Experimental study on the grain evolution induced by thermal characteristics during oscillation laser welding of IN718

A review: Suppression of the solidification cracks in the laser welding process by controlling the grain structure and chemical compositions

“…As a result of the refinement by oscillation with 50 and 150 Hz, larger grain boundaries are created. They can undergo plastic deformation, which is induced by the low melting of the liquid film of eutectic constituents and improves the distribution of the voids (Yan et al, 2022).…”