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首页> 外文期刊>Materials Science and Engineering >Microstructure, tensile and fatigue properties of ultrasonic spot welded aluminum to galvanized high-strength-low-alloy and low-carbon steel sheets
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Microstructure, tensile and fatigue properties of ultrasonic spot welded aluminum to galvanized high-strength-low-alloy and low-carbon steel sheets

机译：超声点焊铝对镀锌高强度低合金和低碳钢板的组织，拉伸和疲劳性能

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摘要

The microstructure evolution, tensile lap shear strength and fatigue properties of dissimilar ultrasonic spot welded (USWed) joints of aluminum to two commercial steel sheets at different welding energies were investigated. The main intermetallics at the weld interface were θ (FeAl_3) in both joints along with eutectic Al-Zn in Al-to-galvanized high-strength-low-alloy (HSLA) steel joints and Fe_3Al in Al-to-ASTM A36 steel joints. The welding strengths of both joints were higher than those of other dissimilar joints reported in the literature. With increasing welding energy, the maximum tensile lap shear strength increased in the Al-to-galvanized HSLA steel joints, while the lap shear strength increased up to a peak value and then decreased in the Al-to-ASTM A36 steel joints. Both the average peak welding strength and fracture energy of the Al-to-galvanized HSLA steel joints were higher than those of the Al-to-ASTM A36 steel joints. The fatigue lives of both welded joints were in agreement with or somewhat longer than other Al-to-steel USWed joints in the literature. The fatigue fracture mode changed with increasing cyclic loads in both welded joints. Fatigue crack growth was mainly characterized by the formation of fatigue striations perpendicular to the fatigue crack propagation direction.
机译：研究了铝与两种商业钢板在不同焊接能量下的异种超声点焊（USWed）接头的组织演变，拉伸搭接剪切强度和疲劳性能。焊接界面的主要金属间化合物是两个接头的θ（FeAl_3）以及铝到镀锌的高强度低合金（HSLA）钢接头中的共晶Al-Zn，以及铝到ASTM A36钢接头中的Fe_3Al。 。两种接头的焊接强度均高于文献报道的其他异种接头。随着焊接能量的增加，Al-镀锌HSLA钢接头的最大抗拉搭接剪切强度增加，而Al-ASTM A36钢接头的搭接抗剪强度增加到峰值，然后下降。 Al-镀锌HSLA钢接头的平均峰值焊接强度和断裂能均高于Al-ASTM A36钢接头的平均峰值焊接强度和断裂能。两种焊接接头的疲劳寿命与文献中的其他铝对钢USWed接头一致或更长。疲劳断裂模式随两个焊接接头中循环载荷的增加而变化。疲劳裂纹扩展的主要特征是垂直于疲劳裂纹扩展方向的疲劳条纹的形成。

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  • 来源
    《Materials Science and Engineering》 |2017年第6期|323-336|共14页
  • 作者

    F.A. Mirza; A. Macwan; S.D. Bhole; D.L. Chen; X.-G. Chen;

  • 作者单位

    Department of Applied Sciences, University of Quebec at Chicoutimi 555, boulevard de l'Universite, Chicoutimi, QC, Canada G7H 2B1;

    Department of Mechanical and Industrial Engineering, Ryerson University, 350 Victoria Street, Toronto, Ontario, M5B 2K3, Canada;

    Department of Mechanical and Industrial Engineering, Ryerson University, 350 Victoria Street, Toronto, Ontario, M5B 2K3, Canada;

    Department of Mechanical and Industrial Engineering, Ryerson University, 350 Victoria Street, Toronto, Ontario, M5B 2K3, Canada;

    Department of Applied Sciences, University of Quebec at Chicoutimi 555, boulevard de l'Universite, Chicoutimi, QC, Canada G7H 2B1;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Dissimilar ultrasonic spot welding; Tensile lap shear strength; Fatigue life and fracture; Aluminum alloy; Steel alloy; Interface microstructure;

    机译：异种超声波点焊;拉伸搭接剪切强度;疲劳寿命和断裂;铝合金;钢合金;界面微观结构;

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