Enhancement of Microstructure and Mechanical Properties of High Nb-TiAl Alloys Prepared Using Laser Additive Manufacturing by Annealing Treatment
The microstructure, phase composition, hardness, and tensile properties of the Ti-48Al-2Cr-5Nb alloy have been systematically investigated using laser additive manufacturing technology. Results indicate that both the as-deposited and annealed microstructures contain both the α<sub>2</sub>...
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| Format: | Article |
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MDPI AG
2023-09-01
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| Series: | Metals |
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| Online Access: | https://www.mdpi.com/2075-4701/13/9/1562 |
| _version_ | 1827725354528145408 |
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| author | Jianhui Liang Zhanqi Liu Haijiang Wang Guili Yin Xiaoou Zhu |
| author_facet | Jianhui Liang Zhanqi Liu Haijiang Wang Guili Yin Xiaoou Zhu |
| author_sort | Jianhui Liang |
| collection | DOAJ |
| description | The microstructure, phase composition, hardness, and tensile properties of the Ti-48Al-2Cr-5Nb alloy have been systematically investigated using laser additive manufacturing technology. Results indicate that both the as-deposited and annealed microstructures contain both the α<sub>2</sub> (Ti<sub>3</sub>Al) and γ (TiAl) phases. As the annealing temperature increased, the structure changed significantly from a large block structure to a fine equiaxed structure and finally to a large lamellar structure. Nevertheless, the amount and distribution of precipitation of α<sub>2</sub> phase are obviously different, especially during the annealing at 1260 °C, where the fine α<sub>2</sub> phases are evenly distributed on the γ phase matrix. The hardness value of the as-deposited sample is the highest, with a HV value of 484 at the room temperature, while the hardness value of the annealed sample at 1260 °C is the smallest, with a HV value of 344. An annealed sample at 1260 °C exhibits the highest tensile strength and elongation at room temperature, with values of 598 MPa and 2.1%, respectively. These values are increased by 1.15 times and 1.4 times compared to the as-deposited sample (519 MPa, 1.5%). |
| first_indexed | 2024-03-10T22:28:10Z |
| format | Article |
| id | doaj.art-98608f88ec404c8da1db63ae7ae2be29 |
| institution | Directory Open Access Journal |
| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-03-10T22:28:10Z |
| publishDate | 2023-09-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Metals |
| spelling | doaj.art-98608f88ec404c8da1db63ae7ae2be292023-11-19T11:56:41ZengMDPI AGMetals2075-47012023-09-01139156210.3390/met13091562Enhancement of Microstructure and Mechanical Properties of High Nb-TiAl Alloys Prepared Using Laser Additive Manufacturing by Annealing TreatmentJianhui Liang0Zhanqi Liu1Haijiang Wang2Guili Yin3Xiaoou Zhu4School of Materials Science and Engineering, Liaoning University of Technology, Jinzhou 121001, ChinaSchool of Materials Science and Engineering, Liaoning University of Technology, Jinzhou 121001, ChinaSchool of Materials Science and Engineering, Liaoning University of Technology, Jinzhou 121001, ChinaSchool of Materials Science and Engineering, Liaoning University of Technology, Jinzhou 121001, ChinaSchool of Materials Science and Engineering, Liaoning University of Technology, Jinzhou 121001, ChinaThe microstructure, phase composition, hardness, and tensile properties of the Ti-48Al-2Cr-5Nb alloy have been systematically investigated using laser additive manufacturing technology. Results indicate that both the as-deposited and annealed microstructures contain both the α<sub>2</sub> (Ti<sub>3</sub>Al) and γ (TiAl) phases. As the annealing temperature increased, the structure changed significantly from a large block structure to a fine equiaxed structure and finally to a large lamellar structure. Nevertheless, the amount and distribution of precipitation of α<sub>2</sub> phase are obviously different, especially during the annealing at 1260 °C, where the fine α<sub>2</sub> phases are evenly distributed on the γ phase matrix. The hardness value of the as-deposited sample is the highest, with a HV value of 484 at the room temperature, while the hardness value of the annealed sample at 1260 °C is the smallest, with a HV value of 344. An annealed sample at 1260 °C exhibits the highest tensile strength and elongation at room temperature, with values of 598 MPa and 2.1%, respectively. These values are increased by 1.15 times and 1.4 times compared to the as-deposited sample (519 MPa, 1.5%).https://www.mdpi.com/2075-4701/13/9/1562laser additive manufacturingannealing treatmenthigh Nb-TiAl alloysmicrostructuremechanical properties |
| spellingShingle | Jianhui Liang Zhanqi Liu Haijiang Wang Guili Yin Xiaoou Zhu Enhancement of Microstructure and Mechanical Properties of High Nb-TiAl Alloys Prepared Using Laser Additive Manufacturing by Annealing Treatment Metals laser additive manufacturing annealing treatment high Nb-TiAl alloys microstructure mechanical properties |
| title | Enhancement of Microstructure and Mechanical Properties of High Nb-TiAl Alloys Prepared Using Laser Additive Manufacturing by Annealing Treatment |
| title_full | Enhancement of Microstructure and Mechanical Properties of High Nb-TiAl Alloys Prepared Using Laser Additive Manufacturing by Annealing Treatment |
| title_fullStr | Enhancement of Microstructure and Mechanical Properties of High Nb-TiAl Alloys Prepared Using Laser Additive Manufacturing by Annealing Treatment |
| title_full_unstemmed | Enhancement of Microstructure and Mechanical Properties of High Nb-TiAl Alloys Prepared Using Laser Additive Manufacturing by Annealing Treatment |
| title_short | Enhancement of Microstructure and Mechanical Properties of High Nb-TiAl Alloys Prepared Using Laser Additive Manufacturing by Annealing Treatment |
| title_sort | enhancement of microstructure and mechanical properties of high nb tial alloys prepared using laser additive manufacturing by annealing treatment |
| topic | laser additive manufacturing annealing treatment high Nb-TiAl alloys microstructure mechanical properties |
| url | https://www.mdpi.com/2075-4701/13/9/1562 |
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