6061铝合金厚板搅拌摩擦焊接头组织与耐蚀性
Microstructure and corrosion resistance of friction stir welded joints of thick 6061 aluminum alloy plate
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摘要: 采用搅拌摩擦焊对30 mm厚的6061铝合金进行了双面对接焊，分别采用金相显微镜、显微硬度仪和电化学工作站对焊接接头的组织、硬度和耐蚀性能进行观察、测量和研究。金相观察显示，双面搅拌摩擦焊焊缝前进侧与母材有明显的分界，后退侧分界模糊；焊核区呈均匀细小的等轴晶。硬度测试表明，搅拌摩擦焊接接头硬度呈“W”形特征分布，硬度最低值出现在前进侧热影响区。腐蚀试验表明，双面焊焊核重叠区腐蚀电流(2.396 3×10-5A/cm2)较大，一旦开始腐蚀，腐蚀速度很快，耐腐蚀能力相对较差。Abstract: The double-sided friction stir welding process were used to weld 6061 aluminum alloy with the thickness of 30 mm, and the microstructure, micro-hardness and corrosion resistance of the welded joints were analyzed and tested by means of metallographic microscope, micro-hardness tester and electrochemical workstation. The metallographic observation shows that there is an obvious boundary between the advancing side of the friction stir welded joint and the base metal, while the boundary of retreating side and the base metal is blurred, the grains in weld nugget zone are homogeneous and fine equiaxed crystal. The micro-hardness curve of friction stir welded joints shows a “W” shape. The minimum micro-hardness appears in the heat affected zone. The corrosion test shows that the corrosion current is larger in the overlapping area of double-side welded joints, once the corrosion is started, the corrosion speed is very fast, and the corrosion resistance is relatively poor.
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Keywords:
- friction stir welding /
- microstructure /
- micro-hardness /
- corrosion resistance
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[1] 栾国红.搅拌摩擦焊技术在轨道列车上制造中的应用[J]. 焊接，2015(1):7-12. [2] 王大勇，冯吉才，王攀峰. 搅拌摩擦焊接Al-Li合金接头的微观组织及力学性能[J]. 金属学报，2004，40(5): 504-508. [3] Moreira P M G P，Figueiredo M A V D，Castro P M S T. Fatigue behavior of FSW and MIG weldments for two aluminum alloys [J].Theoretical and Applied Fracture Mechanics，2007，48(2): 169-177. [4] 贺地求，罗 维，邬红光. 60 mm厚度6061-T6铝合金板搅拌摩擦焊接接头微观组织与力学性能[J].材料工程，2011(9):20-24. [5] Krishnan K N. On the formation of onion rings in friction stir welds [J].Materials Science and Engineering A，2002，327(2):246-251. [6] 高 辉，董继红，张 坤，等.厚板铝合金搅拌摩擦焊接头组织及性能沿厚度方向的变化规律[J]. 焊接学报，2014，35(8):61-65. [7] 黄凌骄，孟立春，曲文卿.7N01铝合金厚板搭接搅拌摩擦焊接头力学性能研究[J]. 热加工工艺，2017，46(3):189-191. [8] Scialpi A，Filippis LACD，Cavaliere P. Influence of shoulder geometry on microstructure and mechanical properties of friction stir welded 6082 aluminum alloy[J]. Material & Design，2007，28(4):1124-1129. [9] Adamowski J，Szkodo M. Friction stir welds (FSW) of aluminum alloy AW6082-T6[J]. Journal of Achievements in Materials and Manufacturing Engineering，2007，20(1-2):403-406. [10] 张忠科，王 丽，王希靖，等.10 mm厚LF2铝合金搅拌摩擦焊温度分布及组织分析[J]. 热加工工艺，2006，35(19):8-10.
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