TA2氩弧焊焊接接头组织和硬度测试.pdf

制造与安装
TA2弧焊焊接接头组织和硬度测试
田启发,孙宏飞',胡效东3
(1.山东科技大学材料科学与工程学院,山东青岛26590:2.山东科技大学信息科学与工程学
院,山东青岛266590;3.山东科技大学机械电子工程学院,山东青岛26590)
摘要:钛及钛合金具有较好的韧性和焊接性及耐腐蚀性能,在航空工业、化学工业等方面有着重要
用途。采用钨极氩弧焊方法(TG)制备焊接试样,分析母材区、熱影响区和焊缝区的显微组织、力
学性能。得出如下结论:TA2接头母材区的晶粒为Q等轴晶粒;过热区的晶粒粗大;熔合区两边晶
粒差别非常明显,焊缝区晶粒主要为马氏体组织与魏氏体组织;焊缝硬度整体呈M形,焊缝区的硬
度最低,热影响区的硬度最高;冷却过慢时,高温时间停留过长,晶粒会变粗大,也会降低材料塑性;
焊鏠区内杂质元素比母材低,在过热区产生较多的Fe-C化合物,杂质元素在辉缝区的元素分布
相对比较均
关键词:工业纯钛;显微组织;カ学性能;元素分布
中图分类号:TH140.2;TG146.2文献标识码:B文章编号:100-4837(201210-0060-07
doj:10.3969/j.1isn.1001-4837.2012.10.012
Microstructure and Mechanical Properties
of T]A2 Weld-joint with TIG
TIAN Qi-fa ", SUN Hong-fei, HU Xiao-dong
(1. School of Material Science and Engineering, Shandong University of Seience and Technology, Qingdao
266590, China; 2. College of Information Science and Engineering, Shandong University of Science and
Technology, Qingdao 266590, China 3. College of Mechanical and Electronic Engineering, Shandong Uni-
versity of Science and Technology, Qingdao 266590, China)
Abstract: Titanium alloy is widely used in chemical industries for the excellent ductility, weldability and
corrosion resistant. The welding joint studied is made with TA2 plate with the method of argon-arc weld
ing, and the relationships of microstructures, mechanical properties and element distributions in the differ-
ent parts of which have been studied with the metallic phase observation, hardness measurement and ele-
ment contents test Conclusions have heen obtained as following: Grains in the base metal zone are typical
a equiaxed grains, the grains in overheated zone are quite coarse, the organizations of the welding seam
are martensite and widmanstatten The hardness tendency of the weld joint is depicted as M-shape with
the softest point located at the center, and the hardest is located at the overheated zone: There are more
impurity element in the base metal than the weld seam, more Fe-c chemical compound is produced in
the over-heated zone than the weld seam, and the impurity element in the weld seam is more evenly distributed
基金项目:中国博上后科学基金(2012M51101