The influence of Mn segregation banding on the microstructure homogeneity and mechanical property of medium manganese system steels with both equiaxed and lath-like microstructures has been investigated by adding the pre-quenching treatment before the intercritical austenitization and subsequent quenching & partitioning process (IQP). Both the crack observation and KAM characterization in these two types of microstructure intuitively indicate different micro-cracking resistance and in-grain strain accommodation of intercritical ferrite during the deformation. The excessive inhomogeneous microstructure and blocky retained austenite with low stability accelerate the failure of the material with Mn segregation banding. The fine lath-like ferrites with great contact ratio to the surrounding martensites improve the microstructural homogeneity under pre-quenching process. The alternative arrangement of lath-like soft ferrite and hard martensite results in optimal mechanical properties of material with Mn segregation banding.

通过在临界奥氏体化及随后的淬火和分配过程（IQP）之前添加预淬火处理，研究了Mn偏析带对具有等轴和板条状组织的中锰系统钢的组织均匀性和力学性能的影响。这两种类型的显微组织中的裂纹观察和KAM表征都直观地表明，在变形过程中，临界铁素体具有不同的抗微裂纹性和晶粒内应变适应性。过度的不均匀组织和低稳定性的块状残余奥氏体会加速具有Mn偏析带的材料的破坏。与周围马氏体的接触率高的细板条状铁素体提高了淬火前的组织均匀性。板条状软铁素体和硬马氏体的交替排列导致具有Mn偏析带的材料具有最佳的机械性能。