铝/钢激光-感应加热复合熔钎焊工艺与组织性能研究  

Mechanical Properties and Microstructure of Dissimilar Laser-induction Heating Hybrid Braze-welding of Al Alloy to Steel

作　　者：吴凌清 杨瑾 应纯志 叶欣 王非凡 张华 Wu Lingqing;Yang Jin;Ying Chunzhi;Ye Xin;Wang Feifan;Zhang Hua(School of Materials Engineering,Shanghai University of Engineering Science,Shanghai 201620;Beijing Institute of Astronautical Systems Engineering,Beijing 100076;Shanghai Collaborative Innovation Center of Intelligent Manufacturing Robot Technology for Large Components,Shanghai 201620)

机构地区：[1]上海工程技术大学材料科学与工程学院,上海201620 [2]北京宇航系统工程研究所,北京100076 [3]上海大型构件智能制造机器人技术协同创新中心,上海201620

出　　处：《航天制造技术》2024年第6期10-15,共6页Aerospace Manufacturing Technology

基　　金：国家自然科学基金(522***55、522***95)。

摘　　要：随着运载火箭结构轻量化发展,部分传统的钢结构逐渐被铝合金等轻质材料取代,这就涉及到铝/钢异种金属连接技术。为了获得高质量的铝/钢异质接头,利用自主研发的激光-感应加热复合焊接平台,开展了铝合金/不锈钢激光熔钎焊工艺试验。借助扫描电镜(SEM)、能谱分析仪(EDS)等分析手段,对比研究了有无感应加热条件下,铝/钢接头的宏观形貌、显微组织和力学性能。研究结果表明,感应加热能提高激光熔钎焊过程Zn-Al钎料在不锈钢表面的润湿铺展性增加了钎焊宽度,并促进了界面金属间化合物的生长;此外,感应加热提高了接头力学性能,单位长度拉伸载荷由189.8N/mm增加到267.2N/mm,接头断裂形式由界面附近的脆性断裂变化为熔合线附近的韧性断裂。With the development of lightweight launch vehicle structure,part of the traditional steel structure has been gradually replaced by aluminum alloy and other lightweight materials,which involves Al/Steel dissimilar joint technology.To obtain high-quality Al/Steel dissimilar joints,the self-developed laser-inductive heating composite welding platform was used to carry out the Al/steel laser braze-welding process experiment.With the help of a scanning electron microscope(SEM),energy spectrum analyzer(EDS),and other analytical means,the macroscopic morphology,microstructure,and mechanical properties of the aluminum/steel joints were comparatively studied with and without induction heating.The results show that induction heating can improve the wetting and spreading of Zn-Al brazing material on the surface of stainless steel which improved the brazing width and promote the growth of intermetallic compounds at the interface in the process of laser brazing welding;moreover,induction heating improves the mechanical properties of the joint,which are increased from 189.8 N/mm to 267.2 N/mm,and the form of fracture of the joint is changed from the brittle fracture near the interface to the ductile fracture near the fusion line.

关 键 词：感应加热 异种接头 激光焊接 微观组织 

分 类 号：TG454[金属学及工艺—焊接] V19[航空宇航科学与技术—人机与环境工程]