Narrow-gap tungsten inert gas welding of 78-mm-thick Ti-6Al-4V alloy

被引：13
|
作者：
Wan, L. [1 ]
Huang, Y. [1 ]
Lv, S. [1 ]
Huang, T. [1 ]
Li, C. [1 ]
Feng, J. [1 ]
机构：
[1] Harbin Inst Technol, State Key Lab Adv Welding & Joining, Harbin 150001, Peoples R China
来源：
MATERIALS SCIENCE AND TECHNOLOGY | 2016年 / 32卷 / 15期
基金：
中国国家自然科学基金;
关键词：
Titanium alloy; Narrow-gap welding; TIG; Microstructure; Mechanical property; MECHANICAL-PROPERTIES; TITANIUM-ALLOY; TI6AL4V ALLOY; ALPHA-PHASE; MICROSTRUCTURE; JOINTS; HETEROGENEITY; BEHAVIOR; PLATE;
D O I：
10.1080/02670836.2015.1131941
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Narrow-gap tungsten inert gas welding with in situ protective system is applied to 78-mm-thick Ti-6Al-4V alloy. The martensite basketweave microstructure is formed in fusion zone (FZ), and heat-affected zone (HAZ) near FZ consists of acicular martensite and a small portion of primary alpha phase. The HAZ near base metal (BM) consists of primary alpha and transformed beta phase. Microhardness values of FZ and HAZ are relatively higher, and peak values appear at HAZ near FZ. The mechanical heterogeneity is dependent on variation of beta phase and martensite, which in turn depend on specific thermal cycle(s). The average tensile strength reaches 783.3 MPa and is 91.2% of BM, which appears in the middle of the weld with orthogonal martensites.
引用
收藏
页码：1545 / 1552
页数：8
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