A study on film hole drilling of IN718 superalloy via laser machining combined with high temperature chemical etching

Zhang, Qiang; Sun, Shufeng; Zhang, Fengyun; Wang, Jin; qiangqiang, Lv; Shao, Yong; Liu, Qingyu; Shao, Jing; Liu, Xin-Fu; Zhang, Yan

doi:10.1007/s00170-019-04541-0

Cited by 20 publications

(5 citation statements)

References 29 publications

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“…Sun et al [ 9 ] proposed and studied the discharge drilling method using the spiral micro-electrode, and completed the processing and preparation of high-precision micro-porous structures on the surface of nickel-based alloy. In addition, Zhang et al [ 10 ] proposed a laser processing with high-temperature chemical etching method to complete the high-quality surface micro-porous structures processing of Inconel 718 under different processing media. However, due to the non-directionality and complexity of the combination of laser and chemical reaction, the honeycomb structure was generated during the processing.…”

Section: Introductionmentioning

confidence: 99%

Anodic Dissolution Characteristics of GH4169 Alloy in NaNO3 Solutions by Roll-Print Mask Electrochemical Machining Using the Linear Cathode

Qin,

Li,

Han

et al. 2024

Materials

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GH4169 alloy/Inconel 718 is extensively utilized in aerospace manufacturing due to its excellent high temperature mechanical properties. Micro-structuring on the workpiece surface can enhance its properties further. Through-mask electrochemical micromachining (TMEMM) is a promising and potential processing method for nickel-based superalloys. It can effectively solve the problem that traditional processing methods are difficult to achieve large-scale, high-precision and efficiency processing of surface micro-structure. This study explores the feasibility of electrochemical machining (ECM) for GH4169 using roll-print mask electrochemical machining with a linear cathode. Electrochemical dissolution characteristics of GH4169 alloy were analyzed in various electrolyte solutions and concentrations. Key parameters including cathode sizes, applied voltage and corrosion time were studied in the roll-print mask electrochemical machining. A qualitative model for micro-pit formation on GH4169 was established. Optimal parameters were determined through experiments: 300 μm mask hole and cathode size, 10 wt% NaNO3 electrolyte, 12 V voltage, 6 s corrosion time. The results demonstrate that the micro-pits with a diameter of 402.3 μm, depth of 92.8 μm and etch factor (EF) of 1.81 show an excellent profile and localization.

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Section: Introductionmentioning

confidence: 99%

Anodic Dissolution Characteristics of GH4169 Alloy in NaNO3 Solutions by Roll-Print Mask Electrochemical Machining Using the Linear Cathode

Qin,

Li,

Han

et al. 2024

Materials

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“…The results show that underwater laser drilling can obtain a better hole taper and better surface quality. Zhang et al 28 selected a chemical solution that reacts rapidly with materials at high temperatures for laser machining combined with high-temperature chemical etching to drill IN718 superalloy. The results show that the micropores processed under the action of hightemperature chemical liquid etching show fewer defects, and the taper of the microhole machined by optimizing the defocus amount is smaller than that in other media.…”

Section: Introductionmentioning

confidence: 99%

“…The results show that underwater laser drilling can obtain a better hole taper and better surface quality. Zhang et al 28 . selected a chemical solution that reacts rapidly with materials at high temperatures for laser machining combined with high‐temperature chemical etching to drill IN718 superalloy.…”

Section: Introductionmentioning

confidence: 99%

A study of laser machining combined with dynamic chemical etching in micro‐hole drilling of 2.5D SiC_f/SiC composites

