Numerical model detecting the effect of inter-pass time on grain size for Nb-microalloyed steel
By Maha R. El-Meliegy, Taher Amed El-Bitar, M. S. Hammed, and I. Mousa
Numerical model, grain size, Nb, microalloying , hot rolling, strain rate, inter pass time
An analysis was conducted on pass by pass to evaluate the austenite grain size during hot strip rolling of Nb microalloyed steel. This is achieved by using the available mill log data and the previously developed equations relating the rolling parameters to the grain size. The model calculates the total strain which is composed of the redundant as well as the nominal strain. The recrystallization and precipitation times are also computed for the corresponding conditions of strain, temperature, initial grain size, strain rate and chemical composition. Moreover, the inter-pass time is compared with the recrystallization time to detect the partial recrystallization which has occurred due to either short inter-pass time or start of precipitation.
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