【摘要】 在节能环保大背景下，汽车工业领域用钢不断得到升级优化，作为新一代先进钢铁材料，Fe-Mn-Al-C系低密度钢以其低密度和高强韧性得到了越来越多的关注。Fe-Mn-Al-C系低密度钢中基本合金元素为Fe、Mn、Al、C，基本组成相为奥氏体（γ）、铁素体（α），在一定工艺条件下，还含有κ-碳化物、B2、DO₃和β-Mn等析出相，根据其组成相，可分为铁素体低密度钢、奥氏体低密度钢、铁素体基低密度钢和奥氏体基低密度钢。热处理工艺对调控低密度钢组织构成和析出相的析出行为有着重要作用，进而提高低密度钢的综合力学性能。研究表明，退火处理可以有效地消除冷轧低密度钢的带状组织，改善其强韧性；而控制固溶和时效处理工艺，可以调控析出相的大小、形态、分布等获得高强塑积低密度钢，因此热处理是优化低密度钢综合性能的一个行之有效的方法。本文对Fe-Mn-Al-C系低密度钢的成分设计和组成相特点作了介绍，从热处理工艺角度出发，对该体系钢的微观结构和力学性能影响进行了综述，着重从退火、固溶处理和时效处理等热处理方式进行了阐释，基于Fe-Mn-Al-C系低密度钢研究现状，对该体系钢未来的研究方向进行了展望，为后续研究提供一定的参考价值。更多还原

【Abstract】 Under the background of energy saving and environmental protection,steel used in the automotive industry has been continuously upgradedand optimized.As a new generation of advanced steel materials,Fe-Mn-Al-C series low-density steel has attracted more and more attention due to its low density and high strength and toughness.The basic alloying elements in Fe-Mn-Al-C series low-density steel are Fe,Mn,Al,and C,and the basic phase constituents are austenite （γ） and ferrite （α）.It also containsκ-carbide,B2,DO₃and β-Mn and other precipitation phases under different processing and heat treatment conditions.According to phase constituents,it can be divided into ferritic low-density steel,austenitic low-density steel,ferritic based low-density steel and austenitic based low-density steel.The heat treatment process plays an important role in regulating the microstructure and precipitation behavior of low-density steel,which can improve the comprehensive mechanical properties of low-density steel.Studies have shown that annealing treatment can effectively eliminate the band-like structure of cold-rolled low-density steel and improve its strength and toughness;while controlling the solid solution and aging treatment processes can control the size,shape,and distribution of the precipitates to obtain high-strength plastic products with low density steel,so heat treatment is an effective way to optimize the overall properties of low-density steel.In this paper,the composition design and phase characteristics of Fe-Mn-Al-C series low-density steel are introduced.The influence of heat treatment process on microstructure and mechanical properties of the steel was reviewed,the heat treatment methods such as annealing treatment,solution treatment and aging treatment are explained.Based on the research status of Fe-Mn-Al-C series low-density steel,the future research direction of this steel is prospected,which can serve as reference for further research.更多还原