| 6005铝合金搭接接头组织及疲劳性能研究 |
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| 引用本文： | 白易山,杨尚磊,朱敏琪,范聪. 6005铝合金搭接接头组织及疲劳性能研究[J]. 上海工程技术大学学报, 2021, 35(1): 9-14 |
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| 作者姓名： | 白易山 杨尚磊 朱敏琪 范聪 |
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| 作者单位： | 上海工程技术大学材料工程学院,上海201620;上海工程技术大学材料工程学院,上海201620;上海工程技术大学上海市激光先进制造技术协同创新中心,上海201620 |
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| 基金项目： | 国家自然科学基金资助项目（51971129）；上海市自然科学基金资助项目（19ZR1421200） |
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| 摘 要： | 采用熔化极惰性气体保护(MIG)焊对6005铝合金进行搭接焊接试验.对焊接接头进行微观组织观察和显微硬度测试,结果显示,熔合区出现联生结晶特点,焊缝中心以等轴晶为主,热影响区(HAZ)晶粒发生严重粗化,焊缝区的维氏硬度(HV)为64.5,母材区为89.6,接头出现明显软化区.在疲劳性能测试中焊接接头疲劳强度只有母材的2...
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| 关 键 词： | 6005铝合金 微观组织 疲劳性能 裂纹扩展 |
| 收稿时间： | 2020-09-25 |
Study on Microstructure and Fatigue Properties of 6005 Aluminum Alloy Lap Joint |
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| BAI Yishan,YANG Shanglei,ZHU Minqi,FAN Cong. Study on Microstructure and Fatigue Properties of 6005 Aluminum Alloy Lap Joint[J]. Journal of Shanghai University of Engineering Science, 2021, 35(1): 9-14 |
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| Authors: | BAI Yishan YANG Shanglei ZHU Minqi FAN Cong |
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| Affiliation: | a.School of Materials Engineeringb.Shanghai Collaborative Innovation Center for Laser Advanced Manufacturing Technology, Shanghai University of Engineering Science, Shanghai 201620, China |
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| Abstract: | Metal inert-gas (MIG) welding was used to conduct lap welding experiments on 6005 aluminum alloy. The microstructure and microhardness of the welded joint were observed. The results show that the intergrowth crystal appears in the fusion zone, the equiaxed crystal is dominant in the weld center, and the grain coarsening has occurred in the heat affected zone (HAZ). The Vickers hardness (HV) of the weld zone is 64.5, and that of the base metal zone is 89.6, and the joint appears obvious softening zone. The fatigue strength of the welded joint is only 21.41% of the base material in the fatigue performance test, and the fatigue fracture of the welded joint is a mixed fracture of ductile fracture and dissociative fracture. By analyzing the mechanism of fatigue crack propagation, it is concluded that the crack propagates in a “Z” shape along the 45° direction under the condition of crack tip passivation and loading stress cycle. |
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