Hydrogen-Induced Phase Transformation and Microstructure Evolution for Ti-6Al-4V Parts Produced by Electron Beam Melting
In this paper, phase transitions and microstructure evolution in titanium Ti-6Al-4V alloy parts produced by electron beam melting (EBM) under hydrogenation was investigated. Hydrogenation was carried out at the temperature of 650 °C to the absolute hydrogen concentrations in the samples of 0...
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MDPI AG
2018-04-01
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| author | Natalia Pushilina Alexey Panin Maxim Syrtanov Egor Kashkarov Viktor Kudiiarov Olga Perevalova Roman Laptev Andrey Lider Andrey Koptyug |
| author_facet | Natalia Pushilina Alexey Panin Maxim Syrtanov Egor Kashkarov Viktor Kudiiarov Olga Perevalova Roman Laptev Andrey Lider Andrey Koptyug |
| author_sort | Natalia Pushilina |
| collection | DOAJ |
| description | In this paper, phase transitions and microstructure evolution in titanium Ti-6Al-4V alloy parts produced by electron beam melting (EBM) under hydrogenation was investigated. Hydrogenation was carried out at the temperature of 650 °C to the absolute hydrogen concentrations in the samples of 0.29, 0.58, and 0.90 wt. %. Comparative analysis of microstructure changes in Ti-6Al-4V alloy parts was performed using scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray diffraction (XRD). Furthermore, in-situ XRD was used to investigate the phase transitions in the samples during hydrogenation. The structure of Ti-6Al-4V parts produced by EBM is represented by the α phase plates with the transverse length of 0.2 μm, the β phase both in the form of plates and globular grains, and metastable α″ and ω phases. Hydrogenation to the concentration of 0.29 wt. % leads to the formation of intermetallic Ti3Al phase. The dimensions of intermetallic Ti3Al plates and their volume fraction increase significantly with hydrogen concentration up to 0.58 wt. % along with precipitation of nano-sized crystals of titanium δ hydrides. Individual Ti3Al plates decay into nanocrystals with increasing hydrogen concentration up to 0.9 wt. % accompanied by the increase of proportion and size of hydride plates. Hardness of EBM Ti-6Al-4V alloy decreases with hydrogen content. |
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| spelling | doaj.art-d03a76e8d44548988c1cb8a1b91578472022-12-22T02:43:58ZengMDPI AGMetals2075-47012018-04-018530110.3390/met8050301met8050301Hydrogen-Induced Phase Transformation and Microstructure Evolution for Ti-6Al-4V Parts Produced by Electron Beam MeltingNatalia Pushilina0Alexey Panin1Maxim Syrtanov2Egor Kashkarov3Viktor Kudiiarov4Olga Perevalova5Roman Laptev6Andrey Lider7Andrey Koptyug8School of Nuclear Physics, National Research Tomsk Polytechnic University, Tomsk 634050, RussiaSchool of Nuclear Physics, National Research Tomsk Polytechnic University, Tomsk 634050, RussiaSchool of Nuclear Physics, National Research Tomsk Polytechnic University, Tomsk 634050, RussiaSchool of Nuclear Physics, National Research Tomsk Polytechnic University, Tomsk 634050, RussiaSchool of Nuclear Physics, National Research Tomsk Polytechnic University, Tomsk 634050, RussiaInstitute of Strength Physics and Materials Science of Siberian Branch of Russian Academy of Sciences, Tomsk 634055, RussiaSchool of Nuclear Physics, National Research Tomsk Polytechnic University, Tomsk 634050, RussiaSchool of Nuclear Physics, National Research Tomsk Polytechnic University, Tomsk 634050, RussiaSports Tech Research Centre, Mid Sweden University, Akademigatan 1, SE-831 25 Östersund, SwedenIn this paper, phase transitions and microstructure evolution in titanium Ti-6Al-4V alloy parts produced by electron beam melting (EBM) under hydrogenation was investigated. Hydrogenation was carried out at the temperature of 650 °C to the absolute hydrogen concentrations in the samples of 0.29, 0.58, and 0.90 wt. %. Comparative analysis of microstructure changes in Ti-6Al-4V alloy parts was performed using scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray diffraction (XRD). Furthermore, in-situ XRD was used to investigate the phase transitions in the samples during hydrogenation. The structure of Ti-6Al-4V parts produced by EBM is represented by the α phase plates with the transverse length of 0.2 μm, the β phase both in the form of plates and globular grains, and metastable α″ and ω phases. Hydrogenation to the concentration of 0.29 wt. % leads to the formation of intermetallic Ti3Al phase. The dimensions of intermetallic Ti3Al plates and their volume fraction increase significantly with hydrogen concentration up to 0.58 wt. % along with precipitation of nano-sized crystals of titanium δ hydrides. Individual Ti3Al plates decay into nanocrystals with increasing hydrogen concentration up to 0.9 wt. % accompanied by the increase of proportion and size of hydride plates. Hardness of EBM Ti-6Al-4V alloy decreases with hydrogen content.http://www.mdpi.com/2075-4701/8/5/301electron beam meltingadditive manufacturingtitanium Ti-6Al-4V alloyhydrogenmicrostructurephase transitions |
| spellingShingle | Natalia Pushilina Alexey Panin Maxim Syrtanov Egor Kashkarov Viktor Kudiiarov Olga Perevalova Roman Laptev Andrey Lider Andrey Koptyug Hydrogen-Induced Phase Transformation and Microstructure Evolution for Ti-6Al-4V Parts Produced by Electron Beam Melting Metals electron beam melting additive manufacturing titanium Ti-6Al-4V alloy hydrogen microstructure phase transitions |
| title | Hydrogen-Induced Phase Transformation and Microstructure Evolution for Ti-6Al-4V Parts Produced by Electron Beam Melting |
| title_full | Hydrogen-Induced Phase Transformation and Microstructure Evolution for Ti-6Al-4V Parts Produced by Electron Beam Melting |
| title_fullStr | Hydrogen-Induced Phase Transformation and Microstructure Evolution for Ti-6Al-4V Parts Produced by Electron Beam Melting |
| title_full_unstemmed | Hydrogen-Induced Phase Transformation and Microstructure Evolution for Ti-6Al-4V Parts Produced by Electron Beam Melting |
| title_short | Hydrogen-Induced Phase Transformation and Microstructure Evolution for Ti-6Al-4V Parts Produced by Electron Beam Melting |
| title_sort | hydrogen induced phase transformation and microstructure evolution for ti 6al 4v parts produced by electron beam melting |
| topic | electron beam melting additive manufacturing titanium Ti-6Al-4V alloy hydrogen microstructure phase transitions |
| url | http://www.mdpi.com/2075-4701/8/5/301 |
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