Microstructural modification of additively manufactured metals by electropulsing

Noell, Philip J.; Rodelas, Jeffrey M.; Ghanbari, Zahra N.; Laursen, Chris M.

doi:10.1016/j.addma.2020.101128

Microstructural modification of additively manufactured metals by electropulsing

Journal Article · Tue Feb 11 23:00:00 EST 2020 · Additive Manufacturing

DOI:https://doi.org/10.1016/j.addma.2020.101128· OSTI ID:1617299

Noell, Philip J. ^[1]; Rodelas, Jeffrey M. ^[1]; Ghanbari, Zahra N. ^[1]; Laursen, Chris M. ^[1]

Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

Additive manufacturing (AM) promises rapid development cycles and fabrication of ready-to-use, geometrically-complex parts. The metallic parts produced by AM often contain highly non-equilibrium microstructures, e.g. chemical microsegregation and residual dislocation networks. While such microstructures can enhance some material properties, they are often undesirable. Many AM parts are thus heat-treated after fabrication, a process that significantly slows production. This study investigated if electropulsing, the process of sending high-current-density electrical pulses through a metallic part, could be used to modify the microstructures of AM 316 L stainless steel (SS) and AlSi10Mg parts fabricated by selective laser melting (SLM) more rapidly than thermal annealing. Electropulsing has shown promise as a rapid postprocessing method for materials fabricated using conventional methods, e.g. casting and rolling, but has never been applied to AM materials. For both the materials used in this study, as-fabricated SLM parts contained significant chemical heterogeneity, either chemical microsegregation (316 L SS) or a cellular interdendritic phase (AlSi10Mg). In both cases, annealing times on the order of hours at high homologous temperatures are necessary for homogenization. Using electropulsing, chemical microsegregation was eliminated in 316 L SS samples after 10, 16 ms electrical pulses. In AlSi10Mg parts, electropulsing produced spheroidized Si-rich particles after as few as 15, 16 ms electrical pulses with a corresponding increase in ductility. Finally, this study demonstrated that electropulsing can be used to modify the microstructures of AM metals.

View Accepted Manuscript (DOE)

Research Organization:: Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC04-94AL85000; NA0003525

OSTI ID:: 1617299

Alternate ID(s):: OSTI ID: 1768116

Report Number(s):: SAND--2019-14609J; 682505

Journal Information:: Additive Manufacturing, Journal Name: Additive Manufacturing Journal Issue: C Vol. 33; ISSN 2214-8604

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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