| Effect of cooling rate on the microstructure of electron beam welded joints of two-phase TiAl-based alloy |
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| 作者姓名： | 陈国庆 张秉刚 何景山 冯吉才 |
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| 作者单位： | State Key Laboratory of Advanced Welding Production Technology,Harbin Institute of Technology, Harbin, 150001 |
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| 摘 要： | The analysis of the microstructural characterization and phase composition of electron beam welded joint zones of Ti- 43Al-9V-O. 3Y alloy has been done in this study. The welded seam is mainly composed of B2 phase, the partial γ ＋ α2 twophase lamellar structure and granular γm phase. And the lanthanon Y existed as YAl2 phase and served as grain refined. The impact of different cooling rates on joint microstructure, fracture characteristic and tensile strength were investigated. The high cooling rate restrained the structural transformation and resulted in the ordering structure. The fracture of the joint was brittle cleavage fracture because the ordering structure went against restraining the crack propagation. With the decrease of cooling rate, the transformation amounts of lamellar structure increased, and the fracture presented the layered and crosslayered characteristic.
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| 关 键 词： | 钛铝合金 电子束焊接 冷却率 微观结构 |
Effect of cooling rate on the microstructure of electron beam welded joints of two-phase TiAl-based alloy |
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| Chen Guoqing,Zhang Binggang,He Jingshan,Feng Jicai.Effect of cooling rate on the microstructure of electron beam welded joints of two-phase TiAl-based alloy[J].China Welding,2007,16(2):11-15. |
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| Authors: | Chen Guoqing Zhang Binggang He Jingshan Feng Jicai |
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| Affiliation: | [1]State Key Laboratory of Advanced Welding Production Technology,Harbin Institute of Technology, Harbin, 150001 |
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| Abstract: | The analysis of the microstructural characterization and phase composition of electron beam welded joint zones of Ti-43Al-9V-0.3Y alloy has been done in this study. The welded seam is mainly composed of B2 phase, the partial γ+α2 two-phase lamellar structure and granular γm phase. And the lanthanon Y existed as YAl2 phase and served as grain refined. The impact of different cooling rates on joint microstructure, fracture characteristic and tensile strength were investigated. The high cooling rate restrained the structural transformation and resulted in the ordering structure. The fracture of the joint was brittle cleavage fracture because the ordering structure went against restraining the crack propagation. With the decrease of cooling rate, the transformation amounts of lamellar structure increased, and the fracture presented the layered and cross-layered characteristic. |
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| Keywords: | TiAl-based alloy electron beam welding cooling rate structure |
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