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Lasers in Manufacturing and Materials Processing

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11.07.2023 | Research

Laser Surface Remelting in Single-Crystal Nickel-based Superalloy using a Continuous Wave Fiber Laser

verfasst von: Srinivasa Rao Nandam, A. Venugopal Rao, Amol A. Gokhale, Suhas S. Joshi

Erschienen in: Lasers in Manufacturing and Materials Processing | Ausgabe 3/2023

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Abstract

Single-crystal (SC) nickel-based superalloy castings offer high-temperature microstructural stability and superior creep resistance, due to which they are exclusively used in the hot sections of gas turbine engines. However, SC nickel-base superalloy components are ‘difficult-to-cut’ while manufacturing. Worldwide research shows an interest in improving the machinability of superalloys. The present work investigates the controlled surface damage on CMSX-4 superalloy through laser surface remelting technique towards the improvement of their machinability. The specimens were laser-treated using a constant laser power and scan speed and by varying the positive focal position to get a range of energy densities. The process, structure, and property were systematically studied in the fusion zone (FZ). The FZ shape changes from keyhole to conduction mode with the increasing focal position. The FZ shows a finer assorted dendritic structure and lesser elemental segregation than the base metal (BM). In keyhole mode penetration, large pores, and multi-directional cracks were observed in the base region. On the other hand, the conductive mode showed only vertical centreline cracks and no significant porosity. The cracks are attributed to thermal stresses and elemental segregation produced during solidification. Microcracking was also observed near the fusion boundary and is attributed to the presence of low melting Mo and Ti–rich eutectics. The FZ away from the cracks showed 10% lower hardness than the BM, which is attributed to the dissolution of γ′ phase. Overall, the laser processing under the given range of energy densities produced wide variants of surface defects in the FZ.

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Titel: Laser Surface Remelting in Single-Crystal Nickel-based Superalloy using a Continuous Wave Fiber Laser
verfasst von: Srinivasa Rao Nandam
A. Venugopal Rao
Amol A. Gokhale
Suhas S. Joshi
Publikationsdatum: 11.07.2023
Verlag: Springer US
Erschienen in: Lasers in Manufacturing and Materials Processing / Ausgabe 3/2023
Print ISSN: 2196-7229
Elektronische ISSN: 2196-7237
DOI: https://doi.org/10.1007/s40516-023-00219-4

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