Abstract
In the present study, an investigation was carried out to evaluate the effects of different power levels (340W, 360W, 380W, 400W, and 420W) of the pulsed Nd:YAG laser beam welding on the microstructure and nano creep behavior of Inconel 718 alloy. Microstructural results indicated that with the increase in laser power, the grain sizes of the beads decreased due to the high heat input, leading to an increase in solidification rate. Nanohardness and atomic force microscopy (AFM) results revealed that the laser weld bead developed at 420W had the highest hardness, which resulted in the least plastic deformation, owing to the fine grain size and smaller interdendritic spacing. Nanoindentation creep analysis suggested that the highest stress exponent value was measured in the weld bead obtained at 420W, indicating in a dislocation climb creep mechanism.
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