焊接学报 >

2022 , Vol. 43 >Issue 5: 14 - 20

DOI: https://doi.org/10.12073/j.hjxb.20210825004

高性能焊接与评价

表层组织状态对6005A铝合金MIG焊接头液化裂纹及疲劳性能的影响

  • 韩晓辉 ,
  • 李帅贞 ,
  • 吴来军 ,
  • 檀财旺 ,
  • 李刚卿 ,
  • 宋晓国
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  • 1. 中车青岛四方机车车辆股份有限公司, 青岛, 266111;
    2. 哈尔滨工业大学, 先进焊接与连接国家重点实验室, 哈尔滨, 150001;
    3. 哈尔滨工业大学(威海), 山东省特种焊接技术重点实验室, 威海, 264209
韩晓辉，博士，教授级高级工程师；主要从事轨道客车焊接技术研究与开发； Email: 13793237339@139.com

收稿日期: 2021-08-25

  网络出版日期: 2022-07-14

基金资助

国家自然科学基金资助项目(52074097，52005132)；山东省重点研发计划(重大科技创新工程)(2021ZLGX01).

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Effects of surface layer microstructure on liquation crack and fatigue properties of 6005A aluminum alloy MIG joints

  • HAN Xiaohui ,
  • LI Shuaizhen ,
  • WU Laijun ,
  • TAN Caiwang ,
  • LI Gangqing ,
  • SONG Xiaoguo
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  • 1. CRCC Qingdao Sifang Co., Ltd., Qingdao, 266111, China;
    2. State Key Laboratory of Advanced Welding and Joining, Harbin, 150001, China;
    3. Shandong Provincial Key Laboratory of Special Welding Technology, Harbin Institute of Technology at Weihai, Weihai, 264209, China

Received date: 2021-08-25

  Online published: 2022-07-14

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摘要

采用扫描电镜、透射电镜、电子背散射衍射和高周疲劳试验，研究了表层组织状态对轨道交通用6005A铝合金MIG焊接头液化裂纹及疲劳性能的影响. 结果表明，粗晶组织晶界附近第二相粗大，导致热影响区晶界液膜厚度达到8 ~ 10 μm，使得液化晶界抵抗拉应力的能力降低，从而对液化裂纹缺陷更敏感. 因表层粗晶组织形成的液化裂纹成为疲劳过程中可能的裂纹源，对接头疲劳性能产生不利影响. 改善母材表层粗晶组织可以抑制液化裂纹的形成，提高接头疲劳性能. 在1 × 107循环周次下，表层粗晶接头疲劳强度为93 MPa，表层细晶接头疲劳强度为107 MPa.

关键词： 6005A铝合金; 粗晶组织; MIG焊接头; 液化裂纹; 疲劳性能

本文引用格式

韩晓辉 , 李帅贞 , 吴来军 , 檀财旺 , 李刚卿 , 宋晓国 . 表层组织状态对6005A铝合金MIG焊接头液化裂纹及疲劳性能的影响[J]. 焊接学报, 2022 , 43(5) : 14 -20 . DOI: 10.12073/j.hjxb.20210825004

Abstract

The effects of surface microstructure on liquation cracks and fatigue properties of 6005A aluminum alloy MIG joints used in high-speed train bodies were comparatively studied. The results showed that the second phase near the grain boundary of the coarse-grained microstructure was coarse, resulting in larger thickness of the grain boundary liquid film in the heat-affected zone reaching 8~10 μm, which made the liquefied grain boundary less resistant to tensile stress and more sensitive to liquation cracks. The liquation cracks formed by the surface coarse-grained microstructure become possible crack sources during the fatigue process, which adversely affect the fatigue properties of the joints. Improving the surface microstructure of the base metal could suppress the formation of liquation cracks and improve the fatigue performance of the joint. The fatigue strength of the surface coarse-grained joint was 93 MPa under 1 ×107 cycles, while that of the surface fine-grained joint was 107 MPa.

Key words： 6005A aluminum alloy; coarse grained microstructure; MIG joints; liquation crack; fatigue properties

