Mechanism of Microstructural Banding in Hot Rolled Microalloyed Steels
Pilot-scale plate rolling experiments and laboratory thermomechanical processing experiments were carried out to understand the mechanism of microstructural banding in low-carbon microalloyed steels. The microstructural banding originates with large elongated austenite grains, which are present at the roughing stage of rolling. The large austenite grains develop when conditions favour abnormal grain growth during reheat and/or strain induced grain boundary migration (SIBM) in the first few rolling passes. Microstructural banding is eliminated by designing TMP schedules to avoid abnormal grain growth and SIBM.
J.M. Rodriguez-Ibabe, I. Gutiérrez, B. López and A. Iza-Mendia
S. Cai and J.D. Boyd, "Mechanism of Microstructural Banding in Hot Rolled Microalloyed Steels", Materials Science Forum, Vols. 500-501, pp. 171-178, 2005