Grain Size Distributions after Single Hit Deformation of a Segregated, Commercial Nb-Containing Steel: Prediction and Experiment |
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Authors: | Amrita Kundu Claire Davis and Martin Strangwood |
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Affiliation: | (1) School of Metallurgy and Materials, The University of Birmingham, Edgbaston, Birmingham, B15 2TT, United Kingdom |
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Abstract: | The present investigation examines the applicability of the Dutta–Sellars equations in predicting the recrystallized grain
sizes following deformation for a 0.046 wt pct Nb-bearing, commercially produced steel with a segregated solute content (from
continuous casting). The investigation considered initial unimodal and bimodal grain size distributions before deformation
that were generated by reheating the steel to 1498 K and 1423 K (1225 °C and 1150 °C), respectively. It was found that the
reheated grain size distribution (separated into grain size classes) could be related to the solute-rich (smaller grain size
classes) and solute-depleted (larger grain size classes) regions. The use of these relationships and a simple halving of the
grain size within the distribution on recrystallization (used previously for homogenized samples of this steel) were found
to be appropriate in the grain size class-based use of the Dutta–Sellars equations with respect to mode and maximum grain
sizes after hot deformation and holding. This approach successfully predicted (confirmed by experiment) the grain size distribution
after deformation in the presence of Nb segregation from continuous casting. |
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