Directed Energy Deposition of UNS C63020 Nickel Aluminum Bronze Powder
摘要
Nickel Aluminum Bronze (NAB) alloys are strong, corrosion-resistant materials widely used in marine environments. NAB alloys processed via laser additive manufacturing (AM) techniques are starting to emerge in the literature and exhibit promising strength and corrosion properties. The high cooling rates found in AM can lead to microstructural refinement and better control of phase precipitation through subsequent heat treatments, leading to improvements in material performance. The ability to produce large, net-shape parts in an on-demand production scenario also makes directed energy deposition (DED) of these materials attractive in sectors such as marine defense, where NAB is used extensively. In the present work, DED of a UNS C63020 NAB powder was explored. Suitable deposition parameters that produced dense NAB specimen were identified and employed to fabricate solid test specimen. Post-heat treatment microstructures of laser clad specimen were evaluated using laser confocal microscopy and SEM-EDS, while X-ray diffraction was used to identify the constituent phases. The mechanical properties of the laser clad specimen were determined and compared to a laser powder bed fusion (LPBF)-processed NAB counterpart.