| 热输入对TiAl基合金电子束焊接头性能的影响 |
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| 引用本文： | 陈国庆,张秉刚,何景山,冯吉才.热输入对TiAl基合金电子束焊接头性能的影响[J].焊接学报,2007,28(6):85-88. |
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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： | 哈尔滨工业大学,现代焊接生产技术国家重点实验室,哈尔滨,150001 |
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| 摘 要： | 采用不同的焊接工艺参数对Ti43Al9V0.3Y(原子分数,%)合金进行电子束焊接,分析了不同的焊接热输入对接头组织、焊缝成形及抗拉强度的影响.结果表明,随焊接热输入的增大接头的抗拉强度也增大,但热输入过大时强度降低.TiAl基合金性能对组织非常敏感,电子束焊接时接头组织转变不充分造成变形能力差,极易形成宏观横向裂纹和纵向弧坑微裂纹.近缝区组织和硬度过渡剧烈,是接头中的薄弱环节,因此裂纹大多从弧坑扩展到近缝区而断裂.断裂性质为脆性断裂,断裂特征为解理断裂和穿晶断裂,还具有分层、穿层的断裂特征.
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| 关 键 词： | TiAl基合金 电子束焊 热输入 抗拉强度 断裂特征 |
| 文章编号： | 0253-360X（2007）06-085-04 |
| 收稿时间： | 2007/2/11 0:00:00 |
| 修稿时间： | 2007-02-11 |
Effect of heat input on mechanical properties of electron beam welded joint of TiAl based alloy |
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| CHEN Guoqing,ZHANG Binggang,HE Jingshan and FENG Jicai.Effect of heat input on mechanical properties of electron beam welded joint of TiAl based alloy[J].Transactions of The China Welding Institution,2007,28(6):85-88. |
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| Authors: | CHEN Guoqing ZHANG Binggang HE Jingshan and FENG Jicai |
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| Affiliation: | State Key Laboratory of Advanced Welding Production Technology, Harbin Institute of Technology, Harbin 150001, China,State Key Laboratory of Advanced Welding Production Technology, Harbin Institute of Technology, Harbin 150001, China,State Key Laboratory of Advanced Welding Production Technology, Harbin Institute of Technology, Harbin 150001, China and State Key Laboratory of Advanced Welding Production Technology, Harbin Institute of Technology, Harbin 150001, China |
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| Abstract: | The electron beam welding(EBW) of Ti-43Al-9V-0.3Y(at.%) alloy was carried out with different welding parameters.The effect of heat input on the joint microstructure,formation of weld and tensile strength was investigated. The results showed that the tensile strength increases with the increase of the heat input and decreases with the excessive heat input.The TiAl based alloy was sensitive to the microstructure.The insufficient structural transformation in the EBW joint results in the poor deformability.The transverse macroscopic cracking and longitudinal crater microcrack tend to formation.The transformations in the microstructure and hardness in the near weld are severe.This region is weak.Thus the crack propagates from the crater to the near weld and the fracture is a typical brittle properties,which presents cleavage fracture and transcrystalline fracture.Moreover,the layered and cross-measure fracture can be observed. |
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| Keywords: | TiAl based alloy electron beam welding heat input tensile strength fracture properties |
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