TC4钛合金搅拌摩擦焊连接组织形貌研究  

Microstructure of Friction Stir Weld for TC4 Titanium Alloy

作　　者：王快社[1] 张小龙[1] 沈洋[1] 徐可为[2] 

机构地区：[1]西安建筑科技大学,陕西西安710055 [2]西安交通大学金属材料强度国家重点实验室,陕西西安710048

出　　处：《稀有金属材料与工程》2008年第11期2045-2048,共4页Rare Metal Materials and Engineering

基　　金：国家自然科学基金项目(50774059);陕西省科技计划项目(2003K07-G8)资助

摘　　要：使用搅拌摩擦焊技术成功地实现了TC4(Ti-6Al-4V)钛合金的有效连接,并对焊接接头组织进行了研究。结合TC4钛合金搅拌摩擦焊的特点,分析了TC4钛合金搅拌摩擦焊接头焊合区的组织形貌及特征。结果表明:TC4钛合金搅拌摩擦焊接头焊合区组织为细密的等轴晶组织,焊接过程中焊缝最大温度并未超过相变温度,且经历了很大的塑性变形。焊缝与母材过渡区域存在大量α/β界面相及界面产物,α/β界面相及界面产物会对接头力学性能造成不良影响,应进行焊后热处理予以消除。Friction stir weld ability test for TC4 （Ti-6Al-4V） titanium alloy was carried out. The microstructure and characteristic of friction stir welds was analyzed in detail. The results show that the microstructure of the weld joint of TC4 titanium alloy friction stir welds exhibits refined equiaxial grains. There are a lot of α/β interface phases and its products in transitional zone between base material and weld nugget because the peak temperature in weld joint is lower than the transformation temperature and a great deformation during welding occurred in the joint, which will influence the mechanical properties of the joints. It is necessary to eliminate it by heat treatment after friction stir welding process.

关 键 词：搅拌摩擦焊 钛合金 组织形貌 α/β界面相 

分 类 号：TG453.9[金属学及工艺—焊接]