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通过对掺杂钨精矿粉末的Fe40Al60粉末压坯进行激光点燃自蔓延烧结,制备原位自生颗粒增强复合材料。利用表征手段分析钨精矿粉末添加量对烧结合金显微组织结构及宏观性能的影响规律。结果表明,随钨精矿粉含量的增加,合金显微组织由片状变为颗粒状,烧结合金物相主要为Al2O3、FeAl、Fe3Al、Fe7W6、W及硬质颗粒相WO3。当钨精矿粉末含量为1%时,烧结合金密度最大,为4.27 g/cm3;孔隙率最小,为12.2%;硬度最高,上表层区达到1050 HV,中部区达到1818 HV,底层区达到1232 HV;合金磨损率最低,表层区为0.99 mg/mm2,中部区为0.59 mg/mm2,底层区为0.75 mg/mm2;合金耐蚀性能最好,腐蚀电流密度为116μA/cm2。
In-situ self-reinforced particle reinforced composites were prepared by self-ignition laser sintering of Fe40Al60 powder compact with tungsten powder. The influence of tungsten powder addition on the microstructure and macroscopic properties of the sintered alloy was analyzed by characterization. The results show that with the increase of the content of tungsten concentrate, the microstructure of the alloy changes from flake to granular. The main phase of sintered alloy is Al2O3, FeAl, Fe3Al, Fe7W6, W and hard particle phase WO3. When the content of tungsten concentrate powder is 1%, the sintered alloy has the highest density of 4.27 g / cm3, the lowest porosity of 12.2%, the highest hardness of 1050 HV in the upper surface area, 1818 HV in the middle area and 1232 in the bottom area HV. The wear rate of the alloy was the lowest. The surface area was 0.99 mg / mm2, the middle area was 0.59 mg / mm2 and the bottom layer was 0.75 mg / mm2. The corrosion resistance of the alloy was the best, and the corrosion current density was 116μA / cm2.