Columnar to equiaxed transition during β heat treatment in a near β alloy by laser additive manufacture
Columnar β grains are widely present in titanium alloys fabricated by Additive Manufacturing (AM), which leads to significant anisotropy in mechanical properties. An outstanding challenge is to facilitate the columnar to equiaxed transition (CET) of the prior β grains. In this research, CET and the...
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| Format: | Article |
| Language: | English |
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Elsevier
2021-07-01
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| Series: | Journal of Materials Research and Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S223878542100497X |
| _version_ | 1818640518044712960 |
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| author | Min Qi Sensen Huang Yingjie Ma Sabry S. Youssef Ruixue Zhang Jianke Qiu Jiafeng Lei Rui Yang |
| author_facet | Min Qi Sensen Huang Yingjie Ma Sabry S. Youssef Ruixue Zhang Jianke Qiu Jiafeng Lei Rui Yang |
| author_sort | Min Qi |
| collection | DOAJ |
| description | Columnar β grains are widely present in titanium alloys fabricated by Additive Manufacturing (AM), which leads to significant anisotropy in mechanical properties. An outstanding challenge is to facilitate the columnar to equiaxed transition (CET) of the prior β grains. In this research, CET and the underlying grain growth mechanism during β heat treatment in Ti–5Al–5Mo–5V–1Cr–1Fe (Ti55511) alloy manufactured by selected laser melting (SLM) and laser metal deposition (LMD) were investigated. For the first time, the quasi-in-situ observation was employed in the AM near β titanium alloys by the electron backscatter diffraction technique to analyze morphology, crystal orientation and substructure evolution, especially in the situation of bamboo-like microstructure with columnar grains and equiaxed grains distributed layer by layer. It was found that the prior β grains enriched low-angle grain boundaries (LAGB) are in a high stored strain energy state in as-deposited SLM Ti55511 leading to a recrystallized nucleation-and-growth process during heat treatment, while the prior β grains containing a small amount or even no LAGB are in a relatively lower stored strain energy state in as-deposited LMD Ti55511 resulting in recrystallization and grain growth processes. |
| first_indexed | 2024-12-16T23:12:32Z |
| format | Article |
| id | doaj.art-71c858834335477f919d6a2c5e875b7b |
| institution | Directory Open Access Journal |
| issn | 2238-7854 |
| language | English |
| last_indexed | 2024-12-16T23:12:32Z |
| publishDate | 2021-07-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Materials Research and Technology |
| spelling | doaj.art-71c858834335477f919d6a2c5e875b7b2022-12-21T22:12:24ZengElsevierJournal of Materials Research and Technology2238-78542021-07-011311591168Columnar to equiaxed transition during β heat treatment in a near β alloy by laser additive manufactureMin Qi0Sensen Huang1Yingjie Ma2Sabry S. Youssef3Ruixue Zhang4Jianke Qiu5Jiafeng Lei6Rui Yang7School of Materials Science and Engineering, University of Science and Technology of China, Shenyang, 110016, China; Shi-changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, ChinaShi-changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China; Innovation Group of Marine Engineering Materials and Corrosion Control, Southern Marine Science and Engineering Guangdong Laboratory, Zhuhai, 519080, ChinaSchool of Materials Science and Engineering, University of Science and Technology of China, Shenyang, 110016, China; Shi-changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China; Innovation Group of Marine Engineering Materials and Corrosion Control, Southern Marine Science and Engineering Guangdong Laboratory, Zhuhai, 519080, China; Corresponding author.School of Materials Science and Engineering, University of Science and Technology of China, Shenyang, 110016, China; Shi-changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, ChinaSchool of Materials Science and Engineering, Northeastern University, Shenyang, 110819, ChinaSchool of Materials Science and Engineering, University of Science and Technology of China, Shenyang, 110016, China; Shi-changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China; Innovation Group of Marine Engineering Materials and Corrosion Control, Southern Marine Science and Engineering Guangdong Laboratory, Zhuhai, 519080, ChinaSchool of Materials Science and Engineering, University of Science and Technology of China, Shenyang, 110016, China; Shi-changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China; Innovation Group of Marine Engineering Materials and Corrosion Control, Southern Marine Science and Engineering Guangdong Laboratory, Zhuhai, 519080, China; Corresponding author.School of Materials Science and Engineering, University of Science and Technology of China, Shenyang, 110016, China; Shi-changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China; Innovation Group of Marine Engineering Materials and Corrosion Control, Southern Marine Science and Engineering Guangdong Laboratory, Zhuhai, 519080, ChinaColumnar β grains are widely present in titanium alloys fabricated by Additive Manufacturing (AM), which leads to significant anisotropy in mechanical properties. An outstanding challenge is to facilitate the columnar to equiaxed transition (CET) of the prior β grains. In this research, CET and the underlying grain growth mechanism during β heat treatment in Ti–5Al–5Mo–5V–1Cr–1Fe (Ti55511) alloy manufactured by selected laser melting (SLM) and laser metal deposition (LMD) were investigated. For the first time, the quasi-in-situ observation was employed in the AM near β titanium alloys by the electron backscatter diffraction technique to analyze morphology, crystal orientation and substructure evolution, especially in the situation of bamboo-like microstructure with columnar grains and equiaxed grains distributed layer by layer. It was found that the prior β grains enriched low-angle grain boundaries (LAGB) are in a high stored strain energy state in as-deposited SLM Ti55511 leading to a recrystallized nucleation-and-growth process during heat treatment, while the prior β grains containing a small amount or even no LAGB are in a relatively lower stored strain energy state in as-deposited LMD Ti55511 resulting in recrystallization and grain growth processes.http://www.sciencedirect.com/science/article/pii/S223878542100497XTitanium alloySelective laser meltingLaser metal depositionPost heat-treatmentRecrystallizationGrain growth |
| spellingShingle | Min Qi Sensen Huang Yingjie Ma Sabry S. Youssef Ruixue Zhang Jianke Qiu Jiafeng Lei Rui Yang Columnar to equiaxed transition during β heat treatment in a near β alloy by laser additive manufacture Journal of Materials Research and Technology Titanium alloy Selective laser melting Laser metal deposition Post heat-treatment Recrystallization Grain growth |
| title | Columnar to equiaxed transition during β heat treatment in a near β alloy by laser additive manufacture |
| title_full | Columnar to equiaxed transition during β heat treatment in a near β alloy by laser additive manufacture |
| title_fullStr | Columnar to equiaxed transition during β heat treatment in a near β alloy by laser additive manufacture |
| title_full_unstemmed | Columnar to equiaxed transition during β heat treatment in a near β alloy by laser additive manufacture |
| title_short | Columnar to equiaxed transition during β heat treatment in a near β alloy by laser additive manufacture |
| title_sort | columnar to equiaxed transition during β heat treatment in a near β alloy by laser additive manufacture |
| topic | Titanium alloy Selective laser melting Laser metal deposition Post heat-treatment Recrystallization Grain growth |
| url | http://www.sciencedirect.com/science/article/pii/S223878542100497X |
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