Selective Laser Melting Additive Manufactured Tantalum: Effect of Microstructure and Impurities on the Strengthening-Toughing Mechanism
The balance between the strength and the toughness of pure tantalum (Ta) fabricated with selective laser melting (SLM) additive manufacturing is a major challenge due to the defect generation and affinity for oxygen and nitrogen. This study investigated the effects of energy density and post-vacuum...
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MDPI AG
2023-04-01
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| Online Access: | https://www.mdpi.com/1996-1944/16/8/3161 |
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| author | Fengjun Lian Longqing Chen Changgui Wu Zhuang Zhao Jingang Tang Jun Zhu |
| author_facet | Fengjun Lian Longqing Chen Changgui Wu Zhuang Zhao Jingang Tang Jun Zhu |
| author_sort | Fengjun Lian |
| collection | DOAJ |
| description | The balance between the strength and the toughness of pure tantalum (Ta) fabricated with selective laser melting (SLM) additive manufacturing is a major challenge due to the defect generation and affinity for oxygen and nitrogen. This study investigated the effects of energy density and post-vacuum annealing on the relative density and microstructure of SLMed tantalum. The influences of microstructure and impurities on strength and toughness were mainly analyzed. The results indicated that the toughness of SLMed tantalum significantly increased due to a reduction in pore defects and oxygen-nitrogen impurities, with energy density decreasing from 342 J/mm<sup>3</sup> to 190 J/mm<sup>3</sup>. The oxygen impurities mainly stemmed from the gas inclusions of tantalum powders, while nitrogen impurities were mainly from the chemical reaction between the molten liquid tantalum and nitrogen in the atmosphere. The proportion of <110> texture decreased after vacuum-annealing at 1200 °C, while that of the <100> texture increased. Concurrently, the density of dislocations and small-angle grain boundaries significantly decreased while the resistance of the deformation dislocation slip was significantly reduced, enhancing the fractured elongation up to 28% at the expense of 14% tensile strength. |
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| id | doaj.art-68698f3419314d83a6b44e9bcc05eb9e |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-11T04:47:37Z |
| publishDate | 2023-04-01 |
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| spelling | doaj.art-68698f3419314d83a6b44e9bcc05eb9e2023-11-17T20:13:59ZengMDPI AGMaterials1996-19442023-04-01168316110.3390/ma16083161Selective Laser Melting Additive Manufactured Tantalum: Effect of Microstructure and Impurities on the Strengthening-Toughing MechanismFengjun Lian0Longqing Chen1Changgui Wu2Zhuang Zhao3Jingang Tang4Jun Zhu5College of Physics, Sichuan University, Chengdu 610065, ChinaKey Laboratory of Radiation Physics and Technology of Ministry of Education, Institute of Nuclear Science and Technology, Sichuan University, Chengdu 610064, ChinaCollege of Physics, Sichuan University, Chengdu 610065, ChinaInstitute of Machinery Manufacturing Technology, China Academy of Engineering Physics, Mianyang 621900, ChinaInstitute of Machinery Manufacturing Technology, China Academy of Engineering Physics, Mianyang 621900, ChinaCollege of Physics, Sichuan University, Chengdu 610065, ChinaThe balance between the strength and the toughness of pure tantalum (Ta) fabricated with selective laser melting (SLM) additive manufacturing is a major challenge due to the defect generation and affinity for oxygen and nitrogen. This study investigated the effects of energy density and post-vacuum annealing on the relative density and microstructure of SLMed tantalum. The influences of microstructure and impurities on strength and toughness were mainly analyzed. The results indicated that the toughness of SLMed tantalum significantly increased due to a reduction in pore defects and oxygen-nitrogen impurities, with energy density decreasing from 342 J/mm<sup>3</sup> to 190 J/mm<sup>3</sup>. The oxygen impurities mainly stemmed from the gas inclusions of tantalum powders, while nitrogen impurities were mainly from the chemical reaction between the molten liquid tantalum and nitrogen in the atmosphere. The proportion of <110> texture decreased after vacuum-annealing at 1200 °C, while that of the <100> texture increased. Concurrently, the density of dislocations and small-angle grain boundaries significantly decreased while the resistance of the deformation dislocation slip was significantly reduced, enhancing the fractured elongation up to 28% at the expense of 14% tensile strength.https://www.mdpi.com/1996-1944/16/8/3161tantalumselective laser meltingimpuritystrengthtoughness |
| spellingShingle | Fengjun Lian Longqing Chen Changgui Wu Zhuang Zhao Jingang Tang Jun Zhu Selective Laser Melting Additive Manufactured Tantalum: Effect of Microstructure and Impurities on the Strengthening-Toughing Mechanism Materials tantalum selective laser melting impurity strength toughness |
| title | Selective Laser Melting Additive Manufactured Tantalum: Effect of Microstructure and Impurities on the Strengthening-Toughing Mechanism |
| title_full | Selective Laser Melting Additive Manufactured Tantalum: Effect of Microstructure and Impurities on the Strengthening-Toughing Mechanism |
| title_fullStr | Selective Laser Melting Additive Manufactured Tantalum: Effect of Microstructure and Impurities on the Strengthening-Toughing Mechanism |
| title_full_unstemmed | Selective Laser Melting Additive Manufactured Tantalum: Effect of Microstructure and Impurities on the Strengthening-Toughing Mechanism |
| title_short | Selective Laser Melting Additive Manufactured Tantalum: Effect of Microstructure and Impurities on the Strengthening-Toughing Mechanism |
| title_sort | selective laser melting additive manufactured tantalum effect of microstructure and impurities on the strengthening toughing mechanism |
| topic | tantalum selective laser melting impurity strength toughness |
| url | https://www.mdpi.com/1996-1944/16/8/3161 |
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