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

KeyWords: Nanostructured surfaces; Laser machining; Shear force microscopy; Directed energy surface treatments
DOI: 10.1007/s12541-019-00174-1

Citations: 3
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