Journal
JOURNAL OF MATERIALS SCIENCE
Volume 55, Issue 27, Pages 13342-13350Publisher
SPRINGER
DOI: 10.1007/s10853-020-04915-w
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Funding
- AUSMURI program, Department of Industry, Innovation and Science, Australia
- Australian Research Council's DECRA [DE180100440]
- UNSW Scientia Fellowship schemes
- ONR [N00014-18-1-2794]
- U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy, Advanced Manufacturing Office [DE-AC05-00OR22725]
- UT-Battelle, LLC
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Additive manufacturing is a promising alternative method for fabricating components of Ni-based superalloys which are difficult to cast, form and join. However, typical thermal cycles associated with laser powder bed-fusion techniques suppress the formation of desirable microstructures containing gamma ' particles, necessitating long-time post-process heat treatments. Here we report in-situ precipitation of gamma ' (L1(2)-ordered) particles and carbides during electron-beam powder bed-fusion of Inconel-738. The gamma ' particles are homogenously distributed across the build and exhibit amultimodalsize distribution. Based on atom-probe microscopy, we propose a eutectic reaction and multiple nucleation, growth, coarsening and dissolution bursts during thermal cycling as formation mechanism.
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