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Microstructural Characteristics of Graded Ni-Fe Coatings Fabricated Through DED-L

  • Directed Energy Deposition-Laser (DED-L) enables high-performance coatings through melting and successive powder deposition. Its compositional flexibility suits functionally graded layers that enhance corrosion and wear resistance. This study aimed to improve parameters for producing dense, defect-free, graded Ni- and Fe-based coatings by varying the scanning speed and deposition strategy (monodirectional versus bidirectional, with/without layer rotation), while keeping the power and hatch distance constant. Laser and electron microscopy were used to link parameters to porosity and uniformity. Optimal settings minimized pores, improved interlayer bonding and preserved geometry; inadequate parameters yielded porous, irregular deposits. A bidirectional path with 90° rotation appeared best. Ongoing research activities are needed to assess its properties. Highlights What are the main findings? - Bidirectional samples show fewer pores than samples with monodirectional movement. - Increasing the scanning speed leads to lower porosity (bidirectional scanning mode with 90° layer rotation). - Bidirectional deposition with 90° layer rotation exhibits best quality What are the implications of the main findings? - Systematic study of scanning speed and deposition strategy. - Practical guidance for process improvement of graded metal coatings; properties under evaluation. - Functionally graded Ni-Fe coatings fabricated by DED-L with tailored microstructures.

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Metadaten
Author:Marco BrandORCiD, Ion-Dragos UtuORCiD, Nicusor-Alin SirbuORCiD, Ion-Aurel PerianuORCiD, Denis Andrei PreduORCiD, Gabriela MargineanORCiD
URN:urn:nbn:de:hbz:1010-opus4-49138
DOI:https://doi.org/10.3390/ma19020271
ISSN:1996-1944
Parent Title (English):Materials (Special Issue Advanced Coating Research for Metal Surface Protection)
Publisher:MDPI
Document Type:Article
Language:English
Date of Publication (online):2026/01/09
Year of first Publication:2026
Publishing Institution:Westfälische Hochschule Gelsenkirchen Bocholt Recklinghausen
Release Date:2026/01/09
Tag:deposition strategy; directed energy deposition-laser; functionally graded materials; parameter study; powder processing; surface protection
Volume:2026
Issue:19 (2)
Article Number:271
Page Number:18
Institutes:Fachbereiche / Elektrotechnik und angewandte Naturwissenschaften
Licence (German):Creative Commons - Namensnennung
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