Grain structure development during casting, reheating and deformation of Nb-microalloyed steel

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http://eprints.org/relation/isVersionOf http://etheses.bham.ac.uk/id/document/15990 http://eprints.org/relation/isVolatileVersionOf http://etheses.bham.ac.uk/id/document/15990 http://eprints.org/relation/isIndexCodesVersionOf http://etheses.bham.ac.uk/id/document/15990 archive 4031 disk0/00/00/29/17 2011-11-11 14:13:29 2019-01-23 09:55:06 2011-11-11 14:13:29 thesis show 0 Kundu Amrita Davis Claire University of Birmingham Grain structure development during casting, reheating and deformation of Nb-microalloyed steel unpub TN 10col_ephy This thesis looks at the effect of micro segregation of Nb, generated from the continuous casting on grain structure development during reheating and deformation. The amount of segregated material present in the microstructure has been quantified in the as-cast condition and that has been used to model grain size distribution after reheating and deformation which is required for subsequent toughness prediction in 0.045 wt % Nb steel. The limits of validity of the original Dutta-Sellars model for predicting the amount of recrystallisation; investigating the influence of the variables such as starting grain size distribution, strain and Nb content has been examined. A modified Dutta-Sellars model considering the starting grain size distribution has been found to be more accurate in quantifying the amount of recrystallisation. This approach has been used to model grain size distribution after deformation both in the homogenised and in presence of Nb segregation. The effect of AlN, to replace Nb(C,N), on pinning the austenite grain boundaries during reheating has been investigated, as the segregation tendency of Al is much less compared with Nb. 2011-12 2011-03 graduation eng author unchecked This unpublished thesis/dissertation is copyright of the author and/or third parties. The intellectual property rights of the author or third parties in respect of this work are as defined by The Copyright Designs and Patents Act 1988 or as modified by any successor legislation. Any use made of information contained in this thesis/dissertation must be in accordance with that legislation and must be properly acknowledged. Further distribution or reproduction in any format is prohibited without the permission of the copyright holder. public 354 University of Birmingham School of Metallurgy and Materials d_ph FALSE na 2011-12 graduation