(辽宁工程技术大学 材料科学与工程学院，阜新 123000)
摘 要: 往(Fe-Cr)(40)-Al(60)粉末中加入1%(质量分数)的钨精矿粉，利用激光引燃自蔓延烧结制备原位自生颗粒增强复合材料。通过SEM、XRD等微观组织结构表征手段及合金密度、孔隙率、硬度、磨损性能等宏观力学性能及腐蚀性能测试的方法，研究不同引燃功率对烧结合金组织及性能的影响。结果表明：烧结合金物相主要为AlFe、AlFe3、Al2O3、Al65Fe20W15、W及硬质颗粒相WO3。烧结合金组织为针片状，且随功率的增加，组织变得均匀细密。当功率达到1 100 W时，烧结合金密度最大，为4.47 g/cm3，孔隙率最小，为4.43%；硬度最高，表层区达到1 309.7HK，中部区达到1 003.1HK；合金耐蚀性能最好，钝化区最长为440 mV，钝化电流密度最小为5.570 μA/mm2。而当烧结功率为1 000 W时，试样磨损率最低，表层区为0.06 mg/mm2，中部区为0.05 mg/mm2。
关键字: Fe-Al金属间化合物；激光烧结；显微组织；性能
（College of Materials Science and Engineering, Liaoning Technical University, Fuxin 123000, China）
Abstract:By putting 1% (mass fraction) tungsten concentrate powders into(Fe-Cr)(40)-Al(60) powders and using laser ignition induced SHS, the in situ antigenic particle reinforced composite alloy was prepared. By means of SEM, XRD, alloy density, porosity, hardness test, abrasion test and corrosion resistance, the effect of different ignition powers on the sintered alloy microstructure and properties was studied. The results show that the product phases of the sintered alloys are AlFe, AlFe3, Al2O3, Al65Fe20W15, W and WO3. The sintered alloy exhibits batten organization, and with the increase of the laser sintering power, the battens get more homogeneous and even small. When the laser sintering power is up to 1 100 W, the sintered alloy achieves the maximum density of 4.47 g/cm3 and the minimum porosity of 4.43%; the highest hardness of the surface layer is 1 309.7HK, that of the middle layer is 1 003.1HK; the corrosion resistance is the best, the longest passivation area is 440 mV and the passivation current density is only 5.570 μA/mm2. When the laser sintering power gets to 1 000 W, the relative wear rate of the sintering alloy is the lowest, the abrasion rate of the surface layer is 0.06 mg/mm2 and that of the middle layer is 0.05 mg/mm2.
Key words: Fe-Al intermetallic compound; laser sintering; microstructure; property
