Experimental analysis of applicability of a picosecond laser for micro-polishing of micromilled Inconel 718 superalloy

Abstract

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Laser polishing of 3D printed mesoscale components

“…Corresponding experimental validation trials carried out at pulse durations of 300 and 650 ns, reduced the average workpiece surface roughness Ra to 66 and 47 nm respectively, from an initial value of 95-96 nm. Hafiz et al [27] evaluated the feasibility of using a picosecond laser for micropolishing of Inconel 718 and in particular the effects of laser fluence/energy density. Ablation and melting regimes were prevalent when operating at fluence levels of 0.19-0.24 J/cm 2 and 0.13-0.18 J/cm 2 respectively.…”

Pulsed laser polishing of selective laser melted aluminium alloy parts

“…Much of the later LP research focussed on ferrous materials, predominantly involving tool steels [8,9], although several carbon [10] and stainless steel grades [11] have also been investigated. Similarly, the process has been successfully employed for improving the surface morphologies of components made from nickel [12] and titanium [13] alloys.…”

Femtosecond laser polishing of additively manufactured parts at grazing incidence

“…Besides, it was recently reported that continuous surface melting can even be realized by fs lasers (or ps lasers in more studies) through heat accumulation via MHz-level pulse repetition rates [43][44][45][46]. Such a fs-laser-induced continuous surface melting process could also benefit the achievement of extremely low surface roughness for AM parts.…”