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微米TiC颗粒对选区激光熔化Inconel 625合金微观组织及力学性能的影响

Effects of micro-TiC particles on microstructure and mechanical properties of selective laser melting Inconel 625 alloys

    摘要
  • 摘要: 采用选区激光熔化成形技术制备了Inconel 625−xTiC（x=0、2%、4%、6%，质量分数）合金材料，探究微米TiC颗粒对Inconel 625微观组织及力学性能的影响。结果表明，Inconel 625−xTiC合金材料主要由γ-Ni、TiC和Laves（Cr2Nb）相构成。随着TiC质量分数的增加，合金微观组织由熔道中部柱状树枝晶为主+熔道交界处等轴晶为辅的形貌逐渐转变为由胞状等轴晶等亚结构组成的形貌。当TiC质量分数为6%时，合金硬度和抗拉强度最高，分别为Hv0.2 (525.3±15.13)和(1440.31±22.33) MPa，但是总断后延伸率却从(30.0±0.56)%下降到了(3.2±0.98)%。

     

    Abstract: The Inconel 625–xTiC (x=0, 2%, 4%, 6%, mass fraction) alloys were prepared by selective laser melting forming technology. The effects of micro-TiC particles on the microstructure and mechanical properties of Inconel 625–xTiC alloys were investigated. The results show that the Inconel 625–xTiC alloys are mainly composed of γ-Ni, TiC, and Laves (Cr2Nb) phases. With the increase of TiC mass fraction, the microstructure of Inconel 625–xTiC alloys gradually changes from the columnar dendrites in the middle of the melt tracks and the equiaxed crystals at the junction of the melt tracks to the cellular equiaxed crystals and other substructures. When the TiC mass fraction is 6%, the hardness and tensile strength of Inconel 625–xTiC alloys are the highest, which are HV0.2 (525.3±15.13) and (1440.31±22.33) MPa, respectively; however, the total elongation decreases from (30.0±0.56)% to (3.2±0.98)%.

     

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