Abstract:Binder jetting is a technology that combines the advantages of both additive manufacturing and powder metallurgy, which can fabricate complex-shaped W-Ni-Fe alloy components with good mechanical properties and dimensional accuracy. Since the optimal process parameters for manufacturing strong and tough W-Ni-Fe alloy via binder jetting are still not publicly reported, this study systematically investigates the influence of the sintering temperature, sintering time, and heat treatment process on the phase composition, microstructure, and mechanical properties of 93W-4.9Ni-2.1Fe alloy produced by binder jetting. The strengthening and toughening mechanisms of different heat treatment processes (vacuum dehydrogenation and cyclic quenching) were analyzed in detail. The results indicate that the impacts of sintering temperature on the physical and mechanical properties of 93W-4.9Ni-2.1Fe alloy are much greater than sintering time, and its numerical design should exceed the powder metallurgy method by at least 20 ℃. In terms of the strengthening and toughening mechanism, vacuum dehydrogenation mainly improves toughness by toughening the Ni-Fe phase, while cyclic quenching mainly improves toughness by reducing the connectivity between W particles and then changing the fracture behavior of W phases. The synergistic use of vacuum dehydrogenation and cyclic quenching resulted in tensile strength and elongation at break of the samples reaching 938 MPa and 18.7%, respectively, which were 13.4% and 253% higher than those of the untreated samples.