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材料导报  2021, Vol. 35 Issue (18): 18136-18140    https://doi.org/10.11896/cldb.20080306
  金属与金属基复合材料 |
添加Ni中间层镁/钢激光熔钎焊接头的组织和性能
戎易1, 王德1, 陈益平1, 熊震宇1, 程东海1, 胡德安1, 邹鹏远2, 刘钊泽1
1 南昌航空大学航空制造工程学院,南昌 330063
2 南昌航空大学科技学院,九江 332020
Study on Microstructure and Properties of Magnesium/Steel Laser Welding-brazing Joint with Ni Intermediate Layer
RONG Yi1, WANG De1, CHEN Yiping1, XIONG Zhenyu1, CHENG Donghai1, HU De'an1, ZOU Pengyuan2, LIU Zhaoze1
1 School of Aeronautical Manufacturing Engineering, Nanchang Hangkong University, Nanchang 330063, China
2 College of Science and Technology, Nanchang Hangkong University, Jiujiang 332020, China
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摘要 通过添加0.1 mm的Ni片,对AZ31B镁合金板和Q235低碳钢进行激光熔钎焊搭接试验,分析添加Ni中间层后接头的宏观形貌、元素分布与微观组织和力学性能。结果表明:添加Ni中间层的熔钎焊接头焊缝成形良好。焊缝由镁侧焊缝、金属间化合物(IMC)层、钢侧焊缝组成。根据元素分布发现,加入Ni中间层后,在IMC层出现Mg元素向下、Fe元素向上扩散的现象。进一步研究发现,接头镁侧焊缝主要由α-Mg+β-Mg17-Al12)组成;IMC层由Mg2Ni、AlNi相和(α-Mg+Mg2Ni)共晶组织组成;钢侧焊缝由Fe-Ni固溶体组成。其中,IMC层中的树枝状的Mg2Ni有机械咬合的作用,AlNi相对熔钎焊接头具有强化作用,使接头的力学性能提高。随着线能量的增加,接头拉剪强度σb呈现出先增大后减小的趋势。当P=1 250 W、v=20 mm·s-1、线能量Q=625 J·cm-1时,添加Ni中间层的镁/钢焊接头的σb最高,达到198 MPa。
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戎易
王德
陈益平
熊震宇
程东海
胡德安
邹鹏远
刘钊泽
关键词:  激光熔钎焊  IMC层  机械咬合  强化作用    
Abstract: Laser welding-brazing lap joint test of AZ31B magnesium alloy plate and Q235 low carbon steel was carried out by adding 0.1 mm Ni sheet. The macroscopic morphology, element distribution, microstructure and mechanical properties of the joints were analyzed after adding Ni intermediate layer. The results showed that the welding-brazing joint with Ni intermediate layer was well formed. The weld consists of a Mg side weld zone, an intermetallic compound (IMC) layer, and a steel side weld zone. According to the element distribution, the addition of Ni intermediate layer resulted in the phenomenon of Mg element downward and Fe element upward diffusion in the IMC layer. Further study revealed that the Mg side weld zone of the joint was mainly composed of α-Mg+β-Mg17Al12. The IMC layer is composed of Mg2Ni, AlNi phase and (α-Mg +Mg2Ni)eutectic structure. The steel side weld zone was composed of Fe-Ni solid solution. The dendritic Mg2Ni in the IMC layer achieved a certain mechanical bite effect. At the same time, AlNi phase has a strengthening effect on the welding-brazing joint, which enhances the mechanical properties of the joint. With the increase of energy input, the tensile shear strength tends to increase first and then decrease. When P=1 250 W, V=20 mm·s-1, energy input Q=625 J·cm-1, the tensile-shear strength of magnesium steel joint with Ni intermediate layer was the highest, reaching 198 MPa.
Key words:  laser welding-brazing    IMC layer    mechanical interlocking    strengthening effect
               出版日期:  2021-09-25      发布日期:  2021-09-30
ZTFLH:  TG442  
基金资助: 国家自然科学基金(51965045);江西省自然科学基金(20202ACBL214003);南昌航空大学博士启动基金(2030009401073)
作者简介:  熊震宇,1968年11月生,中共党员,教授、博士、硕士研究生导师、江西省中青年骨干教师,江西省机械工程学会副理事长,江西省焊接学会副理事长。主要从事焊接机器人与自动化、焊接质量控制的研究工作。主持或参与国家“863”计划项目2项,国家自然科学基金项目2项,省部级项目多项。现任南昌航空大学副校长。
引用本文:    
戎易, 王德, 陈益平, 熊震宇, 程东海, 胡德安, 邹鹏远, 刘钊泽. 添加Ni中间层镁/钢激光熔钎焊接头的组织和性能[J]. 材料导报, 2021, 35(18): 18136-18140.
RONG Yi, WANG De, CHEN Yiping, XIONG Zhenyu, CHENG Donghai, HU De'an, ZOU Pengyuan, LIU Zhaoze. Study on Microstructure and Properties of Magnesium/Steel Laser Welding-brazing Joint with Ni Intermediate Layer. Materials Reports, 2021, 35(18): 18136-18140.
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http://www.mater-rep.com/CN/10.11896/cldb.20080306  或          http://www.mater-rep.com/CN/Y2021/V35/I18/18136
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