High power ultra-short pulse laser ablation of IN718 using high repetition rates

Finger, Johannes; Kalupka, Christian; Reininghaus, Martin

doi:10.1016/j.jmatprotec.2015.07.014

Cited by 47 publications

(17 citation statements)

References 28 publications

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“…Instead, molten grooves located at the parallel lines of the focus spot moving across the surface are observed [37] . Depending on the repetition rate, different structure formation processes are dominating, and high pulse repetition rate laser systems form other structural motifs on the surface with matching laser parameter sets [39,40] . The limits are roughly characterized around f <250 kHz; 250 kHz–5 MHz; 5–7 MHz; >7 MHz [40] .…”

Section: Resultsmentioning

confidence: 99%

“…Depending on the repetition rate, different structure formation processes are dominating, and high pulse repetition rate laser systems form other structural motifs on the surface with matching laser parameter sets [39,40] . The limits are roughly characterized around f <250 kHz; 250 kHz–5 MHz; 5–7 MHz; >7 MHz [40] . Here, we reduced the laser fluence until the occurrence of molten/milled grooves was absent to ensure a homogeneous surface.…”

Section: Resultsmentioning

confidence: 99%

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Formation of Titanium Nitride, Titanium Carbide, and Silicon Carbide Surfaces by High Power Femtosecond Laser Treatment

Fedorov

Lederle

et al. 2021

ChemPlusChem

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Coatings based on titanium nitrides, titanium carbides and silicon carbides can optimize the surface properties of titanium or silicon for various applications ranging from biocompatibility to chemical stability and durability. Here, we investigated a high power (100 W) high pulse repetition rate femtosecond laser process (λ=1030 nm, τ=750 fs, f=1 MHz) for the treatment of titanium and silicon in atmospheres of argon, nitrogen, methane, ethene and acetylene. In a nitrogen atmosphere, a homogeneous coating of TiON is formed on titanium. In an ethene/argon atmosphere coatings of TiOC and SiC are formed on Ti and Si, respectively. The process allows a fast surface transformation with a process rate of 0.33 cm2 s−1 and a high spatial resolution below 0.5 mm with a minimal heat affected zone at the same time. In contrast to low repetition rate femtosecond laser processed samples, the surfaces are more robust against mechanical impact. At the same time, the surfaces reveal a distinct microstructure in comparison to coatings obtained by vapor deposition techniques.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Formation of Titanium Nitride, Titanium Carbide, and Silicon Carbide Surfaces by High Power Femtosecond Laser Treatment

Fedorov

Lederle

et al. 2021

ChemPlusChem

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“…The largest structure height was produced at v scan = 500 mm/s and λ = 0.3 mm (h = 3.07 µm). The magnification factor ∆h was calculated as the quotient of structure height h (v scan = j•100 mm/s; n = j) and structure height at v scan = 100 mm/s and n = 1 according to Equation (2): ∆h = h (v scan = j•100 mm/s; n = j) h (v scan = 100 mm/s; n = 1) ; j ∈ [2, 3,4,5].…”

Section: Influence Of Scan Speed and Number Of Passes At Constant Processing Timementioning

confidence: 99%

“…The track offset is set to dy = 12 µm at the scan speed v scan = 100 mm/s, so that a significant track overlap is ensured even at the laser power minimum (Figure 4). For higher scan speeds, the track offset is adapted in each case according to Equation (3) and is shown in Table 3. In this case, the examined wavelengths are λ = 0.2 mm, λ = 0.3 mm, and λ = 0.4 mm.…”

Section: Areal Structuring and Track Offsetmentioning

confidence: 99%

“…Additionally, laser ablation by ultrashort pulses is a topic of high scientific and potentially industrial relevance. For example, Finger et al [3] showed that high-precision surface modifications are feasible without excessively increasing surface roughness using fs laser pulses. Nonetheless, laser ablation is still a subtractive method in this regard similar to traditional mechanical techniques and material is lost during processing.…”

Section: Introductionmentioning

confidence: 99%

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Surface Structuring by Laser Remelting (WaveShape): Microstructuring of Ti6Al4V for a Small Laser Beam Diameter and High Scan Speeds

Temmler

2021

Micromachines

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The appearance of a surface is a crucial characteristic of a part or component. Laser-based micromachining gets increasingly important in generating tailored surface topographies. A novel structuring technique for surface engineering is surface structuring by laser remelting (WaveShape), in which surface features are created without material loss. In this study, we investigated the evolution of surface topographies on Ti6Al4V for a laser beam diameter of 50 m and scan speeds larger than 100 mm/s. Surface features with aspect ratios (ratio of height to width) of almost 1:1 were achieved using the WaveShape process. Furthermore, wavelengths smaller than 500 m could be effectively structured using scan speeds of up to 500 mm/s. The experimental results showed further that the efficiency of the WaveShape process in terms of achieved structure height per unit time significantly increases for high scan speeds.

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Fundamentals of Scanning Surface Structuring by Ultrashort Laser Pulses: From Electron Diffusion to Final Morphology

Nyenhuis

Terekhin

Menold

et al. 2022

Advanced Photonics Research

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High power ultra-short pulse laser ablation of IN718 using high repetition rates

Cited by 47 publications

References 28 publications

Formation of Titanium Nitride, Titanium Carbide, and Silicon Carbide Surfaces by High Power Femtosecond Laser Treatment

Formation of Titanium Nitride, Titanium Carbide, and Silicon Carbide Surfaces by High Power Femtosecond Laser Treatment

Surface Structuring by Laser Remelting (WaveShape): Microstructuring of Ti6Al4V for a Small Laser Beam Diameter and High Scan Speeds

Fundamentals of Scanning Surface Structuring by Ultrashort Laser Pulses: From Electron Diffusion to Final Morphology

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