东北大学学报（自然科学版）

东北大学学报(自然科学版) ›› 2006, Vol. 27 ›› Issue (1): 49-52.DOI: -

• 论著 • 上一篇    下一篇

高速列车车厢用的铝合金板焊接接头的组织与性能

田福泉;付高峰;周传良;姜澜;   

  1. 东北大学材料与冶金学院;东北大学材料与冶金学院;焦作万方铝业股份有限公司;东北大学材料与冶金学院 辽宁沈阳110004;辽宁沈阳110004;河南焦作454003;辽宁沈阳110004
  • 收稿日期:2013-06-23 修回日期:2013-06-23 出版日期:2006-01-15 发布日期:2013-06-23
  • 通讯作者: Tian, F.-Q.
  • 作者简介:-
  • 基金资助:
    教育部科学技术研究重点项目(105055)

Microstructure and properties of welded joints on Al-alloy sheets for high-speed train carriages

Tian, Fu-Quan (1); Fu, Gao-Feng (1); Zhou, Chuan-Liang (2); Jiang, Lan (1)   

  1. (1) School of Materials and Metallurgy, Northeastern University, Shenyang 110004, China; (2) Jiaozuo Wanfang Aluminum Co. Ltd., Jiaozuo 454003, China
  • Received:2013-06-23 Revised:2013-06-23 Online:2006-01-15 Published:2013-06-23
  • Contact: Tian, F.-Q.
  • About author:-
  • Supported by:
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摘要： 利用光学显微镜和透射电子显微镜研究了国产7020铝合金熔化极惰性气体保护焊(MIG)接头的微观组织结构,并对接头的力学性能进行研究.结果表明,接头的硬度以焊缝中心线为轴呈对称分布,且焊缝中心为接头的最薄弱环节;焊缝区为典型的树枝状晶的铸造组织.在熔合区,焊缝一侧为沿散热方向排列的柱状晶,另一侧为细小的等轴晶组织.热影响区内,仍可见纤维状加工痕迹,部分析出相固溶到基体中;强化相的粗化,是热影响区内出现软化区的主要原因.国产7020铝合金焊接接头强度达到欧洲标准.

关键词: 铝合金, 焊接接头, 显微组织, 力学性能

Abstract: The microstructure and mechanical properties of the joints welding domestic 7020 Al-alloy sheets together by use of metal inert gas (MIG) were investigated. It was found that the hardness distribution is symmetrical to the center line of welded joint, where is just the weakest zone of the whole joint to which the weld zone presents a typical dendritic casting structure. In the fusion zone, the columnar grains range in the direction of heat dissipation on one side of the joint and fine equiaxed grains on the other side. Fibrous processing marks remain in the heat-affected zone (HAZ) with part of precipitated solid phase solved into the base metal. Precipitate microstructure shows that the growth of precipitates is the main reason to soften the HAZ. The results showed that the tensile strength of the joints welding the 7020 Al-alloy sheets together exceeds the standard DIN EN288-4.

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