Mn含量对轻质Fe-10Al-0.8C-10/15Mn钢组织与力学性能的影响

摘要

The lightweight Fe-10Al-0.8C-10/15Mn steel with different Mn contents was designed,and the effects of different annealing temperatures on the microstructure and mechanical properties were studied by optical microscope,XRD,SEM and so on.The results showed that the increase of Mn content significantly improved the plasticity and mechanical properties of the lightweight steel.Mter being annealed at temperatures ranging from 950 ℃ to 1050 ℃,the tensile strength of test steel was higher than 980 MPa,the elongation was more than 40％.On the one hand,the high content of Mn inhibited the formation of κ-carbide;on the other hand,the ferrite was distributed in broken form,which was the main reason for improvement of the plasticity of the test steel.In addition,the increase of Mn content,having changed the deformation mechanism of austenite,was probably another key factor that induced the plasticity improvement of test steel.%设计了不同Mn含量的轻质Fe-10Al-0.8C-10/15Mn系钢,通过金相显微镜、XRD及SEM等技术研究了不同退火温度对其组织和力学性能的影响.结果表明,Mn含量的提高明显改善了轻质钢的塑性和综合力学性能.试验钢经950～1 050℃淬火后,抗拉强度大于980MPa,断后伸长率大于40％.高的Mn含量一方面抑制了κ-碳化物的生成,另一方面使得δ-铁素体呈破碎形态分布,这是改善试验钢塑性的主要原因.此外,Mn含量的提高,改变了奥氏体的变形机制,这可能是试验钢塑性提升的另一个重要原因.