Solid-State Joining of Dissimilar Ni-Based Superalloys via Field-Assisted Sintering Technology for Turbine Applications

The article delves into the use of Field-Assisted Sintering Technology (FAST) for joining dissimilar Ni-based superalloys, specifically CM247LC and Inconel 718, which are crucial for turbine blade-disk assemblies. It compares FAST with conventional methods like linear friction welding and diffusion bonding, emphasizing the advantages of FAST in avoiding heat-affected zones and residual stresses. The study highlights the formation of a diffusion bonding zone with a gradient of elemental composition and precipitation, resulting in high bonding strengths comparable to the parent materials. The research also explores the potential of FAST to complement or replace conventional post-processing heat treatments, making it a viable alternative for solid-state joining in high-performance applications.