چكيده لاتين :
The presence ofbainite in the microstructure ofsteels to obtain a proper combination of
strength and toughness has always been desired. The previous works however have shown that
the presence ofpreferred bainite morphologies in the microstructure of any steel would not be
readily accessible. In addition, the appearance of different bainite morphologies in the
microstructure ofany steel is dictated by different factors including the steel initial microstructure,
austenitization characteristics, thermomechanical processing parameters and so on. Accordingly,
in the present work, the effect of prior austenite grain size and the amount of austenite hot
deformation on the bainite formation characteristics were investigated in 0.12C-2.5Ni-I.2Cr
steels. The results indicated that the prior austenite grain size and the amount ofdeformation in
the austenite no-recrystallization region resulted in significant changes of the bainite formation
kinetics and morphology.
