Selective laser melting (SLM) at different laser fluences was used to fabricate a TiC/Inconel 625 (TiC/IN625) nanocomposites. The influence of laser fluence on surface morphology, microstructure evolution, and mechanical properties of the TiC/IN625 nanocomposites were studied. The surface morphology of the TiC/IN625 nanocomposites was affected by the applied laser fluence, and the surface morphology was optimal when the laser fluence was 208 J/mm³. The laser fluence influenced growth of the TiC/IN625 nanocomposites microstructure, ranging from insufficient growth (139 J/mm³) to sufficient growth (167 J/mm³) and refined columnar/cellular dendrites (208 J/mm³). A continuous and refined ring-like network structure with homogenously distributed reinforced TiC phases was obtained. Obvious grain refinement occurred in the TiC/IN625 nanocomposites because TiC nanoparticles acted as nuclei for heterogeneous nucleation. The TiC/IN625 nanocomposites printed at 208 J/mm³ exhibited 1219 MPa ultimate tensile strength and 31% fracture strain. The superior strength of the TiC/IN625 nanocomposites was attributed to dislocation strengthening, Orowan strengthening, grain refinement strengthening, and load-bearing strengthening.

使用不同激光注量下的选择性激光熔融（SLM）来制备TiC / Inconel 625（TiC / IN625）纳米复合材料。研究了激光注量对TiC / IN625纳米复合材料的表面形态，微观结构演变和力学性能的影响。TiC / IN625纳米复合材料的表面形貌受激光通量的影响，当激光通量为208 J / mm ³时，表面形貌最佳。激光能量密度影响TiC / IN625纳米复合材料微结构的生长，从生长不足（139 J / mm ³）到足够的生长（167 J / mm ³）和细化的柱状/细胞树突（208 J / mm ^3）。）。获得具有均匀分布的增强TiC相的连续且细化的环状网络结构。TiC / IN625纳米复合材料中发生了明显的晶粒细化，因为TiC纳米粒子充当了异质成核的核。以208 J / mm ³印刷的TiC / IN625纳米复合材料表现出1219 MPa的极限拉伸强度和31％的断裂应变。TiC / IN625纳米复合材料的优异强度归因于位错强化，Orowan强化，晶粒细化强化和承重强化。