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- Title
Role of Elemental Segregation on the Oxidation Behavior of Additively Manufactured Alloy 625.
- Authors
de Leon Nope, G.; Wang, G.; Alvarado-Orozco, J. M.; Gleeson, B.
- Abstract
This study presents the microstructure and oxidation behavior at 800°C in the air of Alloy 625 manufactured by conventional manufacturing and laser-assisted additive manufacturing (AM) processes: powder bed fusion and direct energy deposition (DED). The microstructures of the AM samples were cellular-dendritic, with interdendritic segregation of Nb and Mo. The DED samples have higher segregation and coarser cellular-dendritic structures than the LPBF sample. The AM samples had slightly higher oxidation rates than the wrought sample, even though all samples formed a chromia scale. The oxidized samples also formed a discontinuous δ-phase beneath the chromia scale, where the Nb segregation promoted a higher δ-phase fraction. The δ-phase did not affect chromium consumption during oxidation, but an excessive amount of δ-phase became embedded in the chromia, which apparently promoted scale decohesion.
- Subjects
OXIDATION; ALLOYS; CHROMIUM; MICROSTRUCTURE; POWDERS; TITANIUM powder
- Publication
JOM: The Journal of The Minerals, Metals & Materials Society (TMS), 2022, Vol 74, Issue 4, p1698
- ISSN
1047-4838
- Publication type
Article
- DOI
10.1007/s11837-022-05200-8