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

Liao, Zhirong; Xu, Dongdong; Axinte, Dragoş; Diboine, Jérémie; Wretland, Anders

doi:10.1016/j.cirp.2021.03.007

Cited by 18 publications

(4 citation statements)

References 7 publications

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“…The regression line of laser pulse frequency and waterjet speed is steep, which significantly impacts thermal damage thickness, and reducing laser pulse frequency or increasing waterjet speed can reduce thermal damage thickness. This is because most of the heat in the machining area is absorbed by water during the laser pulse-off time, which reduces the heat transfer and accumulation of the material [ 46 ]. At the same time, the high-speed waterjet with a stronger cooling effect and initial kinetic energy can take away the ablated material in the machining area, reducing the formation of the recast layer.…”

Section: Resultsmentioning

confidence: 99%

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%

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

Wang

Yuan

et al. 2023

Micromachines

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“…Eventually, water accumulates and forms a water layer on the substrate surface, as shown in Figure 9(b), and the continuous compensation of the water jet makes the water layer persist. The water layer prevents melt ejection from the groove, which causes the melt and the vapor/plasma plume to solidify in the groove to form the recast layer and the redeposition layer [27]. During underwater machining, the velocity of the ejected particles is much lower than that in the air due to the liquid viscosity [28].…”

Section: Mechanism Of Burr Formation In Wjgl Ablation Metalmentioning

confidence: 99%

Annular gas-assisted water jet guided laser manufacturing groove structure of Inconel 718 alloy

Zhao¹,

Zhao

Zhao³

et al. 2023

Preprint

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Inconel 718 offers high oxidation resistance, mechanical strength, and heat resistance, which enables turbofan engines to maintain excellent performance in an operating environment of 1000°C. These properties make Inconel 718 difficult to machine by conventional machining techniques. Water jet guided laser (WJGL) is a composite processing technology that combines water cooling and laser processing technology. Therefore, it is advantageous and promising in processing Inconel 718. However, the water layer on the substrate surface in processing limits WJGL 's ability to ablate the metal, which leads to burrs formed when manufacturing groove structures. Therefore, a new method for manufacturing groove structure on Inconel 718 by Annular gas-assisted water jet guided laser (AGAWJGL) is proposed in this paper. This method reduces burrs and improves material removal efficiency by removing the water layer from the substrate surface with the gas-assisted. Then, groove processing experiment are performed on Inconel 718 alloy sheets with thickness of 1 mm. The experimental results show that the average size of burrs reduces 36%, and the depth of grooves increases 13%. These provide the theoretical foundation for the WJGL machining of Inconel 718.

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“…Water-guided laser cutting technology is a new cutting method that uses a water beam to guide the laser to the machined surface. The processing principle is shown in Figure 4 [14][15][16]. It has attracted extensive attention from many researchers due to its small heat-affected zone, high precision, and lack of pollution.…”

Section: Water-guided Laser Processingmentioning

confidence: 99%

Research Progress of Water–Laser Compound Machining Technology

et al. 2022

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As an emerging industry, laser processing technology has developed rapidly and has gradually become a key technology in transforming traditional manufacturing. It has been widely used in various fields such as industrial production, communication technology, information processing, health care, military, and scientific research. The application and development of laser processing technology is restricted by thermal damage and the processing residues existing in traditional laser processing. However, water laser compound machining can better solve the above-mentioned problems. In water laser compound machining, heat and byproducts can be absorbed and taken away by water to improve processing quality. This paper expounds and analyzes the principles and research of three popular water laser compound machining methods (water-guided laser processing, underwater laser processing and water-jet-assisted laser processing). Furthermore, this paper analyzes the technical difficulties in water laser compound machining and looks forward to the future development trends of this technology.

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

Cited by 18 publications

References 7 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

Annular gas-assisted water jet guided laser manufacturing groove structure of Inconel 718 alloy

Research Progress of Water–Laser Compound Machining Technology

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