Microstructure and corrosion resistance of Ni-Cu alloy fabricated through wire arc additive manufacturing

•Multilayer wall of Monel FM60 was successfully produced with WAAM technology.•The microstructure was mainly dendritic with minor amount of Cu segregation.•The lower depletion of strengthening elements enhanced the pitting resistance.•Corrosion results of WAAM processed Monel FM60 was outstanding (0...

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Bibliographic Details
Published in:Materials letters 2022-02, Vol.308, p.131262, Article 131262
Main Authors: Kannan, A. Rajesh, Kumar, S. Mohan, Pramod, R., Shanmugam, N. Siva, Vishnukumar, M., Channabasavanna, S.G.
Format: Article
Language:English
Subjects:
Additive manufacturing
Copper
Corrosion
Corrosion resistance
Dendritic structure
Energy dispersive X ray analysis
Manufacturing
Marine technology
Materials science
Microstructure
Monel (trademark)
Multilayers
Ni-Cu alloy
Nickel base alloys
Photomicrographs
Titanium
Welding
Wire
Wire arc additive manufacturing
X ray analysis
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Summary:•Multilayer wall of Monel FM60 was successfully produced with WAAM technology.•The microstructure was mainly dendritic with minor amount of Cu segregation.•The lower depletion of strengthening elements enhanced the pitting resistance.•Corrosion results of WAAM processed Monel FM60 was outstanding (0.010–0.015 mpy). Wire arc additive manufacturing (WAAM) technology is a promising low-cost process for fabricating or restoring marine structures with Ni-Cu alloy. In this work, single pass multi-layer wall of Monel FM60 was deposited with WAAM process. The micrographs revealed the presence of equiaxed and elongated columnar dendrites with minor amount of Cu segregation in Ni-Cu matrix. Due to the complex cyclic thermal history, the microstructure varied along the building direction (BD) and the secondary dendrite arm spacing (SDAS) ranged between 5 and 15 µm. Energy Dispersive X-Ray Analysis (EDS) results confirmed the existence of tiny Ti-rich particles within the Ni-Cu matrix. The WAAM processed Monel FM60 specimens (0.40–0.62 mpy) exhibited better corrosion resistance compared to traditional Monel 400 alloy (0.57–0.67 mpy) in 3.5% NaCl solution. The enhanced corrosion resistance is corroborated to the retaining of strengthening elements in WAAM specimens and the pit size ranged between 40 and 80 µm.
ISSN:0167-577X
1873-4979
DOI:10.1016/j.matlet.2021.131262