Compositional criteria to predict columnar to equiaxed transitions in metal additive manufacturing
Abstract Predicting the columnar to equiaxed transition (CET) and grain refinement for additively manufactured alloys from thermodynamic databases has been a long-standing challenge and an ongoing source of discussion. Efforts are focused on designing alloy compositions to achieve fully equiaxed mic...
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| Format: | Article |
| Language: | English |
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Nature Portfolio
2025-07-01
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| Series: | Nature Communications |
| Online Access: | https://doi.org/10.1038/s41467-025-60162-0 |
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| author | Ryan Brooke Duyao Zhang Dong Qiu Mark A. Gibson Mark Easton |
| author_facet | Ryan Brooke Duyao Zhang Dong Qiu Mark A. Gibson Mark Easton |
| author_sort | Ryan Brooke |
| collection | DOAJ |
| description | Abstract Predicting the columnar to equiaxed transition (CET) and grain refinement for additively manufactured alloys from thermodynamic databases has been a long-standing challenge and an ongoing source of discussion. Efforts are focused on designing alloy compositions to achieve fully equiaxed microstructures, thereby eliminating the mechanical anisotropy commonly associated with the large columnar grains in additively manufactured alloys. Here, three compositional parameters proposed in the literature are evaluated across a range of Ti alloys: the non-equilibrium solidification range (ΔT s ), the growth restriction factor (Q) and constitutional supercooling parameter (P). Ti-Fe, Ti-Cu, Ti-Cu-Fe, and Ti-Mo alloys produced via direct energy deposition experimentally verified that P is the most reliable parameter to guide the selection of alloying elements for additively manufactured (AM) alloys. Verification was found by reconsidering results from additional alloy systems and AM methods. The numerical CET models also predict that P is closely related to dendrite tip undercooling at high growth velocities, as found in AM. This work provides a clearer framework for predicting the grain morphology of metallic alloys in AM. |
| format | Article |
| id | doaj-art-63d03e1f0d744d02a019324a0b794959 |
| institution | Kabale University |
| issn | 2041-1723 |
| language | English |
| publishDate | 2025-07-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Nature Communications |
| spelling | doaj-art-63d03e1f0d744d02a019324a0b7949592025-08-20T03:45:34ZengNature PortfolioNature Communications2041-17232025-07-0116111110.1038/s41467-025-60162-0Compositional criteria to predict columnar to equiaxed transitions in metal additive manufacturingRyan Brooke0Duyao Zhang1Dong Qiu2Mark A. Gibson3Mark Easton4School of Engineering, Centre for Additive Manufacturing, RMIT UniversitySchool of Engineering, Centre for Additive Manufacturing, RMIT UniversitySchool of Engineering, Centre for Additive Manufacturing, RMIT UniversitySchool of Engineering, Centre for Additive Manufacturing, RMIT UniversitySchool of Engineering, Centre for Additive Manufacturing, RMIT UniversityAbstract Predicting the columnar to equiaxed transition (CET) and grain refinement for additively manufactured alloys from thermodynamic databases has been a long-standing challenge and an ongoing source of discussion. Efforts are focused on designing alloy compositions to achieve fully equiaxed microstructures, thereby eliminating the mechanical anisotropy commonly associated with the large columnar grains in additively manufactured alloys. Here, three compositional parameters proposed in the literature are evaluated across a range of Ti alloys: the non-equilibrium solidification range (ΔT s ), the growth restriction factor (Q) and constitutional supercooling parameter (P). Ti-Fe, Ti-Cu, Ti-Cu-Fe, and Ti-Mo alloys produced via direct energy deposition experimentally verified that P is the most reliable parameter to guide the selection of alloying elements for additively manufactured (AM) alloys. Verification was found by reconsidering results from additional alloy systems and AM methods. The numerical CET models also predict that P is closely related to dendrite tip undercooling at high growth velocities, as found in AM. This work provides a clearer framework for predicting the grain morphology of metallic alloys in AM.https://doi.org/10.1038/s41467-025-60162-0 |
| spellingShingle | Ryan Brooke Duyao Zhang Dong Qiu Mark A. Gibson Mark Easton Compositional criteria to predict columnar to equiaxed transitions in metal additive manufacturing Nature Communications |
| title | Compositional criteria to predict columnar to equiaxed transitions in metal additive manufacturing |
| title_full | Compositional criteria to predict columnar to equiaxed transitions in metal additive manufacturing |
| title_fullStr | Compositional criteria to predict columnar to equiaxed transitions in metal additive manufacturing |
| title_full_unstemmed | Compositional criteria to predict columnar to equiaxed transitions in metal additive manufacturing |
| title_short | Compositional criteria to predict columnar to equiaxed transitions in metal additive manufacturing |
| title_sort | compositional criteria to predict columnar to equiaxed transitions in metal additive manufacturing |
| url | https://doi.org/10.1038/s41467-025-60162-0 |
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