Picosecond laser pulse polishing of ASP23 steel

Chen, Yuan-Di; Tsai, W. J.; Liu, Sung-Ho; Horng, Ji-Bin

doi:10.1016/j.optlastec.2018.05.025

Cited by 40 publications

(15 citation statements)

References 32 publications

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“…As shown in Figure 3 , the surrounding area of the holes was covered by randomly distributed recast material. To remove these inhomogeneous bulges and smoothen the surface, a second DLW step was optimized to laser-polish the sample surface [ 39 , 40 ]. The DLW treated surface was scanned with a line-like laser path and with varying fluence from 0.42 µJ/cm² to 4.2 µJ/cm².…”

Section: Resultsmentioning

confidence: 99%

Hierarchical Microtextures Embossed on PET from Laser-Patterned Stamps

et al. 2021

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Nowadays, the demand for surface functionalized plastics is constantly rising. To address this demand with an industry compatible solution, here a strategy is developed for producing hierarchical microstructures on polyethylene terephthalate (PET) by hot embossing using a stainless steel stamp. The master was structured using three laser-based processing steps. First, a nanosecond-Direct Laser Writing (DLW) system was used to pattern dimples with a depth of up to 8 µm. Next, the surface was smoothed by a remelting process with a high-speed laser scanning at low laser fluence. In the third step, Direct Laser Interference Patterning (DLIP) was utilized using four interfering sub-beams to texture a hole-like substructure with a spatial period of 3.1 µm and a depth up to 2 µm. The produced stamp was used to imprint PET foils under controlled temperature and pressure. Optical confocal microscopy and scanning electron microscopy imaging showed that the hierarchical textures could be accurately transferred to the polymer. Finally, the wettability of the single- and multi-scaled textured PET surfaces was characterized with a drop shape analyzer, revealing that the highest water contact angles were reached for the hierarchical patterns. Particularly, this angle was increased from 77° on the untreated PET up to 105° for a hierarchical structure processed with a DLW spot distance of 60 µm and with 10 pulses for the DLIP treatment.

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Section: Resultsmentioning

confidence: 99%

Hierarchical Microtextures Embossed on PET from Laser-Patterned Stamps

et al. 2021

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“…This method does not require any mechanical abrasives or polishing tools and can polish surfaces with very complex topography that are difficult or impossible to polish with conventional polishing methods . Laser polishing has so far been used to polish a variety of materials, including diamonds, glass, ceramics, and various metals . However, there are few studies on laser‐polished polymers, and the effects of laser polishing on the surface quality and mechanical properties of polymers are worthy of attention.…”

Section: Introductionmentioning

confidence: 99%

Laser polishing of Cu/PLA composite parts fabricated by fused deposition modeling: Analysis of surface finish and mechanical properties

et al. 2019

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Fused deposition modeling (FDM) technology decreases production time and cost in engineering industry, but with typical low surface quality. In this study, laser polishing was employed to improve surface quality of copper fiber/polylactide acid (Cu/PLA) composite parts fabricated by FDM. Surface roughness, surface morphology, dynamic mechanical analysis (DMA), and tensile properties were studied. The results showed that after laser polishing, the surface roughness was reduced by more than 91% (from 10.52 to 0.87 μm Sa) at the optimized parameters (the laser power of 5 W and the laser beam diameter of 200 μm). Laser polishing can effectively remove surface defects formed during FDM. DMA showed that the storage modulus, loss modulus, and glass transition temperature of Cu/PLA composites were significantly improved, because the Cu fibers and PLA matrix formed a strong interfacial adhesion after treatment. Moreover, the tensile strength and Young's modulus of the Cu/PLA composites sample also improved by laser polishing. The fracture morphologies were observed, and the possible strengthening mechanism was also discussed.

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“…The pulse width plays also a major role in material laser processing [42,43,44,45]. The effect of pulse width on micro-hardness distribution is shown in Figure 10.…”

Section: Resultsmentioning

confidence: 99%

Experimental and Numerical Study of AISI 4130 Steel Surface Hardening by Pulsed Nd:YAG Laser

et al. 2019

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Laser surface transformation hardening (LSTH) of AISI 4130 was investigated by a Nd:YAG pulsed laser. Laser focal height (LFH), pulse width (LPW), scanning speed (LSS), and power (LP) varied during the experiments. The microstructure of the treated zone was characterized by optical (OM) and field emission scanning electron microscopy (FESEM). Micro-hardness was measured in the width and depth directions. Results showed that the hardness and depth of hardened layer increased by decreasing the LSS and the laser focal position (LFP), and by increasing the LPW. The results were compared with those obtained by furnace heat treatment of the same steel. Eventually, a finite element model was employed for the simulation of the LSTH of AISI 4130 steel and calculation of the heat-treated zone. The results showed that the model can predict with accuracy the temperature profile and the size and the shape of the laser hardened region.

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Picosecond laser pulse polishing of ASP23 steel

Cited by 40 publications

References 32 publications

Hierarchical Microtextures Embossed on PET from Laser-Patterned Stamps

Hierarchical Microtextures Embossed on PET from Laser-Patterned Stamps

Laser polishing of Cu/PLA composite parts fabricated by fused deposition modeling: Analysis of surface finish and mechanical properties

Experimental and Numerical Study of AISI 4130 Steel Surface Hardening by Pulsed Nd:YAG Laser

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