| 纯铝纯铁搅拌摩擦焊接头的组织与力学性能 |
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| 引用本文： | 裴瑜,高坤元,张小军,黄晖,吴晓蓝,文胜平,聂祚仁.纯铝纯铁搅拌摩擦焊接头的组织与力学性能[J].金属热处理,2023,48(2):36-42. |
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| 作者姓名： | 裴瑜 高坤元 张小军 黄晖 吴晓蓝 文胜平 聂祚仁 |
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| 作者单位： | 北京工业大学 新型功能材料教育部重点实验室, 北京 100124 |
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| 基金项目： | 国家重点研发计划(2021YFB3704201,2021YFB3704205);北京市自然科学基金(2202009) |
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| 摘 要： | 选用3 mm厚冷轧态高纯铝板和退火态高纯铁板作为焊接母材，使用300/400/500/600 r/min-100 mm/min和300 r/min-80/60 mm/min焊接参数进行铝/铁异种金属搅拌摩擦焊对接焊试验。对焊接接头进行显微硬度和拉伸性能测试，通过扫描电镜(SEM)、能谱仪(EDS)、电子背散射衍射(EBSD)等对接头组织进行表征。焊缝宏观形貌观察发现，焊缝的正面和背面有孔洞，正面出现毛刺。随着转速焊速比增加，孔洞消失毛刺增加。拉伸试验结果显示，共出现3种失效模式，分别为在300 r/min-100 mm/min参数下孔洞缺陷处断裂，300 r/min-80/60 mm/min参数下Al/Fe界面断裂和400/500/600 r/min-100 mm/min处Al侧基体断裂，3种模式下的最大焊接效率分别为40.1%、41.0%和60.4%,其中Al侧基体断裂模式的焊接效率最高。出现在焊核区的孔洞降低了接头强度，导致了缺陷断裂；在300 r/min低转速下，界面未达到有效的冶金结合，界面强度低于Al基体强度，导致Al/Fe界面断裂。硬度试验结果显示，铝侧硬度呈现先下降后上升...
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| 关 键 词： | 铝/铁异种金属 搅拌摩擦焊 失效模式 冶金结合 力学性能 |
| 收稿时间： | 2022-09-24 |
Microstructure and mechanical properties of friction stir welded joint of pure aluminum-iron |
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| Pei Yu,Gao Kunyuan,Zhang Xiaojun,Huang Hui,Wu Xiaolan,Wen Shengping,Nie Zuoren.Microstructure and mechanical properties of friction stir welded joint of pure aluminum-iron[J].Heat Treatment of Metals,2023,48(2):36-42. |
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| Authors: | Pei Yu Gao Kunyuan Zhang Xiaojun Huang Hui Wu Xiaolan Wen Shengping Nie Zuoren |
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| Affiliation: | Key Laboratory of Advanced Functional Materials, Education Ministry of China, Beijing University of Technology, Beijing 100124, China |
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| Abstract: | 3 mm thickness cold rolled high purity aluminum plate and as-annealed iron plate were selected as the welding base materials, and welding parameters of 300/400/500/600 r/min-100 mm/min and 300 r/min-80/60 mm/min were respectively used to conduct friction stir welding butt welding experiments of aluminum/iron dissimilar metal. The mechanical properties of the joints were tested by microhardness test and tensile test, and the microstructure of the joints was characterized by scanning electron microscope(SEM), energy dispersive spectroscopy(EDS), electron backscattering diffraction (EBSD) and other means. The macroscopic observation of the weld shows that there are holes on the front and back of the weld and burrs on the front of the weld. With the increase of the rotation speed/welding speed ratio, the holes disappear and burrs increase. Tensile test results show that there are three failure modes: defect fracture at the hole location at 300 r/min-100 mm/min, Al/Fe interface fracture at 300 r/min-80/60 mm/min and Al matrix fracture at 400/500/600 r/min-100 mm/min. In this experiment, the maximum welding efficiency of the three modes is 40.1%, 41.0% and 60.4%, respectively, among which the welding efficiency of Al matrix fracture mode is the highest. The hole in the weld zone reduces the joint strength and leads to defect fracture. At the low rotation speed of 300 r/min, the interface fails to achieve effective metallurgical bonding, and the interface strength is lower than the Al matrix strength, leading to the fracture of the Al/Fe interface. The hardness test results show that the hardness of aluminum side decreases first and then increases, and the lowest point of hardness appears in the heat-affected zone 6-7 mm away from the Al-Fe interface, corresponding to the fracture position of Al matrix. With the increase of rotation speed, the interface strength is higher than Al matrix, leading to the fracture of Al matrix. |
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| Keywords: | aluminum/iron dissimilar metals friction stir welding failure mode metallurgical bonding mechanical properties |
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