A bulk nano-TiC particle reinforced Inconel 625 alloy (TiC/IN625) was manufactured using selective laser melting. The effect of post treatment on the microstructural evolution and mechanical properties of the TiC/IN625 alloy was investigated by using optical microscope, scanning electron microscope, transmission electron microscope, X-ray diffraction, microhardness tests, and uniaxial tension tests. The results demonstrated that heat treatment brought uniformly dispersed γ′ and γ′' phases, coarse MC carbides, and fine secondary carbides to the TiC/IN625 samples. After heat treatment followed by laser shock peening, high-density dislocations and some nanoscale grains were generated in the subsurface of the TiC/IN625 sample. The tensile residual stresses were transformed into compressive residual stresses by laser shock peening. In the laser shock peened TiC/IN625 sample, relatively higher surface microhardness, ultimate tensile strength, and elongation were observed compared to the as-built and heat-treated samples. Furthermore, a synergistic strengthening mechanism, involving precipitation strengthening, grain refinement, and dislocation strengthening, was clearly revealed.

使用选择性激光熔化制造了块状纳米 TiC 颗粒增强的 Inconel 625 合金 (TiC/IN625)。采用光学显微镜、扫描电镜、透射电镜、X射线衍射仪、显微硬度试验和单轴拉伸试验研究了后处理对TiC/IN625合金组织演变和力学性能的影响。结果表明，热处理使γ′和γ′′均匀分散。TiC/IN625 样品的相、粗 MC 碳化物和细二次碳化物。在热处理和激光冲击强化后，TiC/IN625 样品的亚表面产生了高密度位错和一些纳米级晶粒。通过激光冲击强化将拉伸残余应力转化为压缩残余应力。在激光冲击强化的 TiC/IN625 样品中，与完工和热处理样品相比，观察到相对较高的表面显微硬度、极限抗拉强度和伸长率。此外，还清楚地揭示了一种包括沉淀强化、晶粒细化和位错强化的协同强化机制。