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<p>This study investigates the mechanical properties and optimal process parameters to determine the single-objective performance characteristics of ytterbium fiber laser-welded Inconel 718, a nickel-based alloy, using the central composite design method. Inconel 718 (UNS N07718, W Nr 2.4668) is an austenitic nickel-based superalloy known for its excellent tensile strength and creep rupture properties. This superalloy plays a crucial role in aerospace turbine blades, particularly in critical rotating components. Modern aircraft also widely use it for aerofoils, supporting structures, and pressure vessels. Fiber laser welding is a well-established solid-state laser welding technique recognized for its narrow fusion zone, high intensity, and minimal thermal distortion. To optimize the input process parameters, including laser power (W), duty cycle (%), welding speed (mm/min), and frequency (Hz)—for the single-output response of ultimate tensile strength (MPa), the central composite design from response surface methodology (four factors at three levels) is employed. Analysis of variance (ANOVA) is used to identify the most influential process parameter. The weld zone exhibited high hardness across all experiments. An empirical relationship for ultimate tensile strength is established, and the optimized condition resulted in an ultimate tensile strength that is 4.7% higher than the base metal. Scanning electron microscope and x-ray diffraction tests show the details of the microstructure and the distribution of elements in the weld area.</p>

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Metallurgical and Mechanical Characterization of Optimized Ytterbium Fiber Laser-Welded Inconel 718 Similar Joints

  • 期刊论文

  • 发表日期：

    2025年8月19日

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  • Sankarasubramanian Seenivasan,
  • Raju Varahamoorthi

摘要

This study investigates the mechanical properties and optimal process parameters to determine the single-objective performance characteristics of ytterbium fiber laser-welded Inconel 718, a nickel-based alloy, using the central composite design method. Inconel 718 (UNS N07718, W Nr 2.4668) is an austenitic nickel-based superalloy known for its excellent tensile strength and creep rupture properties. This superalloy plays a crucial role in aerospace turbine blades, particularly in critical rotating components. Modern aircraft also widely use it for aerofoils, supporting structures, and pressure vessels. Fiber laser welding is a well-established solid-state laser welding technique recognized for its narrow fusion zone, high intensity, and minimal thermal distortion. To optimize the input process parameters, including laser power (W), duty cycle (%), welding speed (mm/min), and frequency (Hz)—for the single-output response of ultimate tensile strength (MPa), the central composite design from response surface methodology (four factors at three levels) is employed. Analysis of variance (ANOVA) is used to identify the most influential process parameter. The weld zone exhibited high hardness across all experiments. An empirical relationship for ultimate tensile strength is established, and the optimized condition resulted in an ultimate tensile strength that is 4.7% higher than the base metal. Scanning electron microscope and x-ray diffraction tests show the details of the microstructure and the distribution of elements in the weld area.