用acta的语气描述下边这段话Two different initial microstructures retaining Mn segregation banding in medium-Mn steel are designed and prepared for the comparative study under IQP process The precise composition i

In this study, two different initial microstructures were designed and prepared for comparative analysis under the IQP process. The steel used has a precise composition of Fe-0.25C-3.08MN-1.5Si-0.054 Nb, wt%. The ingots were laboratory smelted and hot rolled to 4.5 mm with the coiling temperature of 650 °C. Rectangular specimens were machined from the cold-rolled sheets parallel to the rolling direction. Heat treatment experiments were performed on a continuous annealing simulator, and three intercritical annealing temperatures of 720 °C, 740 °C, and 760 °C were designed to obtain different phase proportions. Partition processing was carried out at 400 °C for 60 s, and different quenching temperatures were designed for each sample. The study also included another initial microstructure after cold rolling, which was processed by the same treatment.