Influence of thermomechanical processing parameters on critical temperatures to develop an Advanced High-Strength Steel microstructure

Abstract A good selection of the thermomechanical processing parameters will optimize function alloying elements to get most mechanical properties in Advanced High-Strength Steels for automotive components, where high resistance is required passenger safety. As such, critical temperatures must be defined taking into account alloy composition, order effective schedules designed. These mainly include recrystallization stop temperature ( T 5% ) and transformation (A r1 , r3 B s etc.). were characterized using different conditions. was determined through softening evaluation on double hit tests observation prior austenite grain boundaries microstructure. Phase measured by dilatometry experiments at cooling rates. The results indicate that strain per pass interpass time influence determination . range between recrystallized non-recrystallized regions can as narrow 30 °C a higher amount strain. proposed controlled schedule involves getting severely deformed with dislocation density deformation bands increase nucleation sites start products. This microstructure along proper strategy lead an enhancement final particular steel composition.