对AZ31 B镁合金板进行了搅拌摩擦焊，研究了焊接接头的显微组织、物相组成、硬度及耐腐蚀性能。结果表明：该接头焊核区为细小均匀的等轴晶，热机械影响区晶粒得到细化但沿金属塑性流动方向被拉长，热影响区的显微组织与母材区的比较接近，但其晶粒略粗大；与接头母材区相比，焊缝的物相组成未发生变化，各区的硬度有所降低且硬度随距焊缝中心距离的增加呈先减小后增大的变化趋势，硬度最低处位于热机械影响区内；接头的耐腐蚀性能略低于母材的，浸泡腐蚀后接头表面发生全面腐蚀，但各区域的腐蚀程度并不相同，热机械影响区的腐蚀最严重。
The AZ31B magnesium alloy sheets were welded by friction stir welding and the microstructure, phase composition,hardness and corrosion resistance of the welded joints were investigated.The results show that the weld nugget zone of the joint was composed of small equiaxed grains and the grains in the thermal-mechanical affected zone were refined and elongated along metal plastic flow direction.The microstructure of the heat affected zone was close to that of the base metal but the grain size was slightly larger.Comparing to the base metal of the welded joint,the phase composition of the weld seam had no change but the hardness decreased slightly.The hardness in different zones first decreased then increased with the increase of the distance from the weld seam center and the lowerest hardness appeared in the thermal-mechanical affected zone.The corrosion resistance of the joint was slightly lower than that of the base metal.The surface of the joint was general corroded after immersion corrosion. However,the corrosion degrees of the different zones of the joint were different.The corrosion of the thermal-mechanical affected zone was the most serious.
参考文献
| [1] | 冯吉才;王亚荣;张忠典.镁合金焊接技术的研究现状及应用[J].中国有色金属学报,2005(2):165-178. |
| [2] | K.L. Harikrishna;J.J.S. Dilip;K. Ramaswamy Choudary.Friction stir welding of magnesium alloy ZM21[J].Transactions of the Indian Institute of Metals,20105(5):807-811. |
| [3] | 宋东福;王海艳;戚文军;蔡畅;农登;周楠.工艺参数对6 mm厚5052铝合金板搅拌摩擦焊接头的影响[J].机械工程材料,2014(5):6-11,83. |
| [4] | L. E. Murr.A Review of FSW Research on Dissimilar Metal and Alloy Systems[J].Journal of Materials Engineering and Performance,20108(8):1071-1089. |
| [5] | 阮野;邱小明;宫文彪;赵世航;孙大千.铝合金双丝MIG焊焊接接头组织与耐腐蚀性能[J].焊接学报,2011(2):109-112. |
| [6] | A. Dhanapal;S. Rajendra Boopathy;V. Balasubramanian.Developing an empirical relationship to predict the corrosion rate of friction stir welded AZ61A magnesium alloy under salt fog environment[J].Materials & design,201110(10):5066-5072. |
| [7] | 赵亚东;张运真;何强.6061-T6铝合金搅拌摩擦焊接头的组织和性能[J].机械工程材料,2014(8):93-96,100. |
| [8] | G. Padmanaban;V. Balasubramanian;J. K. Sarin Sundar.Influences of Welding Processes on Microstructure, Hardness, and Tensile Properties of AZ31B Magnesium Alloy[J].Journal of Materials Engineering and Performance,20102(2):155-165. |
| [9] | 张永红;丁金虎;王希靖.AZ31B镁合金搅拌摩擦焊接头组织与性能[J].热加工工艺,2009(9):106-108. |
| [10] | 李伟荣 .AZ31B镁合金搅拌摩擦焊焊缝微弧氧化处理的研究[D].兰州理工大学,2014. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%