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Study on the microstructure and mechanical performance for integrated resistance element welded aluminum alloy/press hardened steel joints

机译：集成电阻元件焊接铝合金微观结构和力学性能研究/压力钢结构

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摘要

Resistance element welding (REW) is a recently developed hybrid joining process for aluminum (Al)/steel dissimilar materials. In this study, the microstructure and mechanical performance of the Al/press hardened steel (PHS) joints generated using an integrated REW process were investigated. The microstructure of fusion zone (FZ) between rivet and PHS was lath martensite, which was transformed from the fast cooling of austenite. The Al could be divided into four zones according to the microstructure and microhardness distribution: re-solidified zone (RZ), softening zone (SZ), transition zone (TZ) and base metal (BM). The dissolution and coarsening of the precipitates are responsible for the hardness reduction of Al sheet. The variation of mechanical performance was explained in light of the increasing FZ size and the softening Al sheet as heat input rising. Moreover, four block shear models were introduced to predict the peak load of REW joints using the average hardness of SZ in Al sheet, among which the models from Architectural Institute of Japan (AIJ) provided a relatively good prediction. Considering both the average hardness of SZ and sheet thickness, an analytical model was established to predict the variation of critical nugget sizes and explain the failure mode transition.
机译：电阻元件焊接（REW）是最近开发的铝（Al）/钢异常材料的混合连接过程。在该研究中，研究了使用集成卷曲过程产生的Al /压力硬化钢（PHS）接头的微观结构和机械性能。铆钉和pHS之间的融合区（FZ）的微观结构是Lath马氏体，从奥氏体的快速冷却转化。根据微观结构和微硬度分布，Al可以分成四个区域：重新固化区域（RZ），软化区（SZ），过渡区（TZ）和贱金属（BM）。沉淀物的溶解和粗化对Al板材的硬度降低负责。根据增加的FZ尺寸和软化Al片材作为热输入上升，解释了机械性能的变化。此外，引入了四种块剪切模型以预测使用Al板中Sz的平均硬度的REW关节的峰值负荷，其中日本建筑研究所（AIJ）的模型提供了相对良好的预测。考虑到Sz和板材厚度的平均硬度，建立了分析模型，以预测关键掘金尺寸的变化并解释失败模式转换。

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  • 来源
    《Materials Science and Engineering》 |2021年第7期|140329.1-140329.11|共11页
  • 作者

    Sizhe Niu; Ming Lou; Yunwu Ma; Yongbing Li;

  • 作者单位

    Shanghai Key Laboratory of Digital Manufacture for Thin-walled Structures School of Mechanical Engineering Shanghai Jiao Tong University Shanghai 200240 PR China State Key Laboratory of Mechanical System and Vibration Shanghai Jiao Tong University Shanghai 200240 PR China;

    Shanghai Key Laboratory of Digital Manufacture for Thin-walled Structures School of Mechanical Engineering Shanghai Jiao Tong University Shanghai 200240 PR China State Key Laboratory of Mechanical System and Vibration Shanghai Jiao Tong University Shanghai 200240 PR China;

    Joining and Welding Research Instute Osaka University 11-1 Mihogaoka Ibaraki Osaka 567-0047 Japan;

    Shanghai Key Laboratory of Digital Manufacture for Thin-walled Structures School of Mechanical Engineering Shanghai Jiao Tong University Shanghai 200240 PR China State Key Laboratory of Mechanical System and Vibration Shanghai Jiao Tong University Shanghai 200240 PR China;

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

    Integrated resistance element welding; Al/steel dissimilar materials; Peak load prediction; Failure mode transition;

    机译：集成电阻元件焊接;Al /钢异种材料;峰值负荷预测;失败模式过渡;

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