Effects of intense cooling on microstructure and properties of friction-stir-welded Ti-6Al-4V alloy

被引：15
作者：
Liu, Zhenlei [1 ]
Wang, Yue [1 ]
Ji, Shude [1 ]
Li, Zhengwei [2 ]
机构：
[1] Shenyang Aerosp Univ, Fac Aerosp Engn, Shenyang 110136, Liaoning, Peoples R China
[2] Harbin Inst Technol, State Key Lab Adv Welding & Joining, Harbin, Heilongjiang, Peoples R China
来源：
MATERIALS SCIENCE AND TECHNOLOGY | 2018年 / 34卷 / 02期
关键词：
Friction stir welding; Ti-6Al-4V titanium alloy; cooling liquid nitrogen; microstructure; mechanical properties; 2219-T6; ALUMINUM-ALLOY; MECHANICAL-PROPERTIES; TENSILE PROPERTIES; TEXTURE EVOLUTION; BUTT JOINTS; STEEL; TEMPERATURE; UNDERWATER;
D O I：
10.1080/02670836.2017.1366739
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Friction stir welding (FSW) was used to join Ti-6Al-4V alloy in air and under intense cooling conditions. The results show that the application of liquid nitrogen is beneficial in decreasing the peak temperature and in reducing the extent of the high-temperature region during welding, leading to a smaller stir zone (SZ). Intense cooling can lead to refined and homogeneous grains in the SZ, resulting in increased microhardness. The FSW joint produced with intense cooling had a tensile strength of 1018.3 MPa, which is nearly equivalent to that of the base material and is up to 2.6% higher than for the air-cooled joint. The fractographs for both types of joint were characterised by dimples, indicating that the fractures were ductile.
引用
收藏
页码：209 / 219
页数：11
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