摘要
采用真空电子束焊接工艺焊接TC4钛合金,通过显微组织观察、显微硬度测试以及进行冲击试验,分析了焊接接头显微组织、性能以及焊缝中气孔的形成。结果表明:采用真空电子束焊焊接TC4合金时焊缝中有气孔产生,焊缝金属的硬度值比母材金属的高,但冲击值低于母材的;焊缝和热影响区中较粗大的原始β相一部分转变为过饱和的针状马氏体;焊缝中心有少量的针状α′相,并形成了编织状α组织。
TC4 alloy was welded by using vacuum electron beam welding process, through observing the microstructure, testing the microhardness and conducting the impact experiment, the microstructure and property of welded joints and the formation of porosities in the weld were analyzed. The results show that the porosities are formed in weld metal when TC4 alloy is welded by vacuum electron beam welding, the hardness value of weld metal is higher than that of the base metal, but the impact toughness value of the weld metal is lower than that of the base metal. The partial-coarse original β phase in the weld and HAZ metals are changed into the supersaturated acicular martensite. There are a little acicular α＇ phase in the middle of the weld metal and the interlaced α structure is formed.
出处
《热加工工艺》
CSCD
北大核心
2007年第15期24-26,共3页
Hot Working Technology
关键词
电子束焊接
TC4合金
焊接接头
组织
性能
electron beam welding
TC4 alloy
welded joint
microstructure
property
