Effect of heat distribution on microstructure and mechanical properties of electron beam welded dissimilar TiAl/TC4 joint
Microstructure and mechanical properties of electron beam welded TiAl/TC4 joints are sensitive to heat input due to the complex solid-state transformation of the weld. Experiments and numerical simulations were conducted to investigate the effect of heat distribution on microstructure and mechanical...
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doaj-474297d64a324023a639c781fd3870092021-01-02T05:11:39ZengElsevierJournal of Materials Research and Technology2238-78542020-11-01961302713035Effect of heat distribution on microstructure and mechanical properties of electron beam welded dissimilar TiAl/TC4 jointGuoqing Chen0Ge Zhang1Hongzhou Wang2Qianxing Yin3Yongxian Huang4Binggang Zhang5State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China; Corresponding authors.State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, ChinaChinese Flight Test Establishment, Xi’an 710089, ChinaState Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, ChinaState Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China; Corresponding authors.State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, ChinaMicrostructure and mechanical properties of electron beam welded TiAl/TC4 joints are sensitive to heat input due to the complex solid-state transformation of the weld. Experiments and numerical simulations were conducted to investigate the effect of heat distribution on microstructure and mechanical properties of the joint in detail. The brittle α2-Ti3Al dominated microstructure was generated in the weld that underwent high peak temperature and rapid cooling rate during welding process. Thermodynamic analysis revealed that the Gibbs free energy of formation of Ti3Al was greatly lower than that of TiAl at a high temperature (≥ α single phase region), which is benefit for the formation of α2 phase. Brittle α2 phase was also generated in the heat affected zone on TiAl side, with decreased content from the weld to base metal owing to the gradually reduced heat flux. The ambient temperature tensile strength of the joint was 386.3MPa. All joints were fractured along the fusion line and exhibit brittle fracture characteristics.http://www.sciencedirect.com/science/article/pii/S2238785420317701TiAlPhase transformationWeldingMechanical property |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Guoqing Chen Ge Zhang Hongzhou Wang Qianxing Yin Yongxian Huang Binggang Zhang |
spellingShingle |
Guoqing Chen Ge Zhang Hongzhou Wang Qianxing Yin Yongxian Huang Binggang Zhang Effect of heat distribution on microstructure and mechanical properties of electron beam welded dissimilar TiAl/TC4 joint Journal of Materials Research and Technology TiAl Phase transformation Welding Mechanical property |
author_facet |
Guoqing Chen Ge Zhang Hongzhou Wang Qianxing Yin Yongxian Huang Binggang Zhang |
author_sort |
Guoqing Chen |
title |
Effect of heat distribution on microstructure and mechanical properties of electron beam welded dissimilar TiAl/TC4 joint |
title_short |
Effect of heat distribution on microstructure and mechanical properties of electron beam welded dissimilar TiAl/TC4 joint |
title_full |
Effect of heat distribution on microstructure and mechanical properties of electron beam welded dissimilar TiAl/TC4 joint |
title_fullStr |
Effect of heat distribution on microstructure and mechanical properties of electron beam welded dissimilar TiAl/TC4 joint |
title_full_unstemmed |
Effect of heat distribution on microstructure and mechanical properties of electron beam welded dissimilar TiAl/TC4 joint |
title_sort |
effect of heat distribution on microstructure and mechanical properties of electron beam welded dissimilar tial/tc4 joint |
publisher |
Elsevier |
series |
Journal of Materials Research and Technology |
issn |
2238-7854 |
publishDate |
2020-11-01 |
description |
Microstructure and mechanical properties of electron beam welded TiAl/TC4 joints are sensitive to heat input due to the complex solid-state transformation of the weld. Experiments and numerical simulations were conducted to investigate the effect of heat distribution on microstructure and mechanical properties of the joint in detail. The brittle α2-Ti3Al dominated microstructure was generated in the weld that underwent high peak temperature and rapid cooling rate during welding process. Thermodynamic analysis revealed that the Gibbs free energy of formation of Ti3Al was greatly lower than that of TiAl at a high temperature (≥ α single phase region), which is benefit for the formation of α2 phase. Brittle α2 phase was also generated in the heat affected zone on TiAl side, with decreased content from the weld to base metal owing to the gradually reduced heat flux. The ambient temperature tensile strength of the joint was 386.3MPa. All joints were fractured along the fusion line and exhibit brittle fracture characteristics. |
topic |
TiAl Phase transformation Welding Mechanical property |
url |
http://www.sciencedirect.com/science/article/pii/S2238785420317701 |
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