Al对锻态中锰钢组织与性能的影响

摘要：对比研究了锻态0.15C5Mn钢和0.15C5Mn2Al钢在室温下和750℃准静态拉伸条件下的力学性能，并对微观组织利用SEM和EBSD进行表征。研究结果表明，Al的加入引起了室温下的微观组织结构的不同，含铝钢在室温下的组织中存在很少量铁素体，导致含铝钢强度低；锻态0.15C5Mn钢和0.15C5Mn2Al钢在750℃下分别获得了90.5%和101%的伸长率；经750℃拉伸变形后0.15C5Mn钢获得马氏体组织，Al元素的添加扩大了双相区，使0.15C5Mn2Al钢在双相区拉伸变形，最终得到铁素体+马氏体双相组织，双相区变形使0.15C5Mn2Al钢具有较高的伸长率，降低了抗拉强度。

Effect of Al on microstructure and properties of forged medium manganese steel

The mechanical properties of forged 0.15C5Mn steel and 0.15C5Mn2Al steel at room temperature and 750℃ under quasi static tensile conditions were compared. The microstructures were characterized by scanning electron microscopy and electron backscattered diffraction. The results show that the addition of Al causes a difference in the microstructure at room temperature. There is a small amount of ferrite in the structure of aluminum containing steel at room temperature,which results in low strength of aluminum containing steel. An elongation of 90.5% and 101% was obtained in forged 0.15C5Mn steel and 0.15C5Mn2Al steel at 750℃,respectively. After 750℃ tensile deformation,the 0.15C5Mn steel obtained a martensitic structure. The addition of the Al element expanded the dual phase region and made the 0.15C5Mn2Al steel have tensile deformation in the dual phase zone,which results in the dual phase structure of ferrite + martensite. The deformation in the dual phase zone makes the 0.15C5Mn2Al steel have a higher elongation and lower tensile strength.