DED process parameters optimization via experiments

• Main Author: Lee, Anthony Kai Zhe
• Other Authors: Li Hua
• Format: Final Year Project
• Language: English
• Published: Nanyang Technological University 2023
• Subjects: Engineering::Mechanical engineering
• Online Access: https://hdl.handle.net/10356/167312
• Institution: Nanyang Technological University

The additive manufacturing (AM) technique Directed Energy Deposition (DED) specializes in mending, quick prototyping, and low-volume part manufacturing. Due to its tremendous advantages, it is commonly employed in various sectors, such as aerospace, healthcare, and the military. A common material to work with is 316L stainless steel because of its excellent tensile and corrosion-resistant qualities. For this project, 5 process parameters (Laser Power, Scanning Speed, Powder Mass flow rate, XY-Incremental ratio, and Z Incremental ratio) were varied with different values to get a correlation with the microstructure parameters (Grain Area, Grain Ellipse aspect ratio, and Grain angle) and the mechanical property (Ultimate Tensile Strength) of a multi-layer multi-track deposition. The microstructure was analysed using Electron Backscatter Diffraction (EBSD) method and a relationship between the process parameters, microstructure parameters, and the ultimate tensile strength was concluded.