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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Autores principales:	B. Mallikarjuna, Srikanth Bontha, Prasad Krishna, Vamsi Krishna Balla
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	γ-TiAl alloy Laser metal deposition Thin wall Microstructure Hardness Cooling rates Mining engineering. Metallurgy TN1-997
Acceso en línea:	https://doaj.org/article/5f4841c7f1e74027bcbf3f04ff938096
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spelling	oai:doaj.org-article:5f4841c7f1e74027bcbf3f04ff9380962021-11-30T04:16:14ZCharacterization and thermal analysis of laser metal deposited γ-TiAl thin walls2238-785410.1016/j.jmrt.2021.10.133https://doaj.org/article/5f4841c7f1e74027bcbf3f04ff9380962021-11-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S2238785421012709https://doaj.org/toc/2238-7854The 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 pools 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. A higher cooling rate of 1.05 × 105 °C/s near the wall substrate was found for 200–12.B. MallikarjunaSrikanth BonthaPrasad KrishnaVamsi Krishna BallaElsevierarticleγ-TiAl alloyLaser metal depositionThin wallMicrostructureHardnessCooling ratesMining engineering. MetallurgyTN1-997ENJournal of Materials Research and Technology, Vol 15, Iss , Pp 6231-6243 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	γ-TiAl alloy Laser metal deposition Thin wall Microstructure Hardness Cooling rates Mining engineering. Metallurgy TN1-997
spellingShingle	γ-TiAl alloy Laser metal deposition Thin wall Microstructure Hardness Cooling rates Mining engineering. Metallurgy TN1-997 B. Mallikarjuna Srikanth Bontha Prasad Krishna Vamsi Krishna Balla Characterization and thermal analysis of laser metal deposited γ-TiAl thin walls
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 pools 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. A higher cooling rate of 1.05 × 105 °C/s near the wall substrate was found for 200–12.
format	article
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
title	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_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_sort	characterization and thermal analysis of laser metal deposited γ-tial thin walls
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/5f4841c7f1e74027bcbf3f04ff938096
work_keys_str_mv	AT bmallikarjuna characterizationandthermalanalysisoflasermetaldepositedgtialthinwalls AT srikanthbontha characterizationandthermalanalysisoflasermetaldepositedgtialthinwalls AT prasadkrishna characterizationandthermalanalysisoflasermetaldepositedgtialthinwalls AT vamsikrishnaballa characterizationandthermalanalysisoflasermetaldepositedgtialthinwalls
_version_	1718406804351746048

Characterization and thermal analysis of laser metal deposited γ-TiAl thin walls

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