| TA15钛合金电子束焊接接头不同区域的疲劳裂纹扩展行为研究 |
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| 引用本文： | 李行志,胡树兵,肖建中,王亚军,李清华,籍龙波.TA15钛合金电子束焊接接头不同区域的疲劳裂纹扩展行为研究[J].航空材料学报,2010,30(1):52-56. |
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| 作者姓名： | 李行志 胡树兵 肖建中 王亚军 李清华 籍龙波 |
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| 作者单位： | 1. 华中科技大学,材料成形与模具技术国家重点实验室,武汉,430074
2. 北京航空材料研究院,北京,100095 |
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| 摘 要： | 对TA15电子束焊接接头的熔凝区和热影响区的显微组织、硬度、疲劳裂纹扩展速率、以及疲劳断口形貌进行了研究。结果表明:熔凝区的显微组织主要为粗针状α′马氏体组织,热影响区组织为α′马氏体组织+条片状的α相和β相,由接近熔凝区组织向母材组织过渡。母材的硬度较低,熔凝区平均硬度最高,热影响区的硬度介于两者之间。疲劳裂纹扩展速率高低与其显微组织密切相关,含塑性较好的片状α相较多的热影响区比熔凝区有较高的裂纹扩展抗力。
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| 关 键 词： | TA15钛合金 电子束焊接 显微组织 疲劳裂纹扩展 |
Study on Fatigue Crack Propagation in Different Zones of TA15 Electron Beam Welded Joint |
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| LI Xingzhi,HU Shu-bing,XIAO Jian-zhong,WANG Ya-jun,LI Qing-hua,JI Long-bo.Study on Fatigue Crack Propagation in Different Zones of TA15 Electron Beam Welded Joint[J].Journal of Aeronautical Materials,2010,30(1):52-56. |
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| Authors: | LI Xingzhi HU Shu-bing XIAO Jian-zhong WANG Ya-jun LI Qing-hua JI Long-bo |
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| Abstract: | The microstructure, hardness, fatigue crack propagation and fatigue fractograph in the fusion zone (FZ) and heat affection zone (HAZ) of TA15 electron beam welded (EBW) joint were studied in this paper. The results indicate that the microstructure in FZ is characterized by bulky aciculate martensite, and in HAZ, the microstructure is composed of α' martensite + lamellar α and β. That is, it shows a transition from FZ to base material (BM). The hardness of FZ is largest,that of BM is the lowest, and HAZ with between them. The fatigue crack propagation rate is closely relative with their microstructure. The HAZ containing more plastic lamellar α exhibits a better resistance to the fatigue crack propagation than FZ. |
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| Keywords: | TA15 titanium electron beam weld (EBW) microstructure fatigue crack propagation |
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