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Strategies for Increasing the Productivity of Pulsed Laser Cladding of Hot-Crack Susceptible Nickel-Base Superalloy Inconel 738 LC

Production Technology Group, Technische Universität Ilmenau, Gustav-Kirchhoff-Platz 2, 98693 Ilmenau, Germany
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J. Manuf. Mater. Process. 2020, 4(3), 84; https://doi.org/10.3390/jmmp4030084
Received: 17 August 2020 / Revised: 27 August 2020 / Accepted: 28 August 2020 / Published: 29 August 2020
A novel repair strategy based on decoupled heat source for increasing the productivity of wire-assisted pulsed laser cladding of the γ’-precipitation strengthening nickel-base superalloys Inconel 738 low carbon (IN 738 LC, base material) and Haynes 282 (HS 282, filler material) is presented. The laser beam welding process is supported by the hot-wire technology. The additional energy is utilized to increase the deposition rate of the filler material by increasing feeding rates and well-defining the thermal management in the welding zone. The simultaneous application of laser pulse modulation allows the precise control of the temperature gradients to minimize the hot-crack formation. Accompanying investigations such as high-speed recordings and numerical simulations allow a generalized statement on the influence of the adapted heat management on the resulting weld seam geometry (dilution, aspect ratio and wetting angle) as well as the formation of hot-cracks and lack of fusion between base and filler material. Statistical analysis of the data—the input parameters like laser pulse energy, pulse shape, hot-wire power and wire-feeding rate in conjunction with the objectives like dilution, aspect ratio, wetting angle and hot-cracking behavior—revealed regression functions to predict certain weld seam properties and hence the required input parameters. View Full-Text
Keywords: nickel-base superalloy; repair welding; hot-wire; pulse shaping; heat management; statistical analysis; numerical simulation; hot-cracks nickel-base superalloy; repair welding; hot-wire; pulse shaping; heat management; statistical analysis; numerical simulation; hot-cracks
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Kästner, C.; Neugebauer, M.; Schricker, K.; Bergmann, J.P. Strategies for Increasing the Productivity of Pulsed Laser Cladding of Hot-Crack Susceptible Nickel-Base Superalloy Inconel 738 LC. J. Manuf. Mater. Process. 2020, 4, 84.

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