激光增材制造WNbMoTa高性能高熵合金

With the universal improvement of the manufacturing requirements of temperature-resistant high-end equipment in industry,the existing alloy systems and traditional manufacturing processes have difficulties in meeting the current requirements. High-entropy alloys and laser additive manufacturing technology are coupled to provide a new solution for the overall manufacturing of large-size and complex high-end equipment parts in China. On the one hand, a variety of high-entropy alloys such as WNbMoTa and NbMoTa are formed by the laser cladding deposition. The grain size of the formed alloys is small and the constitutional segregation is not obvious. Among them, the yield strength of NbMoTa alloy under 1 000 ℃ reaches to 530 MPa, higher than GH4169, DZ125 high-temperature alloys used in domestic aero-engine turbine blades and T111, C103, Nb-1Zr refractory alloys used in domestic aerospace industry. On the other hand, the thermal stress and strain during high-entropy alloys forming are simulated based on FD-FE simulation, solving the problem that the samples are easy to warp in the process of selective laser melting.