Diffusion bonding of laser surface melted nickel alloy material

Diffusion bonding studies were performed on Laser Surface Melted (LSM) Ni-Cr-Fe material. LSM generates metastable microstructures with extended solid solution. The rapid quenching associated with LSM generates a zone that is void of intragranular precipitates, consists of well-defined grain boundaries via intergranular carbides, and contains fine-grained material. Grain growth across the bondline and precipitate morphology were studied as a function of laser beam power (energy density) and bonding temperature. LSM at low energy density produced excellent grain growth across the bondline even when bonding at low temperature,.