20.500.12556/RUL-134385 The influence of the processing parameters on the laser-ablation of stainless steel and brass during the engraving by nanosecond fiber laser In this paper, we investigate the influence of the following parameters: pulse duration, pulse repetition rate, line-to-line and pulse-to-pulse overlaps, and scanning strategy on the ablation of AISI 316L steel and CuZn37 brass with a nanosecond, 1064-nm, Yb fiber laser. The results show that the material removal rate (MRR) increases monotonically with pulse duration up to the characteristic repetition rate (f$_0$) where pulse energy and average power are maximal. The maximum MRR is reached at a repetition rate that is equal or slightly higher as f$_0$. The exact value depends on the correlation between the fluence of the laser pulses and the pulse repetition rate, as well as on the material properties of the sample. The results show that shielding of the laser beam by plasma and ejected material plays an important role in reducing the MRR. The surface roughness is mainly influenced by the line-to-line and the pulse-to-pulse overlaps, where larger overlap leads to lower roughness. Process optimization indicates that while operating with laser processing parameters resulting in the highest MRR, the best ratio between the MRR and surface roughness appears at ~50% overlap of the laser pulses, regardless of the material being processed. laser ablation engraving fiber lasers material removal rate laser-material interaction laserska ablacija graviranje vlakenski laserji true false true Angleški jezik Slovenski jezik Članek v reviji 2022-01-12 14:10:25 2022-01-12 14:10:31 2022-12-07 03:32:22 0000-00-00 00:00:00 2022 0 0 19 str. iss. 2, art. 232 Vol. 12 Jan. 2022 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 535 2079-4991 10.3390/nano12020232 93100547 Hribar_et_al_Nanomaterials.pdf Hribar_et_al_Nanomaterials.pdf 1 3275CF95511C0357E20B84686E3B0FE3 29d81272974c7273afcc91eb42a43d0c584c79ca05869df0e72078c8e96a291d 637ec9a7-754b-11ed-9c94-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=164547 https://www.mdpi.com/2079-4991/12/2/232 1 d78ff098-73a8-11ec-abdb-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=152807 Fakulteta za strojništvo 0 0 0