Fe-Mn-Si-Al系TWIP钢显微组织与力学性能的研究

MICROSCOPIC STRUCTURE AND MECHANICAL PROPERTY OF Fe-Mn-Si-Al TWIP STEELS

在室温下对Fe-（15～25）Mn．3Si-3A1钢进行静态拉伸，通过X射线衍射、TEM、SEM观察对塑性变形中孪晶以及εhcp，αbbc马氏体的形成进行了研究。结果表明，随着Mn含量的增加，孪晶形成逐渐起主导作用；TWIP钢表现出高的抗拉强度（650～1100MPa），高的应变硬化率和极高的伸长率（20％～90％），可满足汽车轻量化的需求。

General mechanical properties of Fe-（ 15 - 25）wt, % Mn steels with additions of 3 % A1 and 3 % Si were investigated by tensile tests at room temperature, The formation of twins, εhcp and αbbc-martenite during plastic deformation was analyzed by X-ray diffraction, scanning electron microscopy （SEM） and transmission electron microscopy （TEM）. Results showed that with the increasing of Mn content the formation of twin would gradually play a leading role. TWIP steels all exhibited high tensile strength （650 ～ 1100 MPa） and extremely large elongation （19% ～ 89.5%）. It will meet the requirements for light weight modem vehicle.