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- Title
Underlying factors determining grain morphologies in high-strength titanium alloys processed by additive manufacturing.
- Authors
Nartu, Mohan S. K. K. Y.; Welk, Brian A.; Mantri, Srinivas A.; Taylor, Nevin L.; Viswanathan, Gopal B.; Dahotre, Narendra B.; Banerjee, Rajarshi; Fraser, Hamish L.
- Abstract
In recent research, additions of solute to Ti and some Ti-based alloys have been employed to produce equiaxed microstructures when processing these materials using additive manufacturing. The present study develops a computational scheme for guiding the selection of such alloying additions, and the minimum amounts required, to effect the columnar to equiaxed microstructural transition. We put forward two physical mechanisms that may produce this transition; the first and more commonly discussed is based on growth restriction factors, and the second on the increased freezing range effected by the alloying addition coupled with the imposed rapid cooling rates associated with AM techniques. We show in the research described here, involving a number of model binary as well as complex multi-component Ti alloys, and the use of two different AM approaches, that the latter mechanism is more reliable regarding prediction of the grain morphology resulting from given solute additions. Predictive scheme for Ti alloys with equiaxed microstructures is often limited by the methods based on growth restriction factors, Q. Here, the authors present a predictive solution based on the freezing range of alloys for columnar to equiaxed transition during fusion-based additive manufacturing.
- Subjects
MANUFACTURING processes; BINARY metallic systems; TITANIUM alloys; TITANIUM powder; ALLOYS; MORPHOLOGY
- Publication
Nature Communications, 2023, Vol 14, Issue 1, p1
- ISSN
2041-1723
- Publication type
Article
- DOI
10.1038/s41467-023-38885-9