Zhao

Sun

Zhang

et al. 2023

Int J Applied Ceramic Tech

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In this study, we used a novel method of laser machining combined with dynamic chemical liquid etching (LMDCE) to drill holes in 2.5D SiCf/SiC ceramic matrix composites (CMC‐SiC). A chemical solution that could quickly remove the recast layer without damaging the substrate was selected. Severe recast layer and microcrack defects were observed when laser machining was performed in the air. The surface of the material was highly carbonized due to the thermal effect of the laser. The effect of different defocus amounts and scanning speeds on the hole taper was studied. A lower scanning speed can ensure that a smaller taper is obtained by the microhole. The bore diameter of the holes processed with a defocusing amount of 0 or −1 mm is more uniform. The results show that with the assistance of a dynamic chemical solution, the fibers break neatly into needle‐like shapes, the thermal effect of the laser on the ceramic substrate is significantly weakened, the microhole shows good roundness, and there are no recast layers and oxides on the sample surface. In addition, microcracks are significantly reduced, and high‐quality microholes without a heat‐affected zone (HAZ) are machined. The method provides a new idea on how to eliminate machining defects and achieve higher‐quality micromachining for ceramic matrix composites.

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“…The air lm hole cooling technology is the main cooling technology applied to engine blades at this stage. However, the air lm hole processing is prone to thermal effects, forming micro-cracks, remelting recast layer and other defects, causing some damage to the surface integrity of the air lm cooling hole [4][5][6][7]. Femtosecond laser pulse widths are extremely short and suppress thermal diffusion, and it has minimal thermal effect on the material compared to conventional processes.…”

Section: Introductionmentioning

confidence: 99%

Optimization of femtosecond laser drilling process for DD6 single crystal alloy

Du¹,

Liang²,

Yu³

et al. 2022

Preprint

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In this paper, we explore the optimal combination of femtosecond laser drilling parameters for micro-hole processing on DD6 single-crystal high-temperature alloy and analyze the significance of parameter variations on the microstructure characteristics of the holes. The L25(56) orthogonal test was performed by controlling six parameters during femtosecond laser ring processing: Average power, Overlap rate, Defocus rate, Feed amount, Gas pressure, and End position. It is found that the entrance of the micro-holes has good roundness, while a large variation in diameter is observed. The exit of the holes exhibits poor roundness, and the diameter variation is intensified compared with the entrance, there are some with jagged edges. After the extreme difference analysis, it is concluded that the defocus has the most significant effect on the hole drilling by femtosecond laser ring processing for DD6 single crystal high-temperature alloy. The increase of laser average power leads to the decrease of hole taper, and the feed of 0.02 mm is beneficial for processing small taper through-hole. In addition, the outlet diameter of the holes increases with the increasing of gas pressure after the pressure is greater than 0.25 MPa, and the effect of the end is smaller and other regular conclusions. Through the integrated equilibrium method, the optimized combination of the femtosecond laser drilling parameters for 400 µm through-hole with minimum taper is as follows: power 7.84 W, overlap 99%, defocus + 0.4 mm, pressure 0.25 MPa, feed 0.02 mm and end + 0.2 mm.

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A study on film hole drilling of IN718 superalloy via laser machining combined with high temperature chemical etching

Cited by 20 publications

References 29 publications

Anodic Dissolution Characteristics of GH4169 Alloy in NaNO3 Solutions by Roll-Print Mask Electrochemical Machining Using the Linear Cathode

Anodic Dissolution Characteristics of GH4169 Alloy in NaNO3 Solutions by Roll-Print Mask Electrochemical Machining Using the Linear Cathode

A study of laser machining combined with dynamic chemical etching in micro‐hole drilling of 2.5D SiC_f/SiC composites

Optimization of femtosecond laser drilling process for DD6 single crystal alloy

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A study on film hole drilling of IN718 superalloy via laser machining combined with high temperature chemical etching

Cited by 20 publications

References 29 publications

Anodic Dissolution Characteristics of GH4169 Alloy in NaNO3 Solutions by Roll-Print Mask Electrochemical Machining Using the Linear Cathode

Anodic Dissolution Characteristics of GH4169 Alloy in NaNO3 Solutions by Roll-Print Mask Electrochemical Machining Using the Linear Cathode

A study of laser machining combined with dynamic chemical etching in micro‐hole drilling of 2.5D SiCf/SiC composites

Optimization of femtosecond laser drilling process for DD6 single crystal alloy

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A study of laser machining combined with dynamic chemical etching in micro‐hole drilling of 2.5D SiC_f/SiC composites