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转速对5A06铝/1Cr18Ni9Ti钢填丝搅拌摩擦焊
接头组织及性能的影响 |
韩亚洲1,刘 骞1,黎帮金1,方 皓1,杨栋华1,2,许惠斌1,2
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1. 材料科学与工程学院,重庆理工大学,重庆 400054;2. 特种焊接材料与技术重庆市工程研究中心,重庆理工大学,重庆 400054
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摘要: |
采用铝合金替代钢材制造是一种有效的结构轻量化措施,然而解决铝/钢异种金属的高质量高可靠焊接问题成为工程领域的重要难题。本文采用填丝搅拌摩擦焊(FSW),研究不同转速对铝/钢异种金属的接头组织与性能的影响规律。结果表明,随着转速的提高,焊接接头的强度呈先增强后减弱的趋势。在转速为150r/min时,界面主要生成了厚度约为0.35μm的β-FeAl金属间化合物(IMC)层,焊缝中主要的IMC颗粒为正交晶系的ε-Al3Ni相,铝/钢对接接头的平均抗拉强度达到了250MPa,且断口表现为韧性断裂。 |
关键词: 铝/钢;异种金属;搅拌摩擦焊;金属间化合物 |
基金项目:重庆市自然科学基金面上项目(cstc2021j***-***mX0391);重庆市巴南区科技成果转化及产业化
专项资助项目(202****010);重庆理工大学国家自然科学基金项目培育计划资助项目(202****013) |
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Influence of Rotational Speed on the Microstructure and Properties of 5A06 Aluminum/1Cr18Ni9Ti Steel Filler Metal Friction Stir Welded Joints |
Han Yazhou1, Liu Qian1, Li Bangjin1, Fang Hao1, Yang Donghua1,2, Xu Huibin1,2
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1. School of Materials Science and Engineering, Chongqing University of Technology, Chongqing 400054;2. Chongqing Municipal Engineering Research Center of Institutions of Higher Education for Special Welding Material and Technology, Chongqing University of Technology, Chongqing 400054
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Abstract: |
To achieve lightweight production, the use of aluminum alloy instead of steel to fabricate aluminum/steel hybrid joints represents an effective measure for structural lightweighting. However, this requires addressing the inherent welding challenges associated with dissimilar materials such as aluminum and steel. This study investigates the joint performance of aluminum/steel dissimilar metal friction stir welding (FSW) under varying rotational speeds. The results reveal that an increased rotational speed initially enhances and subsequently reduces the strength of the welded joint. At a rotational speed of 150r/min, a primarily β-FeAl phase intermetallic compound (IMC) layer, with a minimum thickness of 0.35μm, forms at the interface. The predominant IMC particles at the interface belong to the orthorhombic ε-Al3Ni phase. The average tensile strength of the aluminum/steel butt joint reaches 250MPa. Fractured joints display characteristics of ductile fracture. |
Key words: aluminum/steel;dissimilar metals;friction stir welding;intermetallic compound |