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Article Dans Une Revue Powder Technology Année : 2022

Soft chemistry synthesis and laser powder bed fusion processing of Fe–Ni alloy based powders

Résumé

Fe-Ni alloy based powders of different stoichiometry and purity were synthesized by thermal decomposition of a co-precipitated oxalic precursor. By modifying the oxygen partial pressure of the gaseous flow, a nearly pure Fe 64 Ni 36 Invar powder and a composite Fe 50 Ni 50-Fe 3 O 4 powder were prepared. The composite particles present an original microstructure consisting of an intimate mixture of Fe 50 Ni 50 and Fe 3 O 4 submicronic grains. The behavior of the composite powder was studied in laser powder bed fusion (LPBF) process. Reduction of iron oxide and specific microstructural changes were revealed. Subsequent conventional heat post-treatment allowed to remove the remaining iron oxides and to form porous multiphase Fe-Ni alloy 3D parts. Repeatable heterogeneities of microstructure and composition, at a periodicity corresponding to the thickness of the powder bed used in the LPBF process, constitute the hallmark of the laser treatment carried out on the composite powder.
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Dates et versions

hal-03819805 , version 1 (19-10-2022)

Identifiants

Citer

Valérie Baco-Carles, Vincent Baylac, Isabelle Pasquet, Baptiste Plissonneau, Philippe Tailhades. Soft chemistry synthesis and laser powder bed fusion processing of Fe–Ni alloy based powders: A route for the manufacturing of porous multiphase Fe–Ni alloy parts. Powder Technology, 2022, 399, pp.117200. ⟨10.1016/j.powtec.2022.117200⟩. ⟨hal-03819805⟩
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