Abstract
对热轧态与固溶处理后Fe-Mn-A1轻质高强钢进行力学性能检测及组织形貌观察，分析950～100℃固溶处理工艺对其组织和力学性能的影响规律．根据真实应力一应变曲线和加工硬化曲线分析拉伸变形特征，对比拉伸变形前后微观组织形貌和XRD谱，研究其微观变形机理．研究结果表明，所设计的成分体系实验用钢，热轧后为奥氏体基体与少量带状铁素体的双相组织，密度为6．55g／cm3，达到了轻质高强的设计目标．固溶处理有利于奥氏体晶粒长大与带状铁素体的破碎分解，使钢板强度降低而塑性提高，但是过高的固溶温度会促进铁素体长大，使铁素体体积分数增大，钢的断后伸长率降低．1050℃固溶处理后Fe-Mn-A1钢抗拉强度为925．9mPa，断后伸长率为50．20％，强塑积为46．48GPa％．连续的应变强化行为使得Fe-Mn-A1钢获得高强度与塑性的良好匹配，稳定硬化阶段应变范围越宽，断后伸长率越大；较高的层错能使其变形机理区别于TRIP和TWlP效应，变形后仍为奥氏体＋铁素体双相组织，变形后奥氏体中可以观察到Taylor晶格、高密度位错墙以及微带结构，为明显的平面滑移特征．
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