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.
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)
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)。
关键词
感应加热
异种接头
激光焊接
微观组织
induction heating
dissimilar joints
laser braze-welding
microstructure
