| Abstract Scope |
Contrast to traditional bulk metal manufacturing process, Laser Powder Bed Fusion AM is different in many ways, although, principally, it follows welding processes, which means epitaxial grain growth bypassing nucleation followed by competitive grain growth and elimination, but the boundary conditions of LPBF-AM are hugely different from a typical welding which created this micro scale grain optimization. As result, LPBF-AM can produce very unique and superior materials properties by introducing strengthening mechanisms without altering the alloy compositions that do not exist in the bulk metal manufacturing process. Alloys in two different categories: nickel base superalloy and niobium base refractory alloy, are being investigated in this work. Each exhibited significant superior properties that their wrought equivalents couldn’t come close. For H230, a high Tungsten (14%) solid solutions strengthened alloy, in LPBF-AM was enhanced by Carbide Dispersion Strengthening (CDS) where stable, nano particles of WC were dispersively produced. |