Removal of recast layer in the laser drilled film cooling holes by a two-step inner streaming electrochemical technique

Duan, Wenqiang; Mei, Xuesong; Fan, Zhengjie; Liu, Bin; Wang, Rujia; Jun, Martin B. G.

doi:10.1088/1361-6439/ac0516

Cited by 7 publications

(2 citation statements)

References 25 publications

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“…However, laser processing is a high-speed thermal shock process, with high density heat rapidly concentrated in a small processing range, resulting in local temperature of up to tens of thousands of degrees Celsius within a very short time, which leads to material gasification and melting, thereby producing a large amount of molten material. If the molten material cannot be completely eliminated, it will be cooled and re-solidified around the processing path to form a recast layer [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation study of ultraviolet nanosecond laser ablation of Cu-Al2O3 dispersion strengthened alloys

Wang,

Wu,

et al. 2023

Int J Adv Manuf Technol

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A finite element model of nanosecond laser interaction with the Cu-Al2O3 dispersion strengthened alloys has been established according to the underlying mechanism of melting flow, phase transition and evaporation removal of material. Attempting to replicate the multi-field coupling effects in laser ablation process, this model takes both the thermophysical properties of materials varied with the temperature, and the evolution of erosion morphology under the instantaneous high-temperature action of pulsed laser into consideration. Moreover, the influence of coaction of diverse forces (including recoil pressure, surface tension, Marangoni force), the phase transformation and melting flow of material on the laser processing were also integrated into the model. On the basis of the proposed model, a FEM simulation study on the distribution of temperature field, formation process of erosion morphology, and numerical prediction of ablation depth in laser processing was performed. The deviation of the predicted values of ablation depth from the experimental results under the same power condition as the simulations can be controlled within 13%, indicating that the proposed simulation model can be adopted to effectively predict the width of heat affected zone and the width of recast layer under specific processing parameters.

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Section: Introductionmentioning

confidence: 99%

Numerical simulation study of ultraviolet nanosecond laser ablation of Cu-Al2O3 dispersion strengthened alloys

Wang,

Wu,

et al. 2023

Int J Adv Manuf Technol

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“…Thus, compared with laser processing, results showed that there was no sputtering on the surface of the material processed by LECM, and there was no recast layer on the side wall of the micro holes. Duan et al [15] found that laser processing in oxidation-assisted gases may generate an oxide insulating layer, the subsequent electrochemical corrosion could not preferentially dissolve the recast layer. Using non-oxidation-assisted gases, an ideal hole shape with smooth sidewalls can be obtained, and the inner surface was smoother.…”

Section: Introductionmentioning

confidence: 99%

Feasibility study of laser and in-situ ECM of array holes

Shao

Yang

Wang

et al. 2022

Seventeenth National Conference on Laser Technology and Optoelectronics

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Aiming at the issues of low machining efficiency and difficulty in keeping consistency of machining accuracy of micro array holes with high surface quality. This paper proposed a laser and in-situ electrolytic machining technology for processing array holes, which utilized the advantages of high laser machining efficiency and good surface quality electrochemical machining (ECM). Firstly, laser was used to perform high-efficiency drilling of prefabricated micro array holes on workpieces that was covered with insulating layer, and then the recast layer and taper of prefabricated holes were removed by ECM. To verify the feasibility of the proposed method, laser prefabricated of the array holes with the diameter of 0.8 mm and the in-situ electrolytic recast layer removal were carried out on the Inconel 718 workpiece. Influences of laser scanning speed, defocusing distance, scanning times and insulating plate thickness on the taper of prefabricated hole were investigated experimentally. The optimized laser processing parameters were as follows: scanning speed 60 mm/s, defocusing distance 1.5 mm, scanning times 50, and insulating plate thickness 0.4mm. Results of in-situ ECM showed that the recast layer on the surface of the laser processed holes could be removed, indicating that the laser and in-situ ECM could achieve high efficiency and high precision machining of micro array holes without recast layer.

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Study on anodic dissolution behavior and surface evolution of laser-drilled Ni-based superalloys during electrochemical post-processing

Bao,

Wang,

Wang

et al. 2024

Electrochimica Acta

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Removal of recast layer in the laser drilled film cooling holes by a two-step inner streaming electrochemical technique

Cited by 7 publications

References 25 publications

Numerical simulation study of ultraviolet nanosecond laser ablation of Cu-Al2O3 dispersion strengthened alloys

Numerical simulation study of ultraviolet nanosecond laser ablation of Cu-Al2O3 dispersion strengthened alloys

Feasibility study of laser and in-situ ECM of array holes

Study on anodic dissolution behavior and surface evolution of laser-drilled Ni-based superalloys during electrochemical post-processing

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