Coaxial waterjet-assisted laser drilling of film cooling holes in turbine blades

Liu, Y.Z.

doi:10.1016/j.ijmachtools.2019.103510

Cited by 43 publications

(9 citation statements)

References 41 publications

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“…It is found that the Ra of the micro pits around the hole entrance is close to the substrate material when measured at a multiple of ×200. In addition, due to the distribution of laser energy on the substrate material and the shielding effect of the plasma plume on the laser beam, the formation of a taper angle in laser machining is inevitable [ 11 , 32 ]. The taper angle of the machined holes was reduced by 106%, with a taper angle of 3.38° and 1.64° of holes obtained by laser machining in air and CWALSM, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…Under the same temperature rise, the heat absorbed by water is much greater than that of the target material. The remaining laser energy in the target material is mainly absorbed by fluid water during heat conduction and then taken away [ 11 ]. Therefore, water-assisted laser machining can avoid excessive oxidation, thermal stress, HAZ, and other damage during machining.…”

Section: Introductionmentioning

confidence: 99%

“…Wang et al [ 32 ] proposed an immersion waterjet-assisted laser micromachining technology, using a 527 nm nanosecond pulse laser with less energy attenuation in water, and verified through experiments that the machining quality of this technology is better than that in air. Liu [ 11 ] conducted an experimental study on coaxial waterjet-assisted laser film cooling hole machining of nickel-based single-crystal superalloy. The microstructure of the sidewall of the film cooling hole was studied by transmission electron microscope (TEM), and it was found that the thickness of the heat-affected zone decreased with the increase of the waterjet speed.…”

Section: Introductionmentioning

confidence: 99%

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Experimental Study on Coaxial Waterjet-Assisted Laser Scanning Machining of Nickel-Based Special Alloy

Wang

Yuan

et al. 2023

Micromachines

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The problems of the recast layer, oxide layer, and heat-affected zone (HAZ) in conventional laser machining seriously impact material properties. Coaxial waterjet-assisted laser scanning machining (CWALSM) can reduce the conduction and accumulation of heat in laser machining by the high specific heat capacity of water and can realize the machining of nickel-based special alloy with almost no thermal damage. With the developed experimental setup, the laser ablation threshold and drilling experiments of the K4002 nickel-based special alloy were carried out. The effects of various factors on the thermal damage thickness were studied with an orthogonal experiment. Experimental results have indicated that the ablation threshold of K4002 nickel-based special alloy by a single pulse is 4.15 J/cm2. The orthogonal experiment results have shown that the effects of each factor on the thermal damage thickness are in the order of laser pulse frequency, waterjet speed, pulse overlap rate, laser pulse energy, and focal plane position. When the laser pulse energy is 0.21 mJ, the laser pulse frequency is 1 kHz, the pulse overlap is 55%, the focal plane position is 1 mm, and the waterjet speed is 6.98 m/s, no thermal damage machining can be achieved. In addition, a comparative experiment with laser drilling in the air was carried out under the same conditions. The results have shown that compared with laser machining in the air, the thermal damage thickness of CWALSM is smaller than 1 μm, and the hole taper is reduced by 106%. There is no accumulation and burr around the hole entrance, and the thermal damage thickness range is 0–0.996 μm. Furthermore, the thermal damage thickness range of laser machining in the air is 0.499–2.394 μm. It has also been found that the thermal damage thickness is greatest at the entrance to the hole, decreasing as the distance from the entrance increases.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Experimental Study on Coaxial Waterjet-Assisted Laser Scanning Machining of Nickel-Based Special Alloy

Wang

Yuan

et al. 2023

Micromachines

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“…25-100 mm [3]. Moreover, the waterjet can also minimise the undesired thermal effect by continuously cooling the sample during the cutting process and so to reduce the surface damage [4].…”

Section: Introductionmentioning

confidence: 99%

Surface formation mechanism in waterjet guided laser cutting of a Ni-based superalloy

Liao

Axinte

et al. 2021

CIRP Annals

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Waterjet guided laser (WJGL) cutting is a relatively new technology for high-precision machining of difficult-to-cut materials. However, its material removal mechanism presents some unique features because of the interaction between laser, waterjet and workpiece. This paper investigates the surface formation mechanism in WJGL cutting of Ni-based superalloy and its influence on the fatigue performance. Two different microstructures have been found on the surface layer, i.e. recast crystals and redeposited amorphous oxide, resulting from solidification of melt and plasma respectively under the laser-waterjet interaction. Mechanical twinning structures were also revealed in the substrate due to the waterjet confined plasma shockwave impact.

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“…Film-cooling holes have a small diameter (about 0.2–0.8 mm), high aspect ratio, and complex spatial angle; therefore, they must be processed with a high precision and efficiency. Many methods, such as the electric discharge machining method [ 16 ], coaxial water-jet-assisted machining method [ 17 ], electrochemical drilling method [ 18 ], and picosecond laser processing [ 19 ], have been used for processing the film-cooling holes of turbine blades; however, these methods are associated with problems such as a large heat-affected zone, low geometric accuracy, and uneven quality. Femtosecond lasers can solve these problems, but their processing efficiency is low.…”

Section: Introductionmentioning

confidence: 99%

Throughput Improvement in Femtosecond Laser Ablation of Nickel by Double Pulses

et al. 2021

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In this study, femtosecond laser double pulses were tested to improve their nickel ablation efficiency. The experimental results indicated that compared with single pulses, double pulses with different delay times generated craters with larger diameters and depths. The results obtained for three sets of double pulses with different energy ratios indicated that double pulses with an energy ratio of 1:9 had the highest ablation efficiency, followed by those with energy ratios of 2:8 and 5:5. The double pulses with the aforementioned three energy ratios achieved the maximum ablation efficiency when the delay time was 3–4 ps. Compared with single pulses, double pulses with an energy ratio of 1:9 generated craters with an up to 34% greater depth and up to 14% larger diameter. In addition, an interference effect was observed with a double pulse delay time of 0 ps, which has seldom been reported in the literature. The double pulses were simulated using the two-temperature model. The simulation results indicated that double pulses with an energy ratio of 1:9 with a delay time of 4 ps can perform the strongest ablation. These simulation results are in line with the experimental results.

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Coaxial waterjet-assisted laser drilling of film cooling holes in turbine blades

Cited by 43 publications

References 41 publications

Experimental Study on Coaxial Waterjet-Assisted Laser Scanning Machining of Nickel-Based Special Alloy

Experimental Study on Coaxial Waterjet-Assisted Laser Scanning Machining of Nickel-Based Special Alloy

Surface formation mechanism in waterjet guided laser cutting of a Ni-based superalloy

Throughput Improvement in Femtosecond Laser Ablation of Nickel by Double Pulses

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