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Erschienen in: Progress in Additive Manufacturing 3/2021

26.06.2021 | Full Research Article

Microstructure characterization of WC-9.2wt%Monel 400 fabricated using laser engineered net shaping

verfasst von: Brandon Davoren, Natasha Sacks, Maritha Theron

Erschienen in: Progress in Additive Manufacturing | Ausgabe 3/2021

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Abstract

To assess if a WC-9.2wt%Monel 400 alloy properties could be improved using LENS, one alloy was deposited onto a heated substrate and a second alloy was subjected to laser remelting of the final deposited layer. Microstructural characterization was performed using XRD, FESEM, EPMA, and Raman spectroscopy. Multiple microstructures were observed with eutectic, fishbone, and Fe/W-rich dendrites present in the fusion zone at the substrate-alloy interface, while needle-like, triangular and blocky carbides were found in the central regions, with acicular microstructures in the surface region. The alloy deposited onto the heated substrate had less eutectic and more fishbone structures in the fusion region. The laser remelted surface layer had a more homogenous acicular structure with minimal binder pooling compared to the other alloys. The spheroidal, cast WC/W2C powder particles were found to have core-rim structures after laser sintering. These microstructural variations resulted in a gradient hardness profile from the substrate-alloy interface to the alloy surface. The surface hardness of the laser remelted alloy was found to be significantly higher compared to the other alloys.

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Metadaten
Titel
Microstructure characterization of WC-9.2wt%Monel 400 fabricated using laser engineered net shaping
verfasst von
Brandon Davoren
Natasha Sacks
Maritha Theron
Publikationsdatum
26.06.2021
Verlag
Springer International Publishing
Erschienen in
Progress in Additive Manufacturing / Ausgabe 3/2021
Print ISSN: 2363-9512
Elektronische ISSN: 2363-9520
DOI
https://doi.org/10.1007/s40964-021-00203-4

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