Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

您目前所在的位置:首页 - 期刊简介 - 详细页面

中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第18卷    第6期    总第111期    2008年6月

[PDF全文下载]        

    

文章编号:1004-0609(2008)06-0959-08
微量元素对高强铝合金焊缝组织和力学性能的影响
许良红,田志凌,彭 云,张晓牧

(钢铁研究总院 先进钢铁流程及材料国家重点实验室,北京100081)

摘 要: ER2319焊丝的基础上,分别添加少量CeCrMn元素制备了3种焊丝。采用光学显微镜、扫描电镜和能谱分析技术研究微量元素CeCrMnMIG焊缝组织和性能的影响。结果表明:Ce能够细化二次枝晶间距,但Ce易与TiZr相互反应在晶界生成块状硬而脆的AlCuCeTiZrV复杂金属间化合物,降低了TiZr的异质形核作用,使焊缝组织成柱态。而CrMn则能促进Al3TiAl3Zr以及复合析出物Al3(Zr, Ti)的析出,增加这些颗粒在高温条件下的稳定性,能够显著细化焊缝晶粒和晶界共晶相,提升接头的力学性能。但Mn的含量达到0.58%时,焊缝中心容易形成粗大树枝晶。

 

关键词: 高强铝合金;微量元素;形核;等轴晶

Effects of trace elements on microstructure and mechanical properties of high strength aluminum alloy welds
XU Liang-hong, TIAN Zhi-ling, PENG Yun, ZHANG Xiao-mu

State Key Laboratory of Advanced Steel Processes and Products, Centre Iron & Steel Research Institute, Beijing 100081, China

Abstract:On the basis of ER2319 filler wire, three filler wires were prepared by adding Ce, Cr and Mn elements. The effects of these trace elements on the microstructure and mechanical properties of MIG welds were investigated by optical microscopy, scanning electron microscopy and energy dispersive spectrum. The results indicate that the addition of Ce can refine the second dendrite arm spacing, but it is easy to form AlCuCeTiZrV complex intermetallic compound at the grain boundary, which will reduce the refinement efficiency of the Ti and Zr inoculants, and make the morphology of the welds microstructure to be columnar. Cr and Mn are proved to improve the refinement efficiency of the Ti and Zr inoculants by increasing the precipitation of Al3Ti, Al3Zr and Al3(Zr, Ti) particles and the stability of these particles under high temperature conditions, which will result in the finer grains and eutectic phase in weld centre and the higher mechanical properties of the welds. When the amount of Mn is 0.58%(mass fraction), the coarse dendrite grains form in the weld centre.

 

Key words: high strength aluminum alloy; trace elements; nucleation; equiaxed grain

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

主管:中国科学技术协会 主办:中国有色金属学会 承办:中南大学
湘ICP备09001153号 版权所有:《中国有色金属学报》编辑部
------------------------------------------------------------------------------------------
地 址:湖南省长沙市岳麓山中南大学内 邮编:410083
电 话:0731-88876765,88877197,88830410   传真:0731-88877197   电子邮箱:f_ysxb@163.com