| Abstract Scope |
This study investigates the capabilities of directed energy deposition (DED) for fabricating high-temperature MCrAlY protective coatings. Initially, a bulk IN718 block was additively manufactured and subsequently sectioned to serve as the experimental substrate. A systematic parametric optimization was conducted by varying laser power and scanning speed to find the ideal processing window. Under these optimized conditions, MCrAlY multiple-tracks and multiple-layer coatings were deposited. The investigation focused on microstructural characterization and coating properties, analyzing phase distribution and interface quality. Furthermore, a detailed microhardness profile was measured across the coating-substrate boundary to evaluate the mechanical gradient. The results reveal a defect-free, metallurgically bonded coating with superior properties. This study demonstrates the significant practical value of DED technology as an efficient method for fabricating high-performance industrial protective coatings. |