Effect of powder characteristics on production of oxide dispersion strengthened Fe[sbnd]14Cr steel by laser powder bed fusion

E. Vasquez (1) , P.-F. Giroux (1) , F. Lomello (1) , M. Nussbaum (1) , H. Maskrot (1) , F. Schuster (1) , P. Castany (2)

1 CEA - Commissariat à l'énergie atomique et aux énergies alternatives
2 ISCR - Institut des Sciences Chimiques de Rennes

In order to assess the potentialities of additive manufacturing in nuclear industry, Oxide Dispersion Strengthened (ODS) Fe[sbnd]14Cr steels are produced by laser powder bed fusion (L-PBF). Such materials are currently manufactured by milling a Fe[sbnd]14Cr atomized powder with Y2O3 and TiH2 powders. The resulting powder has a non-spherical shape being coarser than powders typically used in L-PBF equipment. The influence of powder characteristics on the processability of ODS Fe[sbnd]14Cr by L-PBF are studied in details. Four different powders are used. These powders differ from size, morphology and chemical composition. Finer is the powder; wider is the process range to obtain dense samples. This phenomenon could be mitigated by transferring an amount of energy superior to 110 J.mm−3. The presence of yttrium and titanium gives columnar microstructure for ODS samples, whereas Fe[sbnd]14Cr samples have stirred microstructure. Titanium and yttrium form oxides, which enlarge the melt pool and induce columnar growth. © 2019 Elsevier B.V.

Mots clés: Powder flowability; Particle size distribution; Additive manufacturing; Laser Powder Bed Fusion (L-PBF); Metal Matrix Composites (MMCs); Chemical composition

Domaines: Chimie

E. Vasquez, P.-F. Giroux, F. Lomello, M. Nussbaum, H. Maskrot, et al.. Effect of powder characteristics on production of oxide dispersion strengthened Fe[sbnd]14Cr steel by laser powder bed fusion. Powder Technology, 2020, 360, pp.998-1005. ⟨10.1016/j.powtec.2019.11.022⟩. ⟨hal-02443574⟩