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| 6061铝合金/DP600钢电阻点焊接头特征及力学性能 |
| Interfacial Characteristics and Mechanical Property of Resistance Spot Welded 6061-T6/DP600 Joint |
| Received:November 20, 2023 |
| DOI：10.3969/j.issn.1674-6457.2024.02.016 |
| 中文关键词: 6061-T6铝合金 DP600双相钢 电阻点焊 组织特征 力学性能 |
| 英文关键词: 6061-T6 alloy DP600 duplex steel resistance spot welding microstructure mechanical properties |
| 基金项目:国家自然科学基金(51275418) |
| Author Name | Affiliation | | ZHAO Hongguang | Bus Research Institute, Zhongtong Bus Co., Ltd., Shandong Liaocheng 252000, China | | WENG Fujuan | Key Laboratory of Friction Welding Engineering Technology of Shaanxi Province, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an 710072, China | | ZHANG Yong | Key Laboratory of Friction Welding Engineering Technology of Shaanxi Province, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an 710072, China |
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| 中文摘要: |
| 目的 提升6061-T6铝合金/DP600双相钢电阻点焊接头的力学性能，以满足该焊接结构在汽车工业中的应用。方法 对6061-T6铝合金与DP600双相钢分别进行了直接电阻点焊试验及添加Ni中间层的电阻点焊试验，采用光学显微镜、扫描电子显微镜及能谱仪分析了接头界面宏微观组织、化学成分、元素分布等，此外还采用接头拉剪试验进行了2种接头的力学性能测试，并对接头的断口形貌及断裂模式进行了分析。结果 直接点焊接头熔核界面形成了厚度约为2.5 μm的金属间化合物层，主要金属间化合物为靠近铝合金侧的Fe2Al5及靠近高强钢侧的Fe4Al13。直接点焊接头的拉剪载荷为3.1 kN，失效形式为界面断裂，断口呈以脆性为主的混合断裂特征。添加Ni中间层的点焊接头界面形成了Ni4Al13、Ni2Al5金属间化合物，抑制了焊接过程中Al-Fe互扩散并降低了Al-Fe金属间化合物的形成以及硬脆性Al-Fe金属间化合物对接头力学性能的影响，使接头拉剪载荷提高了67.7%，达到了5.2 kN，断口呈以韧性为主的混合断裂特征。结论 添加Ni中间层可显著提升6061-T6铝合金/DP600双相钢电阻点焊接头的力学性能。 |
| 英文摘要: |
| The work aims to improve the improve the mechanical property of resistance spot welded joints of 6061-T6 aluminum alloy/DP600 duplex steel to meet its engineering application requirements in automobile industry. The resistance spot welding experiments of 6061-T6 aluminum alloy and DP600 duplex steel with Ni interlayer and without interlayer were conducted. The interfacial microstructure evolution, chemical component and elements distribution of joints were investigated with a scanning electron microscope combined with an energy disperse spectroscopy. In addition, the interfacial tensile shear properties of joints were also measured. The fracture morphology and fracture mode of the joints were analyzed. Results showed that an intermetallic compound layer with a thickness of about 2.5 μm was formed at the interface of the joint without interlayer, which was composed of Fe2Al5 bear the Al alloy side and Fe4Al13 near the high strength steel side. The tensile shear strength of the joint without interlayer was 3.1 kN, and its failure mode was mainly interfacial fracture. The fracture was characterized by brittle mixed fracture. However, an intermetallic compound layer composed of Ni4Al13 and Ni2Al5 was formed at the interface of the joint with Ni interlayer, which limited the diffusion of Al-Fe and the formation of brittle Al-Fe intermetallic compounds during welding, resulting in tensile shear strength of this joint increasing 67.7% (5.2 kN). The fracture was characterized by tough mixed fracture. It can be concluded that Ni interlayer is able to increase the mechanical properties of resistance spot welded 6061-T6 aluminum alloy/DP600 steel joints. |
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