Recycling Of Spent Powders From Laser Powder Bed Fusion Processing Of Inconel 625 For The Mechanical Synthesis Of Cocrfenimoxnb0.4x (X=0-0.1) Multi-Principal Element Alloys (Mpeas)

Authors:

Elena Colombini (1); Magdalena Lassinantti Gualtieri (1); Simone Paggetti (1); Paolo Veronesi (1)

1- Department of Engineering “Enzo Ferrari”, University of Modena and Reggio Emilia, Via P. Vivarelli 10/1 – 41125 Modena, Italy

Abstract:

Laser powder bed fusion processing (L-PBF) is an emerging additive manufacturing (AM) technique particularly suitable for the production of parts with complex shapes made of materials with low machinability, such as Ni-based superalloys. Although most of the excess powder following each building cycle can be recycled in successive ones, some solid scrap consisting of large particle aggregates are sieved out from the recycled powder stream and disposed of as hazardous waste. An interesting alternative is recycling for the synthesis of products with high added value such as Multi-Principal Element Alloys (MPEAs). This is explored here for the mechanical synthesis of equimolar CoCrFeNi fcc-structured MPEA doped with 4d transition metals (CoCrFeNiMoxNb0.4x with x=0-0.1) originating from spent powders of Inconel 625. Results from microstructural characterizations and nanoindentation analyses of the powders highlight the feasibility of using spent powders for the mechanical synthesis of fcc MPEAs.

DOI:

https://doi.org/10.59499/EP235765330