Q235钢板表面TIG法熔覆铜接头的组织和力学性能  

Microstructure and Mechanical Properties of Welding Joint of Cladding CuSi_3 on Q235 Steel substrate using TIG Method

作　　者：禹业晓[1] 李玉龙[1] 徐健宁[1] 孙煜杰[1] 

机构地区：[1]南昌大学机电工程学院机器人与焊接自动化重点实验室,南昌330031

出　　处：《航空材料学报》2014年第1期62-68,共7页Journal of Aeronautical Materials

基　　金：江西省青年科学家资助项目(2010DQ01000);江西省教育厅科技项目(GJJ13064)

摘　　要：采用TIG堆焊方法在Q235钢板上堆焊铜合金。通过光学显微镜、扫描电镜观察了接头界面的组织形貌,分析了焊接工艺对铜合金层中泛铁量的影响;通过显微硬度计对堆焊接头的硬度分布以及焊接工艺对显微硬度的影响进行了分析。结果表明:铜合金层和界面的成分发生了变化,发现基体元素向铜合金层中熔解产生不同形状的泛铁相;堆焊层硬度由于微观组织的不均匀性和Fe元素的含量及分布具有很大的波动,平均显微硬度随焊接热输入的增加而增大。Surface cladding of copper on Q235 steel substrate was conducted by using a TIG deposition method. Microstructure characteristic of the cladding layer and the distribution regularity of the Fe in the deposited layer were investigated by using an optical microscopy and a scanning electron microscopy （SEM） installed with an energy dispersive spectrometer （EDS）. The results show the dissolution of the steel substrate induces the formation of the Fe-rich phase according to the EDS analysis across the interface. The uniformity of microstructure and the distribution of Fe element have great influence on the hardness. The average microhardness of the deposited layer increases with the enhancing of the welding heat input.

关 键 词：Q235钢 硅青铜 TIG堆焊 组织性能 

分 类 号：TG454[金属学及工艺—焊接]