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Grain Structure Evolution in Fe-6Si During Directed Energy Deposition.
- Source :
- JOM: The Journal of The Minerals, Metals & Materials Society (TMS); Mar2024, Vol. 76 Issue 3, p1031-1043, 13p
- Publication Year :
- 2024
-
Abstract
- The purpose of this study is to explore the effect of additive manufacturing (AM) process variables on the grain structure of Fe-6Si, a soft-magnetic alloy used in electrical machine and grid applications. Samples were fabricated with laser engineered net shaping (LENS) with varying inter-pass timing and numbers of unidirectional passes. The results show that the grain structure was affected by both solidification and solid-state grain growth mechanisms. A model of the LENS process suggests that, although shorter inter-pass times encourage greater nucleation of new grains and therefore grain refinement during solidification, these conditions also help maintain high solid-state temperatures that allow for grain boundary motion to keep pace with the build rate. Grains formed under these conditions may span multiple layers, and the high-temperature gradient promotes directional growth. This new understanding of these microstructure evolution mechanisms will aid in using process conditions to control the competition between solidification and solid-state grain growth to create grain structures that may not be possible with conventional processing. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 10474838
- Volume :
- 76
- Issue :
- 3
- Database :
- Complementary Index
- Journal :
- JOM: The Journal of The Minerals, Metals & Materials Society (TMS)
- Publication Type :
- Academic Journal
- Accession number :
- 175459648
- Full Text :
- https://doi.org/10.1007/s11837-023-06279-3