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铝合金焊缝疲劳开裂的原位同步辐射X射线成像

吴圣川, 胡雅楠, 付亚楠, BuffièreJY

吴圣川, 胡雅楠, 付亚楠, BuffièreJY. 铝合金焊缝疲劳开裂的原位同步辐射X射线成像[J]. 焊接学报, 2015, 36(12): 5-8.
引用本文: 吴圣川, 胡雅楠, 付亚楠, BuffièreJY. 铝合金焊缝疲劳开裂的原位同步辐射X射线成像[J]. 焊接学报, 2015, 36(12): 5-8.
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WU Shengchuan, HU Yanan, FU Yanan, Buffière J Y. Study on fatigue cracking of welded aluminum alloys via in situ synchrotron radiation X-ray microtomography[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2015, 36(12): 5-8.
Citation: WU Shengchuan, HU Yanan, FU Yanan, Buffière J Y. Study on fatigue cracking of welded aluminum alloys via in situ synchrotron radiation X-ray microtomography[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2015, 36(12): 5-8.
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铝合金焊缝疲劳开裂的原位同步辐射X射线成像

  • 1.

    西南交通大学 牵引动力国家重点实验室, 成都 610031

  • 2.

    中国科学院 上海应用物理研究所, 上海 201204

  • 3.

    法国里昂国立应用科学学院 材料实验室, 法国 里昂 F-69621

基金项目: 国家自然科学基金资助项目(11572267);牵引动力国家重点实验室开放基金资助项目(2015TPL_T07,TPL1505,TPL1503)

Study on fatigue cracking of welded aluminum alloys via in situ synchrotron radiation X-ray microtomography

  • 1.

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

  • 2.

    Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201204, China

  • 3.

    Laboratoire Materiaux, MATEIS, INSA-Lyon/CNRS-UMR 5510, Villeurbanne F-69621, France

摘要

    摘要
  • 摘要: 基于第三代高精度同步辐射X射线三维成像技术,开展表面经抛光的铝合金光纤激光-脉冲电弧复合焊接头疲劳裂纹萌生和扩展的原位可视化研究. 结果表明,疲劳裂纹均优先从样品(亚或次)表面或角(亚)表面上的焊接气孔处萌生和扩展,并呈现典型的I型表面半椭圆或四分之一椭圆(或圆形)裂纹形貌. 一旦裂纹萌生,裂纹在表面的扩展速率低于内部,且存在局部加速和停滞现象,萌生源的特征长度越大,则裂纹萌生和扩展寿命越短,裂纹形貌为高度非线性的空间特征. 此外基于经典Newman表面半椭圆形裂纹形貌预测结果与试验基本一致.
    Abstract: Hybrid fiber laser and pulsed arc welded aluminum alloys via sound polishing were prepared and then three dimensional in situ fatigue imaging of welded joints was conducted by the high resolution synchrotron radiation X-ray computed microtomography (SR-μCT). Experimental results show that fatigue cracks are frequently initiated and propagated from the broken pores at the surface or sub-surface of hybrid welds, presenting a typical I mode semi-elliptical and quarter ellipse or circle profile. It is also found that the inner fatigue crack growth is faster than the surface crack with significant local acceleration and arrest behaviors together with highly nonlinear spatial propagation. Moreover, the longer the characteristic length of initial crack, the shorter the fatigue life of hybrid welds. Besides, there is a good agreement between the prediction of fatigue crack morphology based on Newman method and experimental results.
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    • 参考文献(10)
  • [1] 张 健, 雷 振, 王旭友. 高速列车6005A铝合金型材焊接热裂纹分析[J]. 焊接学报, 2012, 33(8): 60-64. Zhang Jian, Lei Zhen, Wang Xuyou. Weld hot crack analysis of 6005A aluminum alloy profile for high-speed train[J]. Transactions of the China Welding Institution, 2012, 33(8): 60-64.
    [2] 郑修麟, 王 泓, 鄢君辉, 等. 材料疲劳理论与工程应用[M]. 北京: 科学出版社, 2013.
    [3] 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 alloys joints[J]. Transactions of the China Welding Institution, 2013, 34(2): 5-8.
    [4] 亚伯·斯海维. 材料与结构的疲劳[M]. 第二版, 吴学仁, 译. 北京: 航空工业出版社, 2014.
    [5] 王绍刚, 王苏程, 张 磊. 高分辨透射X射线三维成像在材料科学中的应用[J]. 金属学报, 2013, 49(8): 897-910. Wang Shaogang, Wang Sucheng, Zhang Lei. Application of high resolution transmission X-ray tomography in material science[J]. Acta Metallurgical Sinica, 2013, 49(8): 897-910.
    [6] Buffière J Y, Savelli S, Jouneau P H, et al. Experimental study of porosity and its relation to fatigue mechanism of model Al-Si7-Mg0.3 cast Al alloys[J]. Material Science Engineering A, 2001, 316(1/2): 115-126.
    [7] Zhang H, Toda H, Qu P C, et al. Three-dimensional fatigue crack growth behavior in an aluminum alloy investigated with in situ high-resolution synchrotron X-ray microtomography[J]. Acta Materialia, 2009, 57(11): 3287-3300.
    [8] 喻 程, 吴圣川, 胡雅楠, 等. 铝合金熔焊微气孔的三维同步辐射X射线成像[J]. 金属学报, 2015, 51(2): 159-168. Yu Cheng, Wu Shengchuan, Hu Yanan, et al. Three-dimensional imaging of gas pores in fusion welded Al alloys by synchrotron radiation X-ray microtomography[J]. Acta Metallurgical Sinica, 2015, 51(2): 159-168.
    [9] 何 超, 崔仕明, 刘永杰, 等. 气孔对铝合金焊接接头超长疲劳寿命的影响[J]. 焊接学报, 2014, 35(11): 18-22. He Chao, Cui Shiming, Liu Yongjie, et al. Effect of pore on super long fatigue life of aluminum alloy welded joint[J]. Transactions of the China Welding Institution, 2014, 35(11): 18-22.
    [10] Newman Jr J C, Raju I S. An empirical stress-intensity factor equation for the surface crack[J]. Engineering Fracture Mechanics, 1981, 15(1): 185-192.
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  • 收稿日期:  2015-04-14

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