The present study was attempted to evaluate the microstructural evolution and mechanical properties of a 3 wt%Al containing medium Mn steel which was warm rolled with different thickness reductions directly after intercritical annealing at 750 °C by using scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction and tensile tests. The results show that the laths of ferrite and retained austenite (RA) not only gradually rotated their longitudinal axis to the rolling direction but also were refined with increasing rolling thickness reduction, and thus a well developed lamellar structure of bimodal size distributed lathy ferrite and RA was obtained after heavy rolling reduction. Though the strength increases while the ductility decreases with increasing rolling thickness reduction, an excellent combination of strength and ductility expressed by the product of ultimate tensile strength (UTS) to total elongation (TEL) of ~ 50 GPa% was obtained through a wide process window of warm rolling. It is thus proposed that warm rolling is a promising way to simplify the traditional multi-stage rolling and annealing processes of Al-containing medium Mn steels, especially to overcome the cold rolling difficulty of medium Mn steels with high carbon content.

本研究试图通过扫描电子显微镜（SEM），透射电子学评估在750°C的临界退火后直接以不同厚度减小的厚度热轧的含3 wt％Al的Mn钢的显微组织演变和力学性能。显微镜（TEM），X射线衍射和拉伸试验。结果表明，铁素体和残余奥氏体（RA）板条不仅使纵轴逐渐向轧制方向旋转，而且随着轧制厚度的减小而细化，从而形成了发达的双峰尺寸片状铁素体和RA的层状结构。重轧压下后获得。尽管随着轧制厚度的减小，强度增加，而延展性降低，通过宽广的热轧工艺窗口，获得了由极限拉伸强度（UTS）到总伸长率（TEL）约50 GPa％的乘积表示的强度和延展性的极佳组合。因此，提出热轧是简化含铝中锰钢的传统多级轧制和退火工艺，特别是克服高碳含量中锰钢冷轧难度的一种有前途的方法。