转速对5A06铝/1Cr18Ni9Ti钢填丝搅拌摩擦焊接头组织及性能的影响  

Influence of Rotational Speed on the Microstructure and Properties of 5A06Aluminum/1Cr18Ni9Ti Steel Filler Metal Friction Stir Welded Joints

作　　者：韩亚洲 刘骞 黎帮金 方皓 杨栋华[1,2] 许惠斌[1,2] Han Yazhou;Liu Qian;Li Bangjin;Fang Hao;Yang Donghua;Xu Huibin(School of Materials Science and Engineering,Chongqing University of Technology,Chongqing 400054;Chongqing Municipal Engineering Research Center of Institutions of Higher Education for Special Welding Materialand Technology,Chongqing University of Technology,Chongqing 400054)

机构地区：[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

出　　处：《航天制造技术》2023年第4期40-45,共6页Aerospace Manufacturing Technology

基　　金：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)。

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。To achieve lightweight production,the use of aluminum alloy instead of steel to fabricate aluminum/steelhybrid joints represents an effective measure for structural lightweighting.However,this requires addressing the inherentwelding challenges associated with dissimilar materials such as aluminum and steel.This study investigates the jointperformance of aluminum/steel dissimilar metal friction stir welding(FSW)under varying rotational speeds.The resultsreveal that an increased rotational speed initially enhances and subsequently reduces the strength of the welded joint.Ata rotational speed of 150r/min,a primarilyβ-FeAl phase intermetallic compound(IMC)layer,with a minimum thicknessof 0.35μm,forms at the interface.The predominant IMC particles at the interface belong to the orthorhombicε-Al3Niphase.The average tensile strength of the aluminum/steel butt joint reaches 250MPa.Fractured joints displaycharacteristics of ductile fracture.

关 键 词：铝/钢 异种金属 搅拌摩擦焊 金属间化合物 

分 类 号：V261[航空宇航科学与技术—航空宇航制造工程]