Sajad Gholami Shiri - Ph.D Department of Materials Science & Engineering, School of Engineering, Shiraz University, Zand Ave. Shiraz, Iran
Seyed Ahmad Jenabali Jahromi - Ph.D, Department of Materials Science & Engineering, School of Engineering, Shiraz University, Shiraz, Iran
Yahya Palizdar - Ph.D, Nanotechnology and Advanced Materials Department, Materials and Energy Research Center, Karaj, Iran
Samira Ghadar - M.Sc, Department of Materials Science & Engineering, School of Engineering, Shiraz University, Shiraz, Iran

The compressive deformation behaviors of a new 0.43C–1.50 Mn -3.87 Al-0.03Nb (wt%) based microalloyed TRIP steel were investigated at the temperatures from 850 OC to 1150 OC and strain rates from 0.01 s-1 to 1s-1 on a Gleeble-1500 thermo-simulation machine. The high Al and Si concentration in these steels guarantied the presence of the considerable δ-ferrite phase in the microstructure after the casting and the subsequent hot rolling. The flow stress constitutive equation of hot deformation for this steel was developed with the activation energy Q being about 263 kJ/mol.

TRIP steel, High Al Steel, Hot deformation, Constitutive equation