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以Fe_(50-x/2)Al_(50-x/2)Cr_x(x=4,8,12,16)体系粉末为基体,掺杂1%(质量分数)的钨精矿粉末,压制成坯。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。采用OLYMPUS4000、XRD等微观组织结构表征手段及合金硬度、磨损性能等宏观力学性能及腐蚀性能测试方法,研究不同Cr粉含量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Fe_3Al,Al_2O_3,AlCrFe_2,Cr_2O_3及硬质颗粒相W。当Cr含量为8%时,烧结合金内部针状组织细小致密,物相有较好的分散性;磨损率相对较低,为0.38 mg/mm~2。当Cr含量为12%时,烧结合金硬度最高,为11 450 MPa;自腐蚀电位最大,为327.643 mV;腐蚀电流密度最小,为1.044 m A·cm~(-2),腐蚀速率最低。
The tungsten powder with 1% (mass fraction) was doped with Fe_ (50-x / 2) Al_ (50-x / 2) Cr_x (x = 4,8,12,16) Billet. Preparation of in - situ particle reinforced composites by laser ignition self - propagating sintering. The microstructural characterization methods such as OLYMPUS4000, XRD and macroscopic mechanical properties such as hardness and wear properties and the corrosion testing methods were used to study the effect of Cr content on the microstructure and properties of sintered alloys. The results show that the main phase of sintered alloy is Fe 3 Al, Al 2 O 3, AlCrFe 2, Cr 2 O 3 and hard particle phase W. When the Cr content is 8%, the microstructure of the sintered alloy is fine and compact, and the phase of the sintered alloy is well dispersed. The wear rate is relatively low, 0.38 mg / mm ~ 2. When the content of Cr is 12%, the hardness of the sintered alloy is the highest (11 450 MPa), the corrosion potential is the highest (327.643 mV), the corrosion current density is the smallest (1.044 m A · cm -2) and the corrosion rate is the lowest.