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

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第23卷    第z1期    总第1期    2013年12月

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文章编号:1004-0609(2013)S1-0678-06
原位自生(TiB+La2O3)/Ti复合材料脉冲氩弧焊接技术
毛建伟1,吕维洁1,黄 坚1,王立强1,张 荻1,覃继宁1,孙锡建2,朱晓星2

(1. 上海交通大学 金属基复合材料国家重点实验室,上海 200240;
2. 上海航天精密机械研究所,上海 201600
)

摘 要: 研究在脉冲氩弧焊条件下原位自生(TiB+La2O3)/Ti复合材料的焊接性能,对焊接接头进行金相和扫描电镜观察分析、室温拉伸实验及硬度测试,研究脉冲氩弧焊工艺对接头成形性和组织的影响,增强体在焊缝不同区域的存在形态与分布规律,及其对接头性能的影响。结果表明:通过优化焊接工艺参数,采用脉冲氩弧焊接工艺可以获得优质的焊接接头,接头组织致密,无气孔、夹杂和裂纹等焊接缺陷,接头成形性良好,与母材强度相比,接头抗拉强度没有大幅度下降,抗拉强度可达母材强度的95%,而接头塑性显著下降,这与焊缝中存在大量的马氏体α¢和呈网络状结构的TiB增强体有关。因此,脉冲氩弧焊接工艺是一种适合钛基复合材料的可靠连接技术。

 

关键词: 钛基复合材料;氩弧焊;脉冲电流;显微组织;力学性能

Pulsed argon arc welding of in situ synthesized (TiB+La2O3)/Ti composites
MAO Jian-wei1, LU Wei-jie1, WANG Li-qiang1, ZHANG Di1, QIN Ji-ning1, SUN Xi-jian2, ZHU Xiao-xing2

1. State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, China;
2. Shanghai Spaceflight Precision Machinery Research Institute, Shanghai 201600, China

Abstract:The weldability of in situ synthesized (TiB+La2O3)/Ti composites using pulsed arc welding technology was investigated. The effects of pulsed arc welding on the appearance of weld and joint microstructure were studied by optical microscopy, scanning electron microscopy, room tensile test and hardness measurement. The existing state and distribution of reinforcements at different weld zones, together with the mechanical properties of joints were also discussed. The results show that sound welded joint with compact and defect-free microstructure is obtained by the pulsed argon arc welding technology, and the joint presents good appearance of weld. Compared with the base metal, the joint exhibits no significant decrease in strength, and the tensile strength of welded joint can reach 95% of the base metal strength. However, the butt-joint ductility seriously decreases, which is ascribed to the formation of numerous martensite a ¢ phases and the network distribution of TiB in the weld. It can be determined that the pulsed argon arc welding technology is a reliable processing method for joining titanium matrix composites.

 

Key words: titanium matrix composites; gas tungsten arc welding; pulsed current; microstructure; mechanical properties

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

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

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