Abstract
The achievement of fine equiaxed β grain with conventional intragranular (α-Ti+β-Ti) microstructure in additive manufacturing titanium alloy remains a big challenge. We conquer this challenge by synergistically controlling β-grains during both solidification and subsequent thermal-cycles of laser directed energy deposition (DED), and a solution + quenching heat-treatment. Both the strength and plasticity of heat-treated Ti6Al4V3Ni0.05B are superior to those reported new DED titanium alloy and comparable to that of DED Ti6Al4V, because of the fine-equiaxed β-grains with intragranular (α-Ti+β-Ti) microstructure. These findings provide new insight into the grain structure control and the composition design of AM titanium alloy. IMPACT STATEMENT: The synergetic control of β-grain during both solidification and subsequent thermal-cycling is essential for achieving fully-equiaxed fine β-grains in additively manufactured titanium alloys.
| Original language | English |
|---|---|
| Pages (from-to) | 60-68 |
| Number of pages | 9 |
| Journal | Materials Research Letters |
| Volume | 11 |
| Issue number | 1 |
| DOIs | |
| State | Published - 2023 |
Keywords
- Additive manufacturing
- fully-equiaxed β-grains
- grain refinement
- microstructure
- titanium alloy