Characterization and thermal analysis of laser metal deposited γ-TiAl thin walls
The present work focuses on investigating the effect of process variables (power, travel speed, powder flow rate) on microstructure and mechanical properties of Laser Metal Deposited (LMD) γ-TiAl thin walls. To this end, LMD technique was used to deposit γ-TiAl thin walls at different processing con...
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| Format: | Article |
| Language: | English |
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Elsevier
2021-11-01
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| Series: | Journal of Materials Research and Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785421012709 |
| _version_ | 1819103281663705088 |
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| author | B. Mallikarjuna Srikanth Bontha Prasad Krishna Vamsi Krishna Balla |
| author_facet | B. Mallikarjuna Srikanth Bontha Prasad Krishna Vamsi Krishna Balla |
| author_sort | B. Mallikarjuna |
| collection | DOAJ |
| description | The present work focuses on investigating the effect of process variables (power, travel speed, powder flow rate) on microstructure and mechanical properties of Laser Metal Deposited (LMD) γ-TiAl thin walls. To this end, LMD technique was used to deposit γ-TiAl thin walls at different processing conditions. Microstructures of as-deposited samples were investigated using both optical and scanning electron microscopy. X-ray diffraction (XRD) technique was used to determine the phases present. Microhardness measurements were carried out along both longitudinal and build directions. Microstructural analysis of as-deposited samples revealed a fine lamellar structure comprising of γ and α2 phases. Colony size of 30–60 μm and lamellar spacing between 0.1 and 0.7 μm were observed. XRD analysis confirmed the presence of γ and α2 phases. Comparison of elemental analysis results on both powder and as-deposited samples revealed a negligible loss of Al and no oxygen pick up in the deposited thin walls. Hardness values were found to decrease with an increase in wall height, and hardness values increased marginally (5%) with an increase in travel speed. Further, 3D transient thermal analysis was also carried out to complement the LMD of thin walls in terms of melt pool dimensions and cooling rates. It was found that the melt pool depth (MPDc = 0.266 mm) is smaller at the centre than the edge (MPDe = 0.513 mm) of the wall. Cooling rates decrease with increase in the number of layers deposited. |
| first_indexed | 2024-12-22T01:47:58Z |
| format | Article |
| id | doaj.art-5f4841c7f1e74027bcbf3f04ff938096 |
| institution | Directory Open Access Journal |
| issn | 2238-7854 |
| language | English |
| last_indexed | 2024-12-22T01:47:58Z |
| publishDate | 2021-11-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Materials Research and Technology |
| spelling | doaj.art-5f4841c7f1e74027bcbf3f04ff9380962022-12-21T18:43:01ZengElsevierJournal of Materials Research and Technology2238-78542021-11-011562316243Characterization and thermal analysis of laser metal deposited γ-TiAl thin wallsB. Mallikarjuna0Srikanth Bontha1Prasad Krishna2Vamsi Krishna Balla3Department of Mechanical Engineering, Amrita School of Engineering, Coimbatore, Amrita Vishwa Vidyapeetham, India; Corresponding author.Additive Manufacturing Laboratory, Department of Mechanical Engineering, National Institute of Technology Karnataka, Surathkal, Mangaluru, 575 025, India; Corresponding author.Additive Manufacturing Laboratory, Department of Mechanical Engineering, National Institute of Technology Karnataka, Surathkal, Mangaluru, 575 025, IndiaBioceramics and Coatings Division, CSIR-Central Glass and Ceramic Research Institute, 196 Raja S.C. Mullick Road, Kolkata, 700 032, IndiaThe present work focuses on investigating the effect of process variables (power, travel speed, powder flow rate) on microstructure and mechanical properties of Laser Metal Deposited (LMD) γ-TiAl thin walls. To this end, LMD technique was used to deposit γ-TiAl thin walls at different processing conditions. Microstructures of as-deposited samples were investigated using both optical and scanning electron microscopy. X-ray diffraction (XRD) technique was used to determine the phases present. Microhardness measurements were carried out along both longitudinal and build directions. Microstructural analysis of as-deposited samples revealed a fine lamellar structure comprising of γ and α2 phases. Colony size of 30–60 μm and lamellar spacing between 0.1 and 0.7 μm were observed. XRD analysis confirmed the presence of γ and α2 phases. Comparison of elemental analysis results on both powder and as-deposited samples revealed a negligible loss of Al and no oxygen pick up in the deposited thin walls. Hardness values were found to decrease with an increase in wall height, and hardness values increased marginally (5%) with an increase in travel speed. Further, 3D transient thermal analysis was also carried out to complement the LMD of thin walls in terms of melt pool dimensions and cooling rates. It was found that the melt pool depth (MPDc = 0.266 mm) is smaller at the centre than the edge (MPDe = 0.513 mm) of the wall. Cooling rates decrease with increase in the number of layers deposited.http://www.sciencedirect.com/science/article/pii/S2238785421012709γ-TiAl alloyLaser metal depositionThin wallMicrostructureHardnessCooling rates |
| spellingShingle | B. Mallikarjuna Srikanth Bontha Prasad Krishna Vamsi Krishna Balla Characterization and thermal analysis of laser metal deposited γ-TiAl thin walls Journal of Materials Research and Technology γ-TiAl alloy Laser metal deposition Thin wall Microstructure Hardness Cooling rates |
| title | Characterization and thermal analysis of laser metal deposited γ-TiAl thin walls |
| title_full | Characterization and thermal analysis of laser metal deposited γ-TiAl thin walls |
| title_fullStr | Characterization and thermal analysis of laser metal deposited γ-TiAl thin walls |
| title_full_unstemmed | Characterization and thermal analysis of laser metal deposited γ-TiAl thin walls |
| title_short | Characterization and thermal analysis of laser metal deposited γ-TiAl thin walls |
| title_sort | characterization and thermal analysis of laser metal deposited γ tial thin walls |
| topic | γ-TiAl alloy Laser metal deposition Thin wall Microstructure Hardness Cooling rates |
| url | http://www.sciencedirect.com/science/article/pii/S2238785421012709 |
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