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首页> 外文期刊>Materials & design >Effect of humidity on porosity, microstructure, and fatigue strength of A7N01S-T5 aluminum alloy welded joints in high-speed trains
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Effect of humidity on porosity, microstructure, and fatigue strength of A7N01S-T5 aluminum alloy welded joints in high-speed trains

机译：湿度对高速列车A7N01S-T5铝合金焊接接头的气孔，微观结构和疲劳强度的影响

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摘要

Humidity is a key factor affecting the quality of welded joints for high-speed trains. Welded joints made of A7N01S-T5 aluminum alloy were fabricated under five relative environmental humidity conditions: 50%, 60%, 70%, 80%, and 90%. The microstructures of the welded joints were examined using an optical microscope and porosity quantities were calculated from macrographs using image analysis software. The fatigue strength of the welded joints was measured with high-cycle fatigue testing. It was determined that the microstructures and grain sizes in the weld zone and heat-affected zone (HAZ) were similar under different humidity conditions; however, porosity distribution varied significantly. Porosity quantity increased as humidity increased. The weld joint made under the 90% humidity condition had the highest quantity of porosity, while the weld joint made under the 70% humidity condition had the maximum diameter and area of porosity. The weld joint made under the 70% humidity condition also had the lowest fatigue strength. Fracture morphology of fatigue samples showed that the weld joint made under the 70% humidity condition had brittle fracture, while others showed ductile fracture. Therefore, 70% humidity was determined to be the critical humidity level for welding joints in high humidity environment.
机译：湿度是影响高速列车焊接接头质量的关键因素。由A7N01S-T5铝合金制成的焊接接头是在五个相对环境湿度条件下制造的：50％，60％，70％，80％和90％。使用光学显微镜检查焊接接头的微观结构，并使用图像分析软件根据宏观图计算孔隙率。焊接接头的疲劳强度通过高周疲劳测试进行测量。结果表明，在不同的湿度条件下，焊接区和热影响区（HAZ）的组织和晶粒尺寸相似。然而，孔隙度分布差异很大。孔隙率随湿度的增加而增加。在湿度为90％的条件下制作的焊接接头的气孔率最高，而在湿度为70％的条件下制作的焊接接头的气孔直径和面积最大。在70％湿度条件下制成的焊接接头的疲劳强度也最低。疲劳试样的断裂形态表明，在湿度为70％的条件下制成的焊接接头具有脆性断裂，而其他接头则具有韧性断裂。因此，确定70％的湿度为高湿度环境下焊接接头的临界湿度水平。

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  • 来源
    《Materials & design》 |2015年第15期|309-317|共9页
  • 作者

    G. Gou; M. Zhang; H. Chen; J. Chen; P. Li; Y.P. Yang;

  • 作者单位

    School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, China;

    School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, China;

    School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, China;

    School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, China,Chengdu Technician College, Chengdu 611731, China;

    CSR Qingdao Sifang Co. Ltd, Qingdao 266000, China;

    EWI, Columbus, OH 43221, USA;

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

    Aluminum alloy; Welding; Humidity; Porosity; Fatigue; High-speed train;

    机译：铝合金;焊接;湿度;孔隙率疲劳;高速火车;

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