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新型高铜的6005A铝合金焊接接头疲劳性能

季凯, 张静, 徐玉松

季凯, 张静, 徐玉松. 新型高铜的6005A铝合金焊接接头疲劳性能[J]. 焊接学报, 2017, 38(1): 95-98.
引用本文: 季凯, 张静, 徐玉松. 新型高铜的6005A铝合金焊接接头疲劳性能[J]. 焊接学报, 2017, 38(1): 95-98.
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JI Kai, ZHANG Jing, XU Yusong. Fatigue properties of welded joints of New 6005A alloy with high copper content[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2017, 38(1): 95-98.
Citation: JI Kai, ZHANG Jing, XU Yusong. Fatigue properties of welded joints of New 6005A alloy with high copper content[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2017, 38(1): 95-98.
shu

新型高铜的6005A铝合金焊接接头疲劳性能

  • 江苏科技大学(张家港校区)冶金与材料学院, 张家港 215600

基金项目: 江苏省科技厅自然科学青年基金资助项目（BK20130465）；江苏教育厅高校基金面上资助项目（13KJB430011）

Fatigue properties of welded joints of New 6005A alloy with high copper content

  • School of Metallurgy & Materials, Zhangjiagang campus, Jiangsu University of Science and Technology, Zhangjiagang 215600, China

摘要

    摘要
  • 摘要: 采用扫描电镜，透射电镜，拉伸试验及疲劳试验分析两种6005A铝合金焊接接头的组织及疲劳性能，揭示影响6005A铝合金焊接接头疲劳裂纹形成的主要原因.结果表明，适量铜能显著提升商用6005A铝合金拉伸性能与疲劳性能，其抗拉强度、断后伸长率和高周疲劳强度分别为220 MPa，12%和106 MPa.6005A铝合金焊接区域疲劳失效源于受焊接热输入影响的沉淀相Mg2Si粗化长大，适量铜能稳定热影响区相成分，改善远离焊缝的软化区间强化相Mg2Si在结晶面上偏聚，提高接头区域的疲劳性能.
    Abstract: Microstructure and fatigue properties of welded joints of two 6005A alloy were investigated by scanning electron microscopy(SEM), transmission electron microscopy(TEM), tensile test and fatigue test. Moreover, the main cause of the fatigue crack initiation of welded joint of 6005A alloy was revealed. The results show that Cu can clearly improve the tensile and fatigue properties of commercial 6005A alloy. The tensile strength, elongation, fatigue strength of welded joint of self-made 6005A aluminum alloy are 220 MPa, 12% and 106 MPa respectively. The size and the distributtion of precipitation phase Mg2Si in welding heat affected zone affect the fatigue of the 6005A joint significantly. So, it improves the composition control in welding heat affected zone, the segregated degree on Mg2Si phase away from weld softening zone and the fatigue properties of welded joint.
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    • 参考文献(7)
  • [1] Gonzalo M, Domínguez A, Jorge L, et al. Fatigue endurance and crack propagation under rotating bending fatigue tests on aluminum alloy AISI 6063-T5 with controlled corrosion attack[J]. Engineering Fracture Mechanics, 2012, 93:119-131.
    [2] 闫德俊. 高速列车底架用铝合金焊接接头疲劳裂纹扩展特性[D]. 哈尔滨:哈尔滨工业大学, 2011.
    [3] 陆善平, 魏世同, 李殿中, 等. 焊丝成分对高速列车转向架焊接接头性能的影响[J]. 焊接学报, 2010, 31(6):21-24. Lu Shanping, Wei Shitong, Li Dianzhong, et al. Effects of welding wire composition on properties of welding joints for high speed train bogie[J]. Transactions of the China Welding Institution, 2010, 31(6):21-24.
    [4] Nielsen K L, Pardoen T, Tvergaard V, et al. Modelling of plastic flow localisation and damage development in friction stir welded 6005A aluminium alloy using physics based strain hardening law[J]. International Journal of Solids and Structures, 2010, 47(18/19):2359-2370.
    [5] Iuliana L, Ildiko P, Bela V, et al. Preparation and structural characterization of rapidly solidified Al-Cu Alloys original research Article[J]. Journal of Materials Science & Technology, 2014, 30(4):394-400.
    [6] 杨文超, 汪明朴, 盛晓菲, 等. 轨道交通车辆用6005A合金板材时效析出及硬化行为研究[J]. 金属学报, 2012, 46(12):1481-1487. Yang Wenchao, Wang Mingpu, Sheng Xiaofei, et al. Study of the aging precipitation and hardening behavior of 6005 a alloy sheet for rail traffic vehicle[J]. Acta Metallurgica Sinica, 2012, 46(12):1481-1487.
    [7] Alireza H A, Frank A. Effect of conventional and rheocasting processes on microstructural characteristics of hypereutectic Al-Si-Cu-Mg alloy with variable Mg content[J]. Journal of Materials Processing Technology, 2010, 210(5):767-775.
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  • 收稿日期:  2014-11-21

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