Influence of Heat Treatments on Microstructure and Mechanical Properties of Ti–26Nb Alloy Elaborated In Situ by Laser Additive Manufacturing with Ti and Nb Mixed Powder
In the present work, a Ti–26Nb alloy was elaborated in situ by laser additive manufacturing (LAM) with Ti and Nb mixed powders. The alloys were annealed at temperatures ranging from 650 °C to 925 °C, and the effects of the annealing temperature on the microstructure and mec...
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2018-12-01
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| Online Access: | http://www.mdpi.com/1996-1944/12/1/61 |
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| author | Jing Wei Hongji Sun Dechuang Zhang Lunjun Gong Jianguo Lin Cuie Wen |
| author_facet | Jing Wei Hongji Sun Dechuang Zhang Lunjun Gong Jianguo Lin Cuie Wen |
| author_sort | Jing Wei |
| collection | DOAJ |
| description | In the present work, a Ti–26Nb alloy was elaborated in situ by laser additive manufacturing (LAM) with Ti and Nb mixed powders. The alloys were annealed at temperatures ranging from 650 °C to 925 °C, and the effects of the annealing temperature on the microstructure and mechanical properties were investigated. It has been found that the microstructure of the as-deposited alloy obtained in the present conditions is characterized by columnar prior β grains with a relatively strong <001> fiber texture in the build direction. The as-deposited alloy exhibits extremely high strength, and its ultimate tensile strength and yield strength are about 799 MPa and 768 MPa, respectively. The annealing temperature has significant effects on the microstructure and mechanical properties of the alloys. Annealing treatment can promote the dissolution of unmelted Nb particles and eliminate the micro-segregation of Nb at the elliptical-shaped grain boundaries, while increasing the grain size of the alloy. With an increase in annealing temperature, the strength of the alloy decreases but the ductility increases. The alloy annealed at 850 °C exhibits a balance of strength and ductility. |
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| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-04-13T08:08:43Z |
| publishDate | 2018-12-01 |
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| spelling | doaj.art-083a3b5be40a43f584182a00d537502e2022-12-22T02:55:04ZengMDPI AGMaterials1996-19442018-12-011216110.3390/ma12010061ma12010061Influence of Heat Treatments on Microstructure and Mechanical Properties of Ti–26Nb Alloy Elaborated In Situ by Laser Additive Manufacturing with Ti and Nb Mixed PowderJing Wei0Hongji Sun1Dechuang Zhang2Lunjun Gong3Jianguo Lin4Cuie Wen5School of Materials Science and Engineering, Xiangtan University, Xiangtan 411105, ChinaSchool of Materials Science and Engineering, Xiangtan University, Xiangtan 411105, ChinaKey Laboratory of Materials Design and Preparation Technology of Hunan Province, Xiangtan University, Xiangtan 411105, ChinaKey Laboratory of Materials Design and Preparation Technology of Hunan Province, Xiangtan University, Xiangtan 411105, ChinaSchool of Materials Science and Engineering, Xiangtan University, Xiangtan 411105, ChinaSchool of Aerospace, Mechanical and Manufacturing Engineering, RMIT University, Melbourne 3083, AustraliaIn the present work, a Ti–26Nb alloy was elaborated in situ by laser additive manufacturing (LAM) with Ti and Nb mixed powders. The alloys were annealed at temperatures ranging from 650 °C to 925 °C, and the effects of the annealing temperature on the microstructure and mechanical properties were investigated. It has been found that the microstructure of the as-deposited alloy obtained in the present conditions is characterized by columnar prior β grains with a relatively strong <001> fiber texture in the build direction. The as-deposited alloy exhibits extremely high strength, and its ultimate tensile strength and yield strength are about 799 MPa and 768 MPa, respectively. The annealing temperature has significant effects on the microstructure and mechanical properties of the alloys. Annealing treatment can promote the dissolution of unmelted Nb particles and eliminate the micro-segregation of Nb at the elliptical-shaped grain boundaries, while increasing the grain size of the alloy. With an increase in annealing temperature, the strength of the alloy decreases but the ductility increases. The alloy annealed at 850 °C exhibits a balance of strength and ductility.http://www.mdpi.com/1996-1944/12/1/61heat treatmentin situ alloyinglaser additive manufacturingmechanical propertiesmicrostructureTi–Nb alloy |
| spellingShingle | Jing Wei Hongji Sun Dechuang Zhang Lunjun Gong Jianguo Lin Cuie Wen Influence of Heat Treatments on Microstructure and Mechanical Properties of Ti–26Nb Alloy Elaborated In Situ by Laser Additive Manufacturing with Ti and Nb Mixed Powder Materials heat treatment in situ alloying laser additive manufacturing mechanical properties microstructure Ti–Nb alloy |
| title | Influence of Heat Treatments on Microstructure and Mechanical Properties of Ti–26Nb Alloy Elaborated In Situ by Laser Additive Manufacturing with Ti and Nb Mixed Powder |
| title_full | Influence of Heat Treatments on Microstructure and Mechanical Properties of Ti–26Nb Alloy Elaborated In Situ by Laser Additive Manufacturing with Ti and Nb Mixed Powder |
| title_fullStr | Influence of Heat Treatments on Microstructure and Mechanical Properties of Ti–26Nb Alloy Elaborated In Situ by Laser Additive Manufacturing with Ti and Nb Mixed Powder |
| title_full_unstemmed | Influence of Heat Treatments on Microstructure and Mechanical Properties of Ti–26Nb Alloy Elaborated In Situ by Laser Additive Manufacturing with Ti and Nb Mixed Powder |
| title_short | Influence of Heat Treatments on Microstructure and Mechanical Properties of Ti–26Nb Alloy Elaborated In Situ by Laser Additive Manufacturing with Ti and Nb Mixed Powder |
| title_sort | influence of heat treatments on microstructure and mechanical properties of ti 26nb alloy elaborated in situ by laser additive manufacturing with ti and nb mixed powder |
| topic | heat treatment in situ alloying laser additive manufacturing mechanical properties microstructure Ti–Nb alloy |
| url | http://www.mdpi.com/1996-1944/12/1/61 |
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