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In the present work the transformation behaviour of a C-Mn-Nb steel deformed by torsion at temperatures both above and below the non recrystallisation temperature for this steel has been studied in detail. After deformation, specimens were cooled at a constant cooling rate of 1°C/s, and interrupted quenching from different temperatures was used to observe different stages of transformation. In the case of transformation from deformed austenite, in addition to the austenite grain boundaries, the deformation bands and twin boundaries act also as preferential nucleation sites for the ferrite. It has been observed that in all the cases when impingement becomes important, the number of grains per unit volume decreases significantly during transformation denoting that ferrite coarsening is taking place.
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Bengochea et al. (1998) studied this question.