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超声冲击对7A52铝合金焊接接头疲劳性能的影响

解瑞军, 陈芙蓉, 唐大富, 陈超

解瑞军, 陈芙蓉, 唐大富, 陈超. 超声冲击对7A52铝合金焊接接头疲劳性能的影响[J]. 焊接学报, 2017, 38(6): 56-60.
引用本文: 解瑞军, 陈芙蓉, 唐大富, 陈超. 超声冲击对7A52铝合金焊接接头疲劳性能的影响[J]. 焊接学报, 2017, 38(6): 56-60.
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XIE Ruijun, CHEN Furong, TANG Dafu, CHEN Chao. Effect on the fatigue properties of 7A52 aluminum alloy welded joint by ultrasonic impact[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2017, 38(6): 56-60.
Citation: XIE Ruijun, CHEN Furong, TANG Dafu, CHEN Chao. Effect on the fatigue properties of 7A52 aluminum alloy welded joint by ultrasonic impact[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2017, 38(6): 56-60.
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超声冲击对7A52铝合金焊接接头疲劳性能的影响

  • 内蒙古工业大学 材料科学与工程学院, 呼和浩特 010051

基金项目: 国家自然科学基金资助项目（51165026）；内蒙古自治区自然科学基金资助项目（2015MS0537）

Effect on the fatigue properties of 7A52 aluminum alloy welded joint by ultrasonic impact

  • School of Materials Science and Engineering, Inner Mongolia University of Technology, Hohhot 010051, China

摘要

    摘要
  • 摘要: 文中对超声冲击处理前后的7A52铝合金焊接接头显微组织、显微硬度以及残余应力进行了分析，并对超声冲击处理前后的接头在不同循环应力比的加载条件下进行了疲劳试验.结果表明，经超声冲击处理后接头塑性变形层厚度在45~70 μm左右，母材区表面硬度提高了170%，焊缝区硬度提高了大约70%，改变了焊态残余应力分布，成功引入了压应力；在疲劳试验中，循环次数为2×106的条件下，加载应力循环比为0.1时，冲击态接头的疲劳强度为60.26 MPa，比疲劳强度为40.74 MPa的焊态试样提高了47.9%，而在加载应力循环比为0.45时，冲击态接头的疲劳强度为46.53 MPa，比疲劳强度为39.97 MPa的焊态试样提高了16.4%.
    Abstract: In this paper, the microstructure, microhardness, residual stress and fatigue test of ultrasonic impact before and after the processing of 7A52 aluminum alloy welded joint were analyzed. The results showed that joint plastic deformation layer thickness was about 45 to 70 μm, base metal hardness increased by 170%, weld surface hardness increased by 70%, after ultrasonic impact treatment. In fatigue tests, when the cycles were 2×106 times, the loading stress cycle ratio was 0.1, the fatigue strength of the impact of state joint was 60.26 MPa, increased by 47.9% than the welded specimen fatigue strength was 40.74%. In the loading cycle stress ratio was 0.45, the fatigue strength of the impact of state joint was 46.53 MPa, increased by 16.4% than the welded specimen fatigue strength is 39.97 MPa.
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    • 参考文献(9)
  • [1] Zhao Junjun, Wang Weixin, Cai Zhihai, et al. Stress corrosion cracking susceptibility of 7A52 aluminum alloy[J]. Transactions of Nonferrous Metals Society of China, 2006, 16(A03): 1523-1527.
    [2] 方家芳, 尹志民, 黄继武, 等. 7A52铝合金热加工过程中高温压缩变形行为[J]. 轻合金加工技术, 2006, 34(5): 48-52. Fang Jiafang, Yin Zhimin, Huang Jiwu, et al. Study of high temperature flow behavior of 7A52 aluminum alloy[J]. Light Alloy Fabrication Technology, 2006, 34(5): 48-52.
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    [4] Kawa T O, Shimanu K H, Funatsu Y, et al. Effect of preload and stress ratio on fatigue strength of welded joints improved by ultrasonic impact treatment[J]. Weld World, 2013, 57(2): 235-241.
    [5] 于影霞, 邓海鹏, 何柏林, 等. 超声冲击对MB8镁合金对接接头疲劳性能的影响[J]. 焊接学报, 2016, 37(8): 124-127. Yu Yingxia, Deng Haipeng, He Bolin, et al. Effect of ultrasonic impact treating on the fatigue properties of MB8 magnesium alloy butt joint[J]. Transactions of the China Welding Institution, 2016, 37(8): 124-127.
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    [7] 贾翠玲, 陈芙蓉. 超声冲击工艺参数对装甲铝合金焊接残余应力影响的有限元分析[J]. 焊接学报, 2016, 37(2): 9-12. Jia Cuiling, Chen Furong. Numerically simulating the effect of ultrasonic impact parameters on welding stress in 7A52 aluminum alloy[J]. Transactions of the China Welding Institution, 2016, 37(2): 9-12.
    [8] Zhao Xiaohui, Wang Dongpo, Huo Lixing. Analysis of the S-N curves of welded joints enhanced by ultrasonic peening treatment[J]. Materials & Design, 2011, 32(1): 88-96.
    [9] 王文先, 李 娟, 李晋永, 等. 基于热点应力法的AZ31B镁合金焊接接头疲劳评定[J]. 机械工程学报, 2011, 47(10): 52-56. Wang Wenxian, Li Juan, Li Jinyong, et al. Fatigue evaluation on AZ31B magnesium alloy weld joints by hot spot stress approach[J]. Journal of Mechanical Engineering, 2011, 47(10): 52-56.
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  • 收稿日期:  2016-05-23

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