| 引用本文: | 柳泉潇潇,夏泽华,崔俊佳,李光耀.高低温循环试验下磁脉冲焊接接头性能研究[J].材料科学与工艺,2018,26(5):19-25.DOI:10.11951/j.issn.1005-0299.20170416. |
| LIU Quanxiaoxiao,XIA Zehua,CUI Junjia,LI Guangyao.Properties of magnetic pulse welded joints at high and low temperature cycling experiments[J].Materials Science and Technology,2018,26(5):19-25.DOI:10.11951/j.issn.1005-0299.20170416. |
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| 摘要: |
| 磁脉冲焊接是一种高效的固相焊接工艺，对异种金属材料在汽车轻量化中的运用具有积极意义.通过对5052Al/HC420LA板件磁脉冲焊接接头进行不同条件下的高低温循环试验，对比焊接接头在高低温循环试验前后的力学性能变化，研究了高低温循环冷却方式、循环次数对焊接接头性能的影响.利用扫描电子显微镜(SEM)研究了焊接接头微观形貌特征，分析了高低温循环试验前后焊缝微观界面的特征及其变化.研究表明：不同高低温循环试验条件下5052Al-HC420LA铝-钢磁脉冲焊接接头的连接强度相比于5052铝合金的母材强度下降了5%~25%；冷却速度越快，高低温循环次数越多，接头力学性能下降越明显；接头在高低温循环试验前后出现了母材失效与焊缝失效两种剪切失效模式；水冷冷却的接头比空冷冷却更易产生微观裂纹.
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| 关键词: 磁脉冲焊接 汽车轻量化 高低温循环 异种金属材料 微观 |
| DOI：10.11951/j.issn.1005-0299.20170416 |
| 分类号:TG407 |
| 文献标识码:A |
| 基金项目:国家自然科学基金资助项目(4,9)；国家新能源汽车重大专项项目(2016YFB0101704)；湖南省重点研发计划项目(2017GK2090). |
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| Properties of magnetic pulse welded joints at high and low temperature cycling experiments |
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LIU Quanxiaoxiao1, XIA Zehua1, CUI Junjia1,2, LI Guangyao1,2
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(1. State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body(Hunan University), Changsha 410082,China;2.Joint Centre for Intelligent New Energy Vehicles, Shanghai 201804,China)
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| Abstract: |
| Magnetic pulse welding is a kind of efficient solid-state welding process, which is positive for the application of dissimilar metal materials in automobile lightening. In this paper, high and low temperature cycling experiments were carried out under different conditions for 5052Al/HC420LA plate magnetic pulse welding joints. Comparing with the mechanical properties of welded joints before and after high and low temperature cycling experiments, the effects of cooling modes and cyclic numbers on the properties of welding joints were studied. The micro-structure of welded joints was studied by SEM, and characteristics and changes of micro-interface features before and after high and low temperature cycling experiments were compared. The results show that the connection strength of the 5052Al-HC420LA magnetic pulse welded joints were reduced by 5% ~ 25% under different conditions compared to the strength of 5052 aluminum alloy base metal. Moreover, the mechanical property of the joint decreased with the increase of cooling rate and cycling numbers. Two shearing failure modes(failure of base metal and failure of welding seam)were obtained before and after high and low temperature cycling experiments. Water-cooled cooling joints were more likely to produce microscopic cracks than air-cooled cooling.
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| Key words: magnetic pulse welding automobile lightening high and low temperature cycling dissimilar metal materials microstructure |
