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材料导报  2018, Vol. 32 Issue (22): 3936-3940    https://doi.org/10.11896/j.issn.1005-023X.2018.22.017
  金属与金属基复合材料 |
厚板铝合金搅拌摩擦焊接头的冲击性能
张忠科, 张剑飞, 于洋, 王希靖
兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室,兰州 730050
Impact Performance of Friction Stir Welded Joints of Thick Plate Aluminum Alloy
ZHANG Zhongke, ZHANG Jianfei, YU Yang, WANG Xijing
State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology, Lanzhou 730050
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摘要 采用搅拌摩擦焊对厚度为30 mm的2A12铝合金板材进行对焊连接,分析了接头不同厚度处的微观组织与冲击性能。结果表明:随着热输入量的减少,接头上层的晶粒相比于下层出现了粗化现象,导致接头上层区域的冲击韧性低于下层。焊核区晶粒最为细小,热机影响区次之,热影响区晶粒最为粗大;焊核区的冲击韧性高于热影响区,热机影响区由于存在微型裂纹,所以冲击韧性最低。焊核区上层的晶粒尺寸小于热机影响区下层的晶粒尺寸,但焊核区上层的冲击韧性低于热机影响区下层的冲击韧性,这是由于焊核区所含的Al2CuMg脆性第二相的数量较多。焊接接头冲击韧性的变化不仅与焊缝不同区域的微观组织变化有关,还与该区域的第二相数量有关。
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张忠科
张剑飞
于洋
王希靖
关键词:  搅拌摩擦焊  2A12铝合金  厚板  显微组织  冲击韧性    
Abstract: Butt welding of 2A12 aluminum alloy with thickness of 30 mm was conducted by friction stir welding, the microstructure and impact performance of the joints were analyzed at different thickness positions. The results showed that with the decrease of the heat input, the grain size in the upper part of the weld nugget zone (NZ) was coarsening compared to the lower part of NZ. Causing the impact toughness in the upper area of the joint lower than that in the bottom. The grain size was the smallest in the NZ, a little bit coarser in the thermo-mechanically affected zone (TMAZ), and the coarsest in the heat affected zone (HAZ). There existed difference in impact toughness of the welded joint. The impact toughness of NZ was higher than that of HAZ, The impact toughness of TMAZ was the lowest due to the existence of micro cracks. The grain size of the upper part of NZ was smaller than that of the bottom part of TMAZ, but the impact toughness of these two parts was just the opposite, because the number of the second phase (Al2CuMg) was larger in NZ. In conclusion the change of impact toughness of welded joints was not only related to the microstructure variation, but also the amount of the second phase in the region.
Key words:  friction stir welding    2A12 aluminum alloy    thick plate    microstructure    impact toughness
               出版日期:  2018-11-25      发布日期:  2018-12-21
ZTFLH:  TG457.1  
基金资助: 国家自然科学基金(10902047);航空科学基金(201611U2001)
作者简介:  张忠科:男,1978年生,副教授,博士,研究方向为焊接设备及其自动化,新型连接技术 E-mail:zhangzke@lut.cn
引用本文:    
张忠科, 张剑飞, 于洋, 王希靖. 厚板铝合金搅拌摩擦焊接头的冲击性能[J]. 材料导报, 2018, 32(22): 3936-3940.
ZHANG Zhongke, ZHANG Jianfei, YU Yang, WANG Xijing. Impact Performance of Friction Stir Welded Joints of Thick Plate Aluminum Alloy. Materials Reports, 2018, 32(22): 3936-3940.
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http://www.mater-rep.com/CN/10.11896/j.issn.1005-023X.2018.22.017  或          http://www.mater-rep.com/CN/Y2018/V32/I22/3936
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