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基于原位SEM的激光-MIG复合焊接7075-T6铝合金疲劳裂纹扩展行为

常丽艳, 宋西平, 张敏, 吴圣川

常丽艳, 宋西平, 张敏, 吴圣川. 基于原位SEM的激光-MIG复合焊接7075-T6铝合金疲劳裂纹扩展行为[J]. 焊接学报, 2016, 37(5): 85-88.
引用本文: 常丽艳, 宋西平, 张敏, 吴圣川. 基于原位SEM的激光-MIG复合焊接7075-T6铝合金疲劳裂纹扩展行为[J]. 焊接学报, 2016, 37(5): 85-88.
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CHANG Liyan, SONG Xiping, ZHANG Min, WU Shengchuan. In situ SEM based fatigue crack propagation behavior of hybrid laser welded 7075-T6[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2016, 37(5): 85-88.
Citation: CHANG Liyan, SONG Xiping, ZHANG Min, WU Shengchuan. In situ SEM based fatigue crack propagation behavior of hybrid laser welded 7075-T6[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2016, 37(5): 85-88.
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基于原位SEM的激光-MIG复合焊接7075-T6铝合金疲劳裂纹扩展行为

  • 1.

    北京科技大学新金属国家重点实验室, 北京 100083

  • 2.

    西南交通大学 牵引动力国家重点实验室, 成都 610031

基金项目: 牵引动力国家重点实验室开放基金资助项目(2015TPL_T07,TPL1505);国家自然科学基金资助项目(11572267)

In situ SEM based fatigue crack propagation behavior of hybrid laser welded 7075-T6

  • 1.

    State Key Lab for Advanced Metals and Material, Beijing University of Science and Technology, Beijing 100083, China

  • 2.

    State Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu 610031, China

摘要

    摘要
  • 摘要: 通过扫描电镜原位观察激光复合焊接头各区裂纹的扩展行为. 结果表明,焊缝各区组织的不同使得疲劳裂纹扩展行为发生明显改变,疲劳裂纹位于焊缝中心时,裂纹总体沿着垂直于载荷主轴的方向扩展;疲劳裂纹位于热影响区时,裂纹大致成"Z"字型路径进行扩展;疲劳裂纹在焊缝中心和热影响区扩展时都存在二次裂纹;疲劳裂纹在母材区扩展时,呈现出单一和典型的裂纹扩展模式. 此外,通过原位SEM观察获得不同循环周期下的裂纹扩展长度,进而推算得到7075-T6铝合金接头各区内疲劳裂纹扩展速率的Paris公式.
    Abstract: The fatigue crack propagation behavior of welded 7075-T6 aluminium alloy was investigated by scanning electron microscope in-situ observation in room temperature. These results indicated that differences of fatigue crack propagation behavior among fusion zone, HAZ (heat affected zone) and base metal were attributed to microstructural feature. The crack propagated in fusion zone perpendicular to the stress axis; Zigzag crack propagation path was formed in HAZ; Many secondary cracks were observed at the surface of fusion zone and HAZ. "Single crack" mode was found in base metal. In addition, the Paris law of fusion zone, HAZ and base metal for welded 7075-T6 aluminium alloy was obtained by calculating through the lengths of fatigue crack and cycles.
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    • 参考文献(5)
  • [1] 王炎金. 铝合金车体焊接工艺[M]. 北京: 机械工业出版社, 2011.
    [2] Hu B, Richardson I M. Microstructure and mechanical properties of AA7075 (T6) hybrid laser/GMA welds[J]. Materials Science and Engineering: A, 2007, 459(1): 94-100.
    [3] Wu S C, Yu X,Zuo R Z, et al. Porosity element loss and strength model on softening behavior of hybrid laser arc welded Al-Zn-Mg-Cu alloy with synchrotron radiationa analysis[J]. Welding Journal, 2013, 92(3): 64-71
    [4] 吴圣川, 周鑫淼, 张卫华, 等. 激光-电弧复合焊接7075-T6铝合金裂纹扩展分析[J]. 焊接学报, 2013, 34(2): 5-8. Wu Shengchuan, Zhou Xinmiao, Zhang Weihua, et al. Fatigue life prediction of laser-MIG hybrid welded 7075-T6 Al alloy joints[J]. Transactions of the China Welding Institution. 2013, 34(2): 5-8.
    [5] 常丽艳, 宋西平, 李宏良, 等. 7075铝合金激光-MIG复合焊接接头组织及性能的分析[J]. 热加工工艺, 2014, 43(9): 25-28. Chang Liyan, Song Xiping, Li Hongliang, et al. Microstructures and mechanical properties of laser-MIG hybrid welded joint of 7075-T6 Al alloy[J]. Hot Working Technology, 2014, 43(9): 25-28.
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  • 收稿日期:  2014-07-23

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