About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
|
Frontiers in Solidification: An MPMD Symposium Honoring Jonathan A. Dantzig
|
Presentation Title |
Nucleation Burst in Additively Manufactured Inconel 718 |
Author(s) |
Julien W. Zollinger, Ivan Cazic, Thomas Schenk, Michael Engstler, Benoît Appolaire |
On-Site Speaker (Planned) |
Julien W. Zollinger |
Abstract Scope |
The fine equiaxed microstructure observed in additively manufactured Inconel 718 is shown to form through an icosahedral short-range order (ISRO) mediated nucleation mechanism. By coupling 3D EBSD and HRTEM observation, the key role of titanium carbides (TiC) is demonstrated. TiC, if present in remelted previous layer, lead to a local enrichment in niobium, leading to the nucleation of numerous metastable phases containing icosahedral clusters, and leading to the observed grain refinement. The influence of local thermal conditions, of the shape and positions of TiC are discussed to provide new insights into the grain refinement of nickel alloys processed by additive manufacturing. |
Proceedings Inclusion? |
Planned: |
Keywords |
Solidification, Additive Manufacturing, Characterization |