参考文献

[1] 董晓晶, 李桓, 杨立军, 等. 铝合金多股复合脉冲MIG焊接接头组织及性能分析[J]. 焊接学报, 2019, 40(11): 61 ? 67
Dong Xiaojing, Li Huan, Yang Lijun, et al. Microstructure and mechanical properties of pulse MIG aluminum alloy welded joints by means of a novel multi-strands composite welding wire[J]. Transactions of the China Welding Institution, 2019, 40(11): 61 ? 67
[2] Wang Y, Wei B, Guo Y, et al. Microstructure and mechanical properties of the joint of 6061 aluminum alloy by plasma-MIG hybrid welding[J]. China Welding, 2017, 26(2): 58 ? 64.
[3] Qi Guangbin, Dong Honggang, Yang Jiang, et al. Texture and mechanical properties of metal inert gas welded 6082-T651 aluminum alloy joints[J]. China Welding, 2021, 30(1): 1 ? 12.
[4] 邵盈恺, 王玉玺, 杨志斌, 等. 基于熔深优化的7075铝合金等离子-MIG复合焊接热裂纹敏感性[J]. 金属学报, 2018, 54(4): 547 ? 556
Shao Yingkai, Wang Yuxi, Yang Zhibin, et al. Plasma-MIG hybrid welding hot cracking susceptibility of 7075 aluminum alloy based on optimum of weld penetration[J]. Acta Metallurgiga Sinica, 2018, 54(4): 547 ? 556
[5] Huang C, Kou S. Liquation cracking in partial-penetration aluminum welds: Effect of penetration oscillation and backfilling[J]. Welding Journal, 2003, 82(6): 184 ? 194.
[6] 王俊, 李芳, 张跃龙, 等. 焊丝中Si元素含量对铝合金接头裂纹敏感性的影响规律及机理[J]. 焊接学报, 2020, 41(1): 55 ? 60
Wang Jun, Li Fang, Zhang Yuelong, et al. Effect of Si content in welding wire on crack sensitivity of aluminum alloy and its mechanism[J]. Transactions of the China Welding Institution, 2020, 41(1): 55 ? 60
[7] 俞照辉, 严红革, 严军辉, 等. 热影响区连续孔隙状裂纹的表征及产生机理[J]. 焊接学报, 2019, 40(5): 84 ? 88
Yu Zhaohui, Yan Hongge, Yan Junhui, et al. Characterization and formation mechanisms of continuous porosities-llike cracks in the heat-affected zone[J]. Transactions of the China Welding Institution, 2019, 40(5): 84 ? 88
[8] Dong P, Li H M, Sun D Q, et al. Effects of welding speed on the microstructure and hardness in friction stir welding joints of 6005A-T6 aluminum alloy[J]. Marerials & Design, 2013, 45: 524 ? 531.
[9] Ji S D, Meng X C, Liu J G, et al. Formation and mechanical properties of stationary shoulder friction stir welded 6005A-T6 aluminum alloy[J]. Marerials & Design, 2014, 62: 113 ? 117.
[10] 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. Welded hot crack analysis of 6005A aluminum[J]. Transactions of the China Welding Institution, 2012, 33(8): 60 ? 64
[11] 刘敬萱, 沈健, 李锡武, 等. 6005A-T6铝合金搅拌摩擦焊接头组织与疲劳性能[J]. 材料导报, 2021, 35(2): 2092 ? 2097
Liu Jingxuan, Shen Jian, Li Xiwu, et al. Microstructure and fatigue properties of friction stir welded 6005A-T5 aluminum alloy[J]. Materials Reports, 2021, 35(2): 2092 ? 2097
[12] Liu Haobo, Yang Shanglei, Xie Charjie, et al. Mechanisms of fatigue crack initiation and propagation in 6005A CMT welded joint[J]. Journal of alloys and Compounds, 2018, 741: 188 ? 196.
[13] Birol Yucel. Impact of partial recrystallization on the performance of 6005A tube extrusions[J]. Engineering Failure Analysis, 2010, 17(5): 1110 ? 1116.
[14] 申澎洋, 唐建国, 叶凌英, 等. 组织不均匀性对6005A铝合金晶间腐蚀性能的影响[J]. 材料研究学报, 2018, 32(10): 751 ? 758
Shen Pengyang, Tang Jianguo, Ye Lingying, et al. Effects of microstructure heterogeneity on intergranular corrosion susceptibility of Al-alloy 6005A[J]. Chinese Journal of Materials Research, 2018, 32(10): 751 ? 758
[15] 张大鹏, 王顺成, 周楠, 等. 粗晶环对无铅2011铝合金挤压棒材力学与切削性能的影响[J]. 强合金加工技术, 2020, 48(7): 24 ? 27
Zhang Dapeng, Wang Shuncheng, Zhou Nan, et al. Effects of coarse-grained on mechanical properties and cutting performance of lead-free 2011 aluminum alloy extruded bar[J]. Light Alloy Fabrication Technology, 2020, 48(7): 24 ? 27
[16] 刘聪, 袁定旺, 杨修波, 等. 组织不均匀性对铝合金焊接区裂纹的影响[J]. 电子显微学报, 2015, 34(3): 181 ? 188
Liu Cong, Yuan Dingwang, Yang Xiubo, et al. Effects of microstructure heterogeneity on crack behaviors in the welding zones of aluminum alloys parts[J]. Journal of Chinese Electron Microscopy Society, 2015, 34(3): 181 ? 188
[17] 李学朝. 铝合金材料组织与金相图谱[M]. 北京: 冶金工业出版社, 2019.
Li Xuechao. Microstructure and metallographic spectrum of aluminum alloy materials [M]. Beijing: Metallurgical Industry Press, 2019.
[18] Huang C, Kou S. Partially melted zone in aluminum welds-liquation mechanism and directional solidification[J]. Welding Journal, 2000, 79(5): 113 ? 120.
[19] 李乐, 路媛媛, 唐峰, 等. 表面纳米化对镍基高温合金焊接液化裂纹的影响[J]. 焊接学报, 2019, 40(1): 151 ? 155
Li Le, Lu Yuanyuan, Tang Feng, et al. Effect of surface nanocrystallization on welding liquation cracking of nickel-base superalloy[J]. Transactions of the China Welding Institution, 2019, 40(1): 151 ? 155
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