Laser milling of martensitic stainless steels using spiral trajectories

Year: 2017

Authors: Romoli L., Tantussi F., Fuso F.

Autors Affiliation: Univ Parma, Dept Ind Engn, I-43100 Parma, Italy; Univ Pisa, Dept Phys Enrico Penni, I-56100 Pisa, Italy; Univ Pisa, CNISM, I-56100 Pisa, Italy; INO CNR, Pisa, Italy.

Abstract: A laser beam with sub-picosecond pulse duration was driven in spiral trajectories to perform micro-milling of martensitic stainless steel. The geometry of the machined micro-grooves channels was investigated by a specifically conceived Scanning Probe Microscopy instrument and linked to laser parameters by using an experimental approach combining the beam energy distribution profile and the absorption phenomena in the material. Preliminary analysis shows that, despite the numerous parameters involved in the process, layer removal obtained by spiral trajectories, varying the radial overlap, allows for a controllable depth of cut combined to a flattening effect of surface roughness. Combining the developed machining strategy to a feed motion of the work stage, could represent a method to obtain three-dimensional structures with a resolution of few microns, with an areal roughness S-a below 100 nm.

Journal/Review: OPTICS AND LASERS IN ENGINEERING

Volume: 91      Pages from: 160  to: 168

KeyWords: Laser; Micro machining; Stainless steel; Roughness
DOI: 10.1016/j.optlaseng.2016.11.016

Citations: 21
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