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