Abstract
Control of microstructural formation in direct metal deposition (DMD) presents a significant current limitation to the technology. Researchers have attempted to overcome this by thermal management in the process and through the formulation of new alloys. A novel material preparation method “satelliting” was used in combination with DMD to improve the microstructure of the deposited alloys. Three feedstocks of Ti-15Mo, including a satellited feedstock, a blend of Ti/Mo (150 μm) and blended Ti/Mo (3 μm), were prepared and used for DMD of Ti-15Mo. Fine equiaxed grains and near-equiaxed grains distributed uniformly were found in the deposited sample from satellited feedstock, while the samples from blended Ti/Mo (150 μm) and Ti/Mo (3 μm) are dominated by larger near-equiaxed grains and epitaxial columnar grains, respectively. The effect of the nucleation was verified by combinatory analysis of unmelted Mo particles. This demonstrates a new route to the manufacture of components through DMD which produces applicable microstructures directly from the build.
Original language | English |
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Pages (from-to) | 197-200 |
Number of pages | 4 |
Journal | Materials Letters |
Volume | 213 |
DOIs | |
State | Published - 15 Feb 2018 |
Keywords
- Direct metal deposition
- Microstructure
- Nucleation
- Satelliting
- Titanium alloy