| Abstract Scope |
Due to their superior mechanical strength, corrosion resistance, and performance at elevated temperatures, nickel-based superalloys, such as Alloy 718, are crucial for high-performance applications within aerospace, petrochemical, and power generation industries. Despite their advantages, challenges like weld cracking and complex microstructural control during additive manufacturing (AM) and welding processes significantly impact their performance and manufacturability.
This plenary talk addresses recent advancements in AM and welding methods, particularly arc and laser-directed energy deposition (DED), focusing on manufacturing and repairing superalloy components. Emphasis is placed on the influence of critical processing parameters and heat treatment protocols, including delta processing treatments (DPT), on microstructural evolution and mitigating cracking phenomena. Special attention is given to phase precipitation behavior, notably the delta phase (δ-Ni3Nb), which significantly affects mechanical properties and lifecycle performance.
Additionally, an overview of weldability testing methods will be presented to evaluate and improve the structural integrity and performance reliability of welded and additively manufactured nickel-based superalloys. By highlighting both the scientific challenges and novel solutions in materials joining and AM processes, this contribution provides key insights for enhancing material properties, optimizing manufacturing conditions, and improving overall component life. |