Evolution of microstructure and mechanical properties in the molten pool of γ-TiAl alloy synthesized in situ by dual-wire-fed electron beam directed energy deposition

Dual-wire-fed electron beam directed energy deposition (EB-DED) is a highly efficient technique for additive manufacturing (AM) of TiAl alloys, but research into the evolution of microstructure and mechanical properties within the melt pool is limited. Experimental and numerical simulations are used...

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Main Authors: Qi Lv, Liang Wang, Ran Cui, Chen Liu, Baoxian Su, Binbin Wang, Ruirun Chen, Hongze Fang, Longhui Yao, Liangshun Luo, Yanqing Su
Format: Article
Language:English
Published: Elsevier 2023-09-01
Series:Journal of Materials Research and Technology
Subjects:
Online Access:http://www.sciencedirect.com/science/article/pii/S2238785423016861
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author Qi Lv
Liang Wang
Ran Cui
Chen Liu
Baoxian Su
Binbin Wang
Ruirun Chen
Hongze Fang
Longhui Yao
Liangshun Luo
Yanqing Su
author_facet Qi Lv
Liang Wang
Ran Cui
Chen Liu
Baoxian Su
Binbin Wang
Ruirun Chen
Hongze Fang
Longhui Yao
Liangshun Luo
Yanqing Su
author_sort Qi Lv
collection DOAJ
description Dual-wire-fed electron beam directed energy deposition (EB-DED) is a highly efficient technique for additive manufacturing (AM) of TiAl alloys, but research into the evolution of microstructure and mechanical properties within the melt pool is limited. Experimental and numerical simulations are used together to study the evolution along the vertical direction within the TiAl alloy melt pool. The chemical composition, microstructure and microhardness in the top region (TR), middle region (MR) and bottom region (BR) within the melt pool were characterized and comparatively analysed. The results showed that the Al content decreased from 52 at. % to 49 at. % from the top to the bottom, the grain size increased and then decreased, and the grain aspect ratio increased from 1 to over 3. The decreasing size factor and increasing shape factor result in variations in grain size and shape. The improvement in microhardness from 226 HV0.5 to 280 HV0.5 was quantitatively analysed as being mainly due to the reduction in Al content. The results of this study are of paramount importance in facilitating the use of the dual-wire-fed EB-DED technique for the production of high performance TiAl alloy components.
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spelling doaj.art-0cac9f59ecaf46f192c27ea7e8cb17352023-10-30T06:02:36ZengElsevierJournal of Materials Research and Technology2238-78542023-09-0126417433Evolution of microstructure and mechanical properties in the molten pool of γ-TiAl alloy synthesized in situ by dual-wire-fed electron beam directed energy depositionQi Lv0Liang Wang1Ran Cui2Chen Liu3Baoxian Su4Binbin Wang5Ruirun Chen6Hongze Fang7Longhui Yao8Liangshun Luo9Yanqing Su10National Key Laboratory for Precision Hot Processing of Metals, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, ChinaCorresponding author.; National Key Laboratory for Precision Hot Processing of Metals, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, ChinaNational Key Laboratory for Precision Hot Processing of Metals, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, ChinaNational Key Laboratory for Precision Hot Processing of Metals, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, ChinaNational Key Laboratory for Precision Hot Processing of Metals, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, ChinaNational Key Laboratory for Precision Hot Processing of Metals, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, ChinaNational Key Laboratory for Precision Hot Processing of Metals, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, ChinaNational Key Laboratory for Precision Hot Processing of Metals, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, ChinaNational Key Laboratory for Precision Hot Processing of Metals, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, ChinaNational Key Laboratory for Precision Hot Processing of Metals, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, ChinaNational Key Laboratory for Precision Hot Processing of Metals, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, ChinaDual-wire-fed electron beam directed energy deposition (EB-DED) is a highly efficient technique for additive manufacturing (AM) of TiAl alloys, but research into the evolution of microstructure and mechanical properties within the melt pool is limited. Experimental and numerical simulations are used together to study the evolution along the vertical direction within the TiAl alloy melt pool. The chemical composition, microstructure and microhardness in the top region (TR), middle region (MR) and bottom region (BR) within the melt pool were characterized and comparatively analysed. The results showed that the Al content decreased from 52 at. % to 49 at. % from the top to the bottom, the grain size increased and then decreased, and the grain aspect ratio increased from 1 to over 3. The decreasing size factor and increasing shape factor result in variations in grain size and shape. The improvement in microhardness from 226 HV0.5 to 280 HV0.5 was quantitatively analysed as being mainly due to the reduction in Al content. The results of this study are of paramount importance in facilitating the use of the dual-wire-fed EB-DED technique for the production of high performance TiAl alloy components.http://www.sciencedirect.com/science/article/pii/S2238785423016861TiAl alloyDirected energy depositionMicrostructureNumerical simulationMechanical property
spellingShingle Qi Lv
Liang Wang
Ran Cui
Chen Liu
Baoxian Su
Binbin Wang
Ruirun Chen
Hongze Fang
Longhui Yao
Liangshun Luo
Yanqing Su
Evolution of microstructure and mechanical properties in the molten pool of γ-TiAl alloy synthesized in situ by dual-wire-fed electron beam directed energy deposition
Journal of Materials Research and Technology
TiAl alloy
Directed energy deposition
Microstructure
Numerical simulation
Mechanical property
title Evolution of microstructure and mechanical properties in the molten pool of γ-TiAl alloy synthesized in situ by dual-wire-fed electron beam directed energy deposition
title_full Evolution of microstructure and mechanical properties in the molten pool of γ-TiAl alloy synthesized in situ by dual-wire-fed electron beam directed energy deposition
title_fullStr Evolution of microstructure and mechanical properties in the molten pool of γ-TiAl alloy synthesized in situ by dual-wire-fed electron beam directed energy deposition
title_full_unstemmed Evolution of microstructure and mechanical properties in the molten pool of γ-TiAl alloy synthesized in situ by dual-wire-fed electron beam directed energy deposition
title_short Evolution of microstructure and mechanical properties in the molten pool of γ-TiAl alloy synthesized in situ by dual-wire-fed electron beam directed energy deposition
title_sort evolution of microstructure and mechanical properties in the molten pool of γ tial alloy synthesized in situ by dual wire fed electron beam directed energy deposition
topic TiAl alloy
Directed energy deposition
Microstructure
Numerical simulation
Mechanical property
url http://www.sciencedirect.com/science/article/pii/S2238785423016861
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