Study on the mechanical heterogeneity of electron beam welded thick TC4-DT joints

被引:32
作者
Lu, Wei [1 ]
Li, Xiaoyan [1 ]
Lei, Yongping [1 ]
Shi, Yaowu [1 ]
机构
[1] Beijing Univ Technol, Coll Mat Sci & Engn, Beijing 100124, Peoples R China
来源
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2012年 / 540卷
关键词
Electron beam welding; Damage-tolerant Ti-6Al-4V; Mechanical properties; GAS TUNGSTEN ARC; TI-6AL-4V ALLOY; HEAT-TREATMENT; TITANIUM;
D O I
10.1016/j.msea.2012.01.117
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Tensile properties and microhardness of electron beam welded thick damage-tolerant Ti-6Al-4V joints with the weld cross-section of parallel shaped and taper shaped configurations were examined. Moreover, the mechanical heterogeneity along the weld depth was studied. The results indicate that for both the shaped joints, the weld metal exhibits increased strength and microhardness, while decreased ductility and toughness as compared with the base metal. The mechanical properties of the weld metal are heterogeneous along the weld depth. With the increase of weld depth, the strength and microhardness increase. The weld middle position has smaller mechanical heterogeneity than the weld top and weld root. Moreover, the heterogeneity of parallel shaped welds along the weld depth is lower than that of taper shaped welds. It is also found that the change of mechanical properties such as strength and microhardness has microstructure dependent trend. The mechanical heterogeneity along the weld depth is dependent on the grain size change of beta phase and martensite. (C) 2012 Elsevier B.V. All rights reserved.
引用
收藏
页码:135 / 141
页数:7
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