Abstract
Recrystallization behavior of a Nb-Mo microalloyed steel has been investigated using double-hit compression tests. A suitable reheating temperature and soaking time were established for the complete dissolution of the microalloying precipitates prior to hot deformation. The influence of hot deformation conditions on the flow behavior and the effect of alloying elements, Nb in particular, on austenite recrystallization kinetics are highlighted. The strain-induced precipitation has been found to play an important role in hindering recrystallization kinetics. Post-deformation microstructural analysis indicates that strain-induced grain boundary migration (SIMB) is one of the mechanisms for the formation of recrystallized grains. Retardation of recrystallization has been explained by estimating pinning force of Nb(C, N) precipitates and recrystallization driving force at 1000 °C, which is in good agreement with the experimental observations in the present study as well as other reported data. The study brings out a better understanding on the influence of strain-induced precipitates on recrystallization behavior.
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Mandal, G.K., Das, S.S., Kumar, T. et al. Role of Precipitates in Recrystallization Mechanisms of Nb-Mo Microalloyed Steel. J. of Materi Eng and Perform 27, 6748–6757 (2018). https://doi.org/10.1007/s11665-018-3711-1
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DOI: https://doi.org/10.1007/s11665-018-3711-1