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Kundu, A., Davis, C. & Strangwood, M. Modeling of Grain Size Distributions during Single Hit Deformation of a Nb-Containing Steel. Metall Mater Trans A 41, 994–1002 (2010). https://doi.org/10.1007/s11661-009-0167-9
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DOI: https://doi.org/10.1007/s11661-009-0167-9