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Surface Morphology of Nimonic Alloy 263™ in Nanosecond Pulsed Laser Ablation

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Advanced Engineering of Materials Through Lasers


Nimonic Alloy 263™ is a class of nickel-based superalloy with extraordinary properties used in the rigorous executing conditions in gas turbines for its superior mechanical strength and outstanding rust resistance ability. Laser beam machining (LBM) is one of the developed non-contact techniques used in fine manufacturing, especially in fabricating advanced metallic materials like nickel-based superalloy. Pulsed laser ablation (PLA) is an air ambient laser micromachining technique that has been proved as a sufficient solution in micro-scale machining precisely. Popular methods like Q-switched ns pulsed laser and ultrashort pulsed UV laser respectively exist significant shortcomings in restricted power density output and high operating cost. This article concentrates on using a newly developed Master Oscillator Power Amplifier (MOPA) ns fibre laser ablation of 2 mm thickness Nimonic Alloy 263™ substrate in dry air ambient. Laser-induced plasma cloud was found at power density saturated point 8.1 × 105 kW/cm2, which significantly discounted the efficiency of laser irradiance substrate penetration. Through the parametric study of process parameters, pulse duration of 46 ns with frequency 105 kHz were filtered out in the optimum ablation performance in depth and surface quality at power density 8.1 × 105 kW/cm2. The exponential function relationship was found between scanning speed and ablation depth or surface roughness. An increase in scanning speed resulted in higher ablation depth, whereas sacrifices surface finish to some extent.

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Chirped Pulse Amplification


Direct laser writing


Electrical Discharge Machining


Full width Half Maximum


Heat Affected Zone


Laser Beam Machining


Laser Induced Plasma


Master Oscillator Power Amplifier


Material Removal Rate


Neodymium-doped Yttrium Aluminium Garnet


Pulse Laser Ablation


Scanning Electron Microscope


Ytterbium-doped Yttrium Aluminium Garnet


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Correspondence to J. Radhakrishnan .

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Jiang, Z., Pathak, S., Subramani, S., Radhakrishnan, J., Marimuthu, S. (2022). Surface Morphology of Nimonic Alloy 263™ in Nanosecond Pulsed Laser Ablation. In: Radhakrishnan, J., Pathak, S. (eds) Advanced Engineering of Materials Through Lasers. Advances in Material Research and Technology. Springer, Cham.

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