| 7075-T6铝合金激光-MIG复合焊焊接接头疲劳寿命原位研究 |
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| 引用本文： | 张寅,宋西平,常丽艳,吴圣川.7075-T6铝合金激光-MIG复合焊焊接接头疲劳寿命原位研究[J].稀有金属材料与工程,2017,46(9):2411-2416. |
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| 作者姓名： | 张寅 宋西平 常丽艳 吴圣川 |
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| 作者单位： | 北京科技大学 新金属材料国家重点实验室,北京科技大学 新金属材料国家重点实验室,北京科技大学 新金属材料国家重点实验室,西南交通大学 牵引动力国家重点实验室 |
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| 基金项目： | 国家自然科学基金项目（面上项目，重点项目，重大项目） |
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| 摘 要： | 本文对7075-T6铝合金激光复合焊焊接接头的疲劳寿命进行了探究。结果表明：疲劳裂纹萌生寿命与疲劳寿命之间存在着一定的比例关系。对于母材试样,该比值为64.5%；而对于焊接接头试样,该比值为20.2%。疲劳断口表面观察发现,母材试样的疲劳断口上存在大量韧窝,而焊接接头试样疲劳断口上存在许多气孔。这些气孔被认为是引起焊接接头疲劳裂纹萌生寿命急剧下降的主要原因。
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| 关 键 词： | 铝合金 焊接接头 原位观察 疲劳寿命 |
| 收稿时间： | 2015/9/25 0:00:00 |
| 修稿时间： | 2015/10/21 0:00:00 |
Investigation of fatigue lifetime of Laser-MIG hybrid welded joint of 7075-T6 aluminum alloy by in-situ observation |
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| Zhang Yin,Song Xiping,Chang Liyan and Wu Shengchuan.Investigation of fatigue lifetime of Laser-MIG hybrid welded joint of 7075-T6 aluminum alloy by in-situ observation[J].Rare Metal Materials and Engineering,2017,46(9):2411-2416. |
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| Authors: | Zhang Yin Song Xiping Chang Liyan and Wu Shengchuan |
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| Affiliation: | State Key Laboratory for Advanced Metals and Materials,University of Science and Technology Beijing,State Key Laboratory for Advanced Metals and Materials,University of Science and Technology Beijing,State Key Laboratory for Advanced Metals and Materials,University of Science and Technology Beijing,State Key Laboratory of Traction Power,Southwest Jiaotong University |
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| Abstract: | The fatigue lifetime of the laser-MIG hybrid welded joint of 7075-T6 aluminum alloy was studied in this paper. The results showed that there existed a strong relationship between the fatigue crack initiation lifetime and fatigue failure lifetime. For the base metal specimens the ratio of fatigue crack initiation lifetime and fatigue failure lifetime was about 64.5%, while for the welded joint specimens it was about 20.2%. The observation of fatigue fracture surface showed that there existed a large number of dimples in the base metal specimens, while there appeared lots of gas porosities in the welded joint specimens instead. These gas porosities were regarded to be the reason of lower fatigue crack initiation lifetime. |
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| Keywords: | aluminum alloy welded joint in-situ observation fatigue lifetime |
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