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Non-oxide precipitates in additively manufactured austenitic stainless steel

Abstract : Precipitates in an austenitic stainless steel fabricated via any Additive Manufacturing (AM), or 3D printing, technique have been widely reported to be only Mn-Si-rich oxides. However, via Transmission Electron Microscopy (TEM) studies on a 316L stainless steel, we show that non-oxide precipitates (intermetallics, sulfides, phosphides and carbides) can also form when the steel is fabricated via Laser Metal Deposition (LMD)-a directed energy deposition-type AM technique. An investigation into their origin is conducted with support from precipitation kinetics and finite element heat transfer simulations. It reveals that non-oxide precipitates form during solidification/cooling at temperatures ≥ 0.75Tm (melting point) and temperature rates ≤ 10 5 K/s, which is the upper end of the maximum rates encountered during LMD but lower than those encountered during Selective Laser Melting (SLM)-a powder-bed type AM technique. Consequently, non-oxide precipitates should form during LMD, as reported in this work, but not during SLM, in consistency with existing literature.
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https://hal-polytechnique.archives-ouvertes.fr/hal-03221432
Contributor : Manas V. Upadhyay <>
Submitted on : Saturday, May 8, 2021 - 4:18:17 PM
Last modification on : Monday, May 17, 2021 - 12:39:12 PM
Long-term archiving on: : Monday, August 9, 2021 - 6:13:52 PM

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Manas Vijay Upadhyay, Meriem Ben Haj Slama, Steve Gaudez, Nikhil Mohanan, Lluis Yedra, et al.. Non-oxide precipitates in additively manufactured austenitic stainless steel. Scientific Reports, Nature Publishing Group, inPress, ⟨10.1038/s41598-021-89873-2⟩. ⟨hal-03221432⟩

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