Submicron TiC particles reinforced Inconel 625 (TiC/IN625) metal matrix composites were additively fabricated by laser direct energy deposition. The effect of nanoprecipitations on microstructure evolution, mechanical properties and corrosion resistance of the TiC/IN625 composites were studied. The results showed that the TiC particles completely decomposed into Ti and C atoms, and reprecipitated in the form of MC ( M = Ti, Mo, Nb) carbides and Al 2O 3- MC core-shell nanogranules, contributing to the grain refinement and dramatic dislocation multiplication and pile-up. Due to the synergistic strengthening effect of nanoprecipitations including Al 2O 3 oxides, MC carbides, Al 2O 3- MC core-shell nanogranules and Laves phase, along with the solution strengthening effect of the Ti atoms in IN625 matrix and grain refinement, the microhardness was significantly improved from 267 HV to 331 HV with the increasing TiC content from 0.0 to 3.5 wt%, and the ultimate tensile strength increased from 829.1 MPa to 1020.9 MPa with a synchronous deterioration of elongation from 53.6 % to 19.3 %. The corrosion resistance was deteriorated by aggravated pit corrosions around these increased MC carbides and Al 2O 3- MC core-shell nanogranules in comparison to pure IN625 alloy. The wear resistance was significantly improved by the increasing TiC content. The friction coefficient and wear rate achieved the minimum values of 0.59 and 4.23 × 10 −5 mm/(N⋅m), respectively.