冷喷镍中间层铝/钢电阻点焊接头组织及力学性能

详细信息    查看全文 | 推荐本文 |

英文篇名：Microstructure and Mechanical Properties of Cold Spraying Ni Interlayer Al/Steel Resistance Spot Welding Joints 作者：郭芮岐 ; 张勇 ; 翁福娟 ; 杨康 英文作者：GUO Ruiqi;ZHANG Yong;WENG Fujuan;YANG Kang;Shaanxi Key Laboratory of Friction Welding Technologies, Northwestern Polytechnical University; 关键词：焊接 ; 铝合金 ; 双相钢 ; 冷喷涂层 ; 微观组织 ; 金属间化合物 英文关键词：welding;;Al alloy;;duplex steel;;cold spray coating;;microstructure;;intermetallic compound 中文刊名：HGZZ 英文刊名：Welded Pipe and Tube 机构：西北工业大学陕西省摩擦焊接工程技术重点实验室; 出版日期：2019-05-28 出版单位：焊管 年：2019 期：v.42;No.283 基金：国家自然科学基金资助项目“高强铝合金点焊微裂纹的智能预测与多场诱导愈合机理研究”(项目编号51275418) 语种：中文; 页：HGZZ201905004 页数：6 CN：05 ISSN：61-1160/TE 分类号：24-29

摘要

针对6061-T6铝合金和DP600双相钢的电阻点焊,焊前采用冷喷涂方法在铝合金母材待焊表面制备镍中间层,焊接时在电极和铝合金间添加低碳钢板辅助工艺垫片。借助金相显微镜、扫描电子显微镜、能谱仪和万能试验机,研究了点焊接头的组织、力学性能及镍层的作用机理。结果表明,接头界面明显,铝合金侧和钢侧分别形成了鼓状和椭圆形熔核。铝合金侧熔核近熔核线区为树枝晶,熔核中心为等轴晶;双相钢侧热影响区为马氏体和铁素体,熔核中心为较粗大的板条状马氏体。镍中间层可在一定程度上阻止焊接过程中Al-Fe的互扩散,抑制Al-Fe金属间化合物的形成,界面金属间化合物层厚度小于2μm,接头平均拉剪力达5.17 kN。
        For the resistance spot welding of 6061-T6 aluminum alloy and DP600 duplex steel, the Ni interlayer was prepared on the surface of Al alloy base material to be welded by cold spraying method before welding, and low carbon steel plate auxiliary process gasket was added between the electrode and aluminum alloy during welding. The microstructure and mechanical properties of spot welding joints and the action mechanism of Ni layer were studied by metalloscope, scanning electron metalloscope, energy disperse spectroscopy and universal testing machine. The results showed that the interface of the joint was obvious, and the Al alloy side and the steel side had formed the bulging and oval nugget respectively. Dendrites were found near melting line of nugget on the side of Al alloy, and equiaxed crystals are found in the nugget center; martensite and ferrite were found in the heat affected zone on the side of the biphasic steel, and massive lath martensites were found in the nugget center. The Ni interlayer could prevent the interdiffusion of Al-Fe to some extent during the welding process, inhibit the formation of intermetallic compounds of Al-Fe. The intermetallic compound layer thickness was less than 2 μm, and the average tensile shear force of the joints was up to 5.17 kN.

引文

[1]李永兵,马运五,楼铭,等.轻量化多材料汽车车身连接技术进展[J].机械工程学报, 2017, 52(24):1-23.
    [2] SCHUBERT E, KLASSEN M, ZERNER I, et al. Light-weight structures produced by laser beam joining for future applications in automobile and aerospace industry[J]. Journal of Materials Processing Tech, 2001, 115(1):2-8.
    [3] QIU R F, IWAMOTO C, SATONAKA S. Interfacial reaction layer in resistance spot welded joint between aluminum alloy and austenitic stainless steel[J]. Materials Science and Technology, 2010, 26(2):243-246.
    [4]张伟华.铝合金/高强钢异种金属电阻点焊研究[D].长春:吉林大学, 2011.
    [5] MANLADAN S M, YUSOF F, RAMESH S, et al. A review on resistance spot welding of aluminum alloys[J].The International Journal of Advanced Manufacturing Technology, 2016, 90(1-4):605-634.
    [6]张月莹,孙大千,李洪梅,等. Cu对铝/钢异种金属电阻点焊接头组织及性能的影响[J].长春工业大学学报, 2017,38(1):8-13.
    [7] SUN X, STEPHENS E V, KHALEEL M A, et al. Resistance spot welding of aluminum alloy to steel with transition material[J]. Welding Journal, 2004, 83(6):188-195.
    [8] ASSADI H, KREYE H, GARTNER F, et al. Cold spraying-A materials perspective[J]. Acta Materialia, 2016(116):382-407.
    [9] WINNICKI M, MALACHOWSKA A, KORZENIOWSKI M,et al. Aluminium to steel resistance spot welding with cold sprayed interlayer[J]. Surface Engineering, 2017, 34(3):235-242.
    [10]НП梁基谢夫.金属二元系相图手册[M].郭青蔚译.北京:化学工业出版社, 2009.
    [11]宋建岭,林三宝,杨春利,等.合金元素改善铝/钢异种金属接头性能的研究[J].航空制造技术, 2008(12):26-28.
    [12]崇玉良.汽车用钢与铝合金电阻点焊机理研究[D].上海:上海交通大学, 2012.
    [13]侯增寿.实用三元合金相图[M].上海:上海科学技术出版社, 1983.
    [14]吕学勤,吴毅雄,张庆云. Al-不锈钢连接中的Ni层阻碍机理[J].上海交通大学学报, 2003, 37(2):164-166.
    [15]赵磊,孙勇,李玉阁,等.微合金化元素对Fe-A1界面结合的第一性原理研究[J].原子与分子物理学报,2007, 24(4):853-857.