Effect of V/Nb Microalloying on Austenitic Reversion Kinetics in Medium Mn Steels
摘要
Using effective interface mobility, we present a simple approach to analyze the austenitization kinetics in V/Nb microalloyed medium Mn steels. V/Nb addition initially lowers the mobility, consequently refining grain size and decreasing volume fraction of reverted austenite. This effect diminishes at higher temperatures owing to VC/NbC dissolution and coarsening. Satisfactory agreement between experimental and simulated kinetics is achieved only when mobility is modeled as exponentially decaying, a process that V/Nb further slows by impeding dislocation annihilation.