This study utilizes laser directed energy deposition to analyze mechanical behavior and microstructural evolution in K477 and FGH96 alloy joints, suggesting improved high-temperature performance.
Additive manufacturing (AM) enables the fabrication of high-performance alloys with tailored microstructures for demanding environments such as aerospace and gas turbines. In this study, Laser Directed Energy Deposition (LDED) was used to produce a K477/FGH96 alloy joint. Room-temperature tensile tests and Electron Backscatter Diffraction (EBSD) analysis were conducted to evaluate the mechanical behavior and microstructural evolution. The K477 region exhibited fine grains and high strength, while the FGH96 region displayed coarser grains and superior ductility. The interface region acted as the primary site of stress concentration yet remained free of cracking after significant plastic deformation, showing excellent metallurgical bonding and deformation compatibility. These findings provide critical insights into the deformation mechanism of alloy joints and inform strategies for improving the high-temperature performance.
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Si et al. (2025) studied this question.
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