Influence of phosphorous and boron on dynamic recrystallization and microstructures of hot-rolled interstitial free steel

It has been found that B strongly retarded dynamic recrystallization of the IF steel in the temperature range of 900-1100 °C. However, P did not delay dynamic recrystallization at 1100 °C. The effect of P on dynamic recrystallization was less than that of B. EBSD analysis revealed that absence of P and B induced fine ferrite grain size and many high angle grain boundaries. The ferrite grain size of P and B free IF steel was 46.4% smaller than that of IF steel having 0.1% of P and 0.001% of B.