Author :
Najafi- Zadeh, A.,Jonas, J. J
Abstract :
Flow curves are generated in multi-pass torsion tests for titanium stabilized and niobium stabihzed IF steel. Two type of test schedule are used, one based on plated rolling and other approximating strip rolling. The purpose of the former is to define the three critical temperatures of steel rooling.The strip schedules are varied in order to investigate the influence of increasing the total finishing strain (from 2.1 to 3.2) and lowering the first finishing pass temperature (from 900 to 930C) on microstructural evolution in these steels.All the tests are carried out at a strain rate of .Under hot strip rooling condintions.Static recrystallization is responsinble for the high degree of interpass softening.During the final passes, dynamic recrystallization occurs to a degree that depends on the composition of the steel.the total finshing strain and the temperature.Subbjected to the same strip rooling schedule, the niobioum stabilized steel has a finer ferrite grain size that IF steel stabilized with titanium.
