Optimization of processing parameters and microstructure evolution of (TiB+La2O3)/Ti6Al4V manufactured by laser melting deposition
Due to the intrinsically ultrahigh cooling rate and thermal gradient during laser melting deposition (LMD), columnar-to-equiaxed transition (CET) of grains has been a significant challenge in titanium-based alloys. In this study, two strategies, including the optimization of processing parameters an...
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| Format: | Article |
| Language: | English |
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Elsevier
2023-05-01
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| Series: | Journal of Materials Research and Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785423010232 |
| _version_ | 1797798714364919808 |
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| author | Yuyu Liu Wei Jiang Zheng Chen Quan Xu Zhiliang Zhang Jianying He |
| author_facet | Yuyu Liu Wei Jiang Zheng Chen Quan Xu Zhiliang Zhang Jianying He |
| author_sort | Yuyu Liu |
| collection | DOAJ |
| description | Due to the intrinsically ultrahigh cooling rate and thermal gradient during laser melting deposition (LMD), columnar-to-equiaxed transition (CET) of grains has been a significant challenge in titanium-based alloys. In this study, two strategies, including the optimization of processing parameters and the addition of ceramics particles, were utilized to promote the CET of Ti6Al4V. The optimal processing parameters of Ti6Al4V were confirmed by response surface methodology (RSM). The width of prior β grains effectively decreases under the minimum dilution of single track. Besides, different contents of TiB2 and La2O3 were added to Ti6Al4V powder and the in situ (TiB + La2O3)/Ti6Al4V composites were manufactured using the identified optimal processing parameters. In situ TiB whiskers segregating at the grain boundaries tailor the coarse columnar to equiaxed grains with La2O3 particles dispersed in the composites. With increasing formation of the reinforcements, equiaxed grain size decreases from 23.3 to 11.9 μm. The ultimate tensile strength of the components was improved by 19.6% and 26.4% compared to that of Ti6Al4V. This work provides systematic solutions to suppress the coarse columnar grains and refine the microstructure for titanium-based alloys. |
| first_indexed | 2024-03-13T04:07:59Z |
| format | Article |
| id | doaj.art-0da23a196caf41c0954b9ad2e1d930ff |
| institution | Directory Open Access Journal |
| issn | 2238-7854 |
| language | English |
| last_indexed | 2024-03-13T04:07:59Z |
| publishDate | 2023-05-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Materials Research and Technology |
| spelling | doaj.art-0da23a196caf41c0954b9ad2e1d930ff2023-06-21T06:57:35ZengElsevierJournal of Materials Research and Technology2238-78542023-05-012480868097Optimization of processing parameters and microstructure evolution of (TiB+La2O3)/Ti6Al4V manufactured by laser melting depositionYuyu Liu0Wei Jiang1Zheng Chen2Quan Xu3Zhiliang Zhang4Jianying He5School of Material Science and Engineering, China University of Mining and Technology, Xuzhou 221116, China; Department of Structural Engineering, Norwegian University of Science and Technology, Trondheim 7491, NorwaySchool of Material Science and Engineering, China University of Mining and Technology, Xuzhou 221116, ChinaSchool of Material Science and Engineering, China University of Mining and Technology, Xuzhou 221116, China; Corresponding author.School of Material Science and Engineering, China University of Mining and Technology, Xuzhou 221116, ChinaDepartment of Structural Engineering, Norwegian University of Science and Technology, Trondheim 7491, NorwayDepartment of Structural Engineering, Norwegian University of Science and Technology, Trondheim 7491, Norway; Corresponding author.Due to the intrinsically ultrahigh cooling rate and thermal gradient during laser melting deposition (LMD), columnar-to-equiaxed transition (CET) of grains has been a significant challenge in titanium-based alloys. In this study, two strategies, including the optimization of processing parameters and the addition of ceramics particles, were utilized to promote the CET of Ti6Al4V. The optimal processing parameters of Ti6Al4V were confirmed by response surface methodology (RSM). The width of prior β grains effectively decreases under the minimum dilution of single track. Besides, different contents of TiB2 and La2O3 were added to Ti6Al4V powder and the in situ (TiB + La2O3)/Ti6Al4V composites were manufactured using the identified optimal processing parameters. In situ TiB whiskers segregating at the grain boundaries tailor the coarse columnar to equiaxed grains with La2O3 particles dispersed in the composites. With increasing formation of the reinforcements, equiaxed grain size decreases from 23.3 to 11.9 μm. The ultimate tensile strength of the components was improved by 19.6% and 26.4% compared to that of Ti6Al4V. This work provides systematic solutions to suppress the coarse columnar grains and refine the microstructure for titanium-based alloys.http://www.sciencedirect.com/science/article/pii/S2238785423010232Laser melting depositionTitanium matrix compositesParameter optimizationMicrostructure evolutionFracture |
| spellingShingle | Yuyu Liu Wei Jiang Zheng Chen Quan Xu Zhiliang Zhang Jianying He Optimization of processing parameters and microstructure evolution of (TiB+La2O3)/Ti6Al4V manufactured by laser melting deposition Journal of Materials Research and Technology Laser melting deposition Titanium matrix composites Parameter optimization Microstructure evolution Fracture |
| title | Optimization of processing parameters and microstructure evolution of (TiB+La2O3)/Ti6Al4V manufactured by laser melting deposition |
| title_full | Optimization of processing parameters and microstructure evolution of (TiB+La2O3)/Ti6Al4V manufactured by laser melting deposition |
| title_fullStr | Optimization of processing parameters and microstructure evolution of (TiB+La2O3)/Ti6Al4V manufactured by laser melting deposition |
| title_full_unstemmed | Optimization of processing parameters and microstructure evolution of (TiB+La2O3)/Ti6Al4V manufactured by laser melting deposition |
| title_short | Optimization of processing parameters and microstructure evolution of (TiB+La2O3)/Ti6Al4V manufactured by laser melting deposition |
| title_sort | optimization of processing parameters and microstructure evolution of tib la2o3 ti6al4v manufactured by laser melting deposition |
| topic | Laser melting deposition Titanium matrix composites Parameter optimization Microstructure evolution Fracture |
| url | http://www.sciencedirect.com/science/article/pii/S2238785423010232 |
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