Ablation and morphological evolution of micro-holes in stainless steel with picosecond laser pulses

Zhao, Wanqin; Wang, Wenjun; Jiang, Gedong; Li, Ben Q.; Mei, Xuesong

doi:10.1007/s00170-015-7145-8

Cited by 40 publications

(14 citation statements)

References 37 publications

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“…By calculating the inverse logarithm, the average ablation threshold F th , the ablation threshold F th (a), and the thermal threshold F th (t) were obtained for multiple pulse groups. Finally, the single-pulse threshold was determined according to the empirical incubation model [22]. Differences in the hole dimensions between the four metals illustrated in Figure 2, may be associated with the thresholds of ablated metals by the ultra-short pulsed laser.…”

Section: Hole Dimensions In Different Metalsmentioning

confidence: 99%

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Percussion Drilling Hole in Cu, Al, Ti and Ni Alloys Using Ultra-Short Pulsed Laser Ablation

et al. 2019

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Comparative study on micro-deep hole drilling by picosecond ultra-short pulse laser in four metals, including copper, aluminum alloy, titanium alloy, and nickel alloy, was presented. Destructive testing was performed to measure the depth, shape, and side-wall morphology of micro-deep holes in this study. Diameters and depths of micro-deep holes in four metals ablated using the same processing parameters were compared. The multiple thresholds of metals had been calculated. Relationships between hole dimensions and multiple thresholds (the average ablation threshold, the ablation threshold and the thermal threshold) and physical properties (for example, the heat capacity, the melting temperature, the optical penetration depth and the absorbance, etc.) of the four metals are examined. Furthermore, the surface and side-wall morphologies of the micro-deep holes in four metals were demonstrated. The influence mechanisms, especially the side-wall morphology, were discussed, such as the thresholds, conical emission, self-cleaning effect, physical properties of metals, the energy transmission, the plasma effect, thermochemical reaction, and so on.

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Section: Hole Dimensions In Different Metalsmentioning

confidence: 99%

“…Finally, the single-pulse threshold was determined according to the empirical incubation model [22]. A comparison of the average ablation threshold F th , ablation threshold F th (a), and thermal threshold F th (t) with single-pulse of the four metals are presented in Figure 4.…”

Section: Hole Dimensions In Different Metalsmentioning

confidence: 99%

Percussion Drilling Hole in Cu, Al, Ti and Ni Alloys Using Ultra-Short Pulsed Laser Ablation

et al. 2019

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“…There is an array of micro funnel-shaped through hole on the filter, with the aperture of microholes about 55 μm. Such funnel shape was due to Gaussian laser ablation3334. The edges of adjacent microholes overlapped partially and formed a ridge structure.…”

Section: Resultsmentioning

confidence: 99%

A highly efficient, stable, durable, and recyclable filter fabricated by femtosecond laser drilling of a titanium foil for oil-water separation

Cao

Wang

et al. 2016

Sci Rep

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It has been a long standing challenge to efficiently separate oil and water since prehistoric times, and now it has become even more desirable in oily wastewater purification and oil spill cleanup. Here we introduce a super oil–water separation filter with superhydrophilicity and underwater superoleophobicity, fabricated using femtosecond laser micro-hole drilling of a titanium foil. Such a simply-made filter, without any modification, can achieve a separation efficiency exceeding 99% in eight typical oil–water mixtures. It remains highly efficient after 40 cycles of recycling and after suffering erosion by corrosive media. Furthermore, the used filter, polluted with oil, could be recovered by ultraviolet illumination. The flux of filtered water is tunable by simply selecting the aperture of the microhole or the spacing between adjacent microholes. Such advanced functionality is due to roughness and the TiO2 layers on the ablated surface during fabrication. With superhydrophilic and superoleophobic surfaces, this oil-water filer is also suitable for applications in anti-fouling, anti-smudge, anti-fog, and self-cleaning.

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“…For example, there would be a largest hole with a diameter of 36.6 μm when the fluence was 1.32 J/cm 2 . The thresholds of Ni-based superalloy and the single-pulse threshold have been calculated based on the fracture diameter method and the empirical incubation model, respectively (The detailed computation mothed can be found in references of [ 22 , 23 ]). The results have been shown in Figure 3 b and it could be found that the threshold decreased gradually with the increase of pulses.…”

Section: Resultsmentioning

confidence: 99%

Percussion Drilling of Deep Holes Using Picosecond Ultrashort Pulse Laser in Ni-Based Superalloy Coated with Ceramic Thermal Barrier Coatings

et al. 2020

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Ni-based superalloy with ceramic thermal barrier coatings (TBCs) is a composite material, which can be used in special environments with high temperature and high pressure such as aeroengine blade. In order to improve the cooling effect of the aeroengine, it is necessary to perform multi-size and large-area holes processing on the surface of blades. As a non-contact processing method with fast processing speed, good processing quality and almost no deformation, laser processing has been one of the important processing methods for film cooling hole processing of aeroengine blades. Percussion drilling is presented using picosecond ultrashort pulse laser in order to explore processing of deep holes in Ni-based superalloy, ceramic TBCs, and ceramic TBCs/substrate multilayer material. The effects of pulses, threshold and wavelength on hole diameter have been discussed, and the experiment on the deep hole ablation with 1064 nm wavelength has been performed. By analyzing the hole size and morphological characteristics of multiple processing parameters, the variation of hole cylindricity is obtained. A high-quality hole, without spatters around the periphery of hole entrance and without recast layer on the side-wall surface, in Ni-based superalloy coated with ceramic TBCs has been drilled. This research has potential applications to blade film cooling holes.

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Ablation and morphological evolution of micro-holes in stainless steel with picosecond laser pulses

Cited by 40 publications

References 37 publications

Percussion Drilling Hole in Cu, Al, Ti and Ni Alloys Using Ultra-Short Pulsed Laser Ablation

Percussion Drilling Hole in Cu, Al, Ti and Ni Alloys Using Ultra-Short Pulsed Laser Ablation

A highly efficient, stable, durable, and recyclable filter fabricated by femtosecond laser drilling of a titanium foil for oil-water separation

Percussion Drilling of Deep Holes Using Picosecond Ultrashort Pulse Laser in Ni-Based Superalloy Coated with Ceramic Thermal Barrier Coatings

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