LD2铝合金与不锈钢惯性摩擦焊及高低温循环试验  

LD2 Al alloy and stainless steel inertia friction welding and high/low temperature cycling tests

作　　者：赵衍华 张丽娜 蔡菁青 王炜 郭盛斌 沈岩 ZHAO Yanhua;ZHANG Lina;CAI Jingqing;WANG Wei;GUO Shengbin;SHEN Yan(Capital Aerospace Machinery Corporation,Beijing,100076,China)

机构地区：[1]首都航天机械有限公司,北京100076

出　　处：《焊接学报》2023年第8期123-128,I0010,共7页Transactions of The China Welding Institution

摘　　要：采用惯性摩擦焊实现了LD2铝合金/0Cr18Ni9不锈钢异种金属的高质量连接,通过焊后加工的方式获得接头强度可达铝合金母材的96%.对获得的优质铝/钢接头进行工艺研究,对比分析了高低温循环试验前后接头界面组织、密封性、承压力及硬度等性能.结果表明,采用优化焊接工艺可获得无缺陷铝/钢异种金属焊接接头,界面金属间化合物层厚度约为500~600 nm,且分布均匀、连续;焊接接头发生了元素扩散,界面形成了富硅的FeAl_(x)相;接头断裂形式以韧性断裂为主的混合断裂;密封性和承压能力良好;高低温循环试验后的接头界面显微组织、密封性和承压能力基本无变化;高温循环后,时效强化导致铝合金侧的硬度值较初始和低温状态提升约10%.The sound LD2 Al alloy/0Cr18Ni9 stainless steel dissimilar metal joint was achieved by inertia friction welding.The joint strength after post-welding processing could reach 96%of that of the aluminum alloy base metal.The process study was conducted on the sound Al/steel joint.The interface microstructure,tightness,pressure-bearing capacity,and the hardness of the joints before and after the high/low-temperature were comparatively analyzed.The results show that the optimized welding process can obtain defect-free Al/steel dissimilar metal joints.The distribution of the interface intermetallic compounds(IMCs)layer was uniform and continuous,with the thickness of about 500~600 nm.The element diffusion was observed at the joint interface,with the generation of Si rich FeAl_(x) phase.The joint fracture type was the mixed fracture dominated by ductile fracture.The joints showed sound tightness and pressure-bearing capacity.After the high/low temperature cycling tests,the interface microstructure,tightness,and pressure-bearing capacity of the joints were barely changed.Compared with the initial joints and the joints after the low temperature cycling test,the hardness of LD2 Al alloy increased by about 10%due to aging strengthening.

关 键 词：LD2铝合金 异种金属 惯性摩擦焊 高低温循环试验 

分 类 号：TG453.9[金属学及工艺—焊接]