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对Fe-24Al合金进行C和Mn的双元素合金化,利用金相、SEM、XRD和激光共聚焦显微镜研究合金铸态的组织及其形成机理.结果表明,铸态组织由α-Fe、FeAl、Fe3Al及Fe3AlC相组成.组织中存在富Al相和富C相.随着C和Mn元素的加入,合金的硬度(HV)从280增加到330,抗拉强度从400 MPa增加到741MPa,断裂方式从完全的脆性转变为略有塑性.当加热温度为625℃时,两种白色富集相变得较为清晰,同时细小富集相的数量增加.随着温度进一步升高,合金中条状和块状白色富集相的数量显著减少,有序相固溶到基体中,当温度高于1 100℃时,合金局部组织出现轻微的氧化现象.“,”In order to improve the brittleness of Fe-24Al alloy,the alloying of C and Mn elements duplex was adopted,and the microstructure,phase structure and formation mechanism of the alloying Fe-24Al alloy were investigated by the metallographic,SEM,XRD and confocal laser scanning microscopy.The results show that the phase structure is composed of α-Fe、FeAl、Fe3Al and Fe3AlC phase,in which Alenrichment and C-enrichment phase can be observed.The hardness and strength of the alloys are increased from 280 HV,400 MPa to 330 HV,741 MPa,respectively,and the fracture modes are changed from brittle fracture to a fewer ductility fracture.The confocal laser scanning microscopy indicates that two kinds of white-enriched phases become cleaner,and the number of fine-enriched phases is increased.With the further increase of the temperature,the number of the white bulk and strip rich phases is decreased,and the ordered phases is dissolved into the matrix.When the temperature is the higher than 1 100 ℃,the local oxidation phenomenon is presented in microstructure of the alloy.