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.
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Abbreviations
- X :
-
Longitudinal direction of laser scan
- Y :
-
Lateral direction of laser scan
- RR:
-
Laser repetition rate
- v:
-
Laser scan speed
- F:
-
Laser fluence
- S q :
-
Root-mean-square roughness
- S pd :
-
Surface peak density according to ISO 12178
- A ma :
-
Average motif area according to ISO 12178
- S ks :
-
Motif mean slope according to ISO 12178
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Acknowledgements
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.
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Lazzini, G., Gemini, L., Lutey, A.H.A. et al. Surface Morphologies in Ultra-short Pulsed Laser Processing of Stainless-Steel at High Repetition Rate. Int. J. Precis. Eng. Manuf. 20, 1465–1474 (2019). https://doi.org/10.1007/s12541-019-00174-1
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DOI: https://doi.org/10.1007/s12541-019-00174-1