High-Temperature Deformation Behavior Of A Novel Hot-Rolled Transformation-Induced Plasticity Alloy: Experiments, Constitutive Modeling, And Processing Maps

Hot deformation behavior of a novel hot-rolled transformation-induced plasticity (TRIP) alloy is studied by compression test in the temperature range of 1123-1323 K and strain rate range of 0.1-10 s(-1), and the relation between flow stress and Zener-Hollomon parameter is systematically analyzed. The study indicates that the flow stress of experimental alloy increases with the decrease in deformation temperature and increase in strain rate. The value of stress exponent (n) and activation energy (Q) is 7.4 and 323.5 kJ mol(-1). Processing maps developed using the dynamic material model at strains of 0.25, 0.40, and 0.55 predict optimum hot deformation temperature of 1273 K and strain rate of 0.8 s(-1). The study of dynamic recrystallization (DRX) behavior under different deformation conditions by transmission electron microscope (TEM) suggests that two DRX mechanisms are operative-continuous dynamic recrystallization (CDRX) mechanism, which depends on high density of dislocations at the grain boundaries, and the second mechanism involves strain-induced boundary migration (SIBM), governed by grain boundary bulging.