铝/钢异种金属焊接过程中金属间化合物演化过程的相场研究  

Phase Field Study of Intermetallic Compound Evolution during Aluminum/Steel Dissimilar Metal Welding

作　　者：唐紫聪 李敏 杨洪刚 陈云霞[2] TANG Zicong;LI Min;YANG Honggang;CHEN Yunxia(School of Energy and Mechanical Engineering,Shanghai University of Electric Power,Shanghai 201306,China;School of Mechanical Engineering,Shanghai Dianji University,Shanghai 201306,China)

机构地区：[1]上海电力大学能源与机械工程学院,上海201306 [2]上海电机学院机械学院,上海201306

出　　处：《热加工工艺》2025年第5期117-120,126,共5页Hot Working Technology

基　　金：国家自然科学基金项目(51809161,52005315)。

摘　　要：采用双椭球热源模型结合相场模型,模拟铝/钢异种金属焊接过程中的温度场以及金属间化合物(IMC)的生长行为,IMCs由Fe_(2)Al_(5)和FeAl_(3)组成,且Fe_(2)Al_(5)占据了IMC层的主要部分。结果表明:Fe_(2)Al_(5)首先形成,然后少量Fe原子与Al原子结合生成FeAl_(3)。Fe_(2)Al_(5)的枝晶之间由于溶质的大量聚集形成溶质偏析,导致焊接接头的力学性能降低。Fe_(2)Al_(5)的枝晶臂间距和厚度随焊接电流的减小而减小,这可以有效地改善铝/钢焊接接头的力学性能。The double ellipsoidal heat source model combined with the phase field model was used to simulate the temperature field and the growth behavior of the intermetallic compounds(IMC)in the process of aluminum/steel dissimilar metal welding.The IMCs are composed of Fe_(2)Al_(5)and FeAl_(3),and Fe_(2)Al_(5)occupies the main part of the IMC layer.The results show that Fe_(2)Al_(5)is formed at first,then a small amount of Fe atoms combine with Al atoms to form FeAl_(3).Solute segregation is formed between the dendrites of Fe_(2)Al_(5)due to a large amount of solute aggregation,which leads to the reduction of mechanical properties of the welded joint.The dendrite arm spacing and thickness of Fe_(2)Al_(5)decrease with the decrease of welding current,which can effectively improve the mechanical properties of the aluminum/steel welded joint.

关 键 词：相场法 铝/钢异种金属 金属间化合物 溶质偏析 

分 类 号：TG407.1[金属学及工艺—焊接]