Surface Morphologies in Ultra-short Pulsed Laser Processing of Stainless-Steel at High Repetition Rate

Year: 2019

Authors: Lazzini G., Gemini L., Lutey AHA., Kling R., Romoli L., Allegrini M ., Fuso F.

Autors Affiliation: Univ Parma, Dept Engn & Architecture, I-43124 Parma, Italy; Inst Opt Aquitaine, ALPhANOV, F-33400 Talence, France; Univ Pisa, Dipartimento Fis Enrico Fermi, I-56127 Pisa, Italy; CNR, INO, I-56124 Pisa, Italy.

Abstract: Stainless-steel is ablated with femtosecond laser pulses at high repetition rate. A multi-pass, high spatial overlap laser scanning strategy is applied in order to cope with the requirements for large-scale machining of high aspect ratio structures. Topography of the processed surfaces is analyzed via Shear Force Microscopy scans, with the main aim to investigate morphology changes as a function of process parameters. Quantitative assessment of local height variations enables a detailed investigation of the produced features. Depending on the process parameters, in particular on laser fluence and repetition rate, a transition from small islands to large bumps is observed, explained in terms of feature coalescence.

Journal/Review: INTERNATIONAL JOURNAL OF PRECISION ENGINEERING AND MANUFACTURING

Volume: 20 (9)      Pages from: 1465  to: 1474

More Information: This work has received funding from the EU Horizon 2020 Research and Innovation Programme under Grant Agreement No. 687613 TresClean. GL, MA and FF gratefully acknowledge technical assistance with the ShFM setup from Nicola Puccini and Enrico Andreoni.
KeyWords: Nanostructured surfaces; Laser machining; Shear force microscopy; Directed energy surface treatments
DOI: 10.1007/s12541-019-00174-1

Citations: 5
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