Effect of Forced Cooling on Microstructure and Mechanical Property of Friction Stir Welded Joint of TC4 Titanium Alloy

被引：0

作者：

Wang Wen ^{[1
]}

Li Yao ^{[2
]}

Hao Yaxin ^{[1
]}

Wang Qingjuan ^{[1
]}

Wang Kuaishe ^{[1
]}

Hai Minna ^{[1
]}

机构：

[1] Xian Univ Architecture & Technol, Xian 710055, Peoples R China

[2] Xian Aircraft Int Corp, Xian 710089, Peoples R China

来源：

RARE METAL MATERIALS AND ENGINEERING | 2015年 / 44卷 / 11期

关键词：

friction stir welding; TC4 titanium alloy; microstructure; mechanical property; forced cooling; TI-6AL-4V ALLOY; TI;

D O I：

暂无

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

TC4 titanium alloy plate was friction stir welded (FSW) in air and forced cooling condition separately, and microstructure and mechanical properties of the joints were investigated. The result shows that FSW joint consists of stir zone, thermo-mechanically affected zone and base material. Base material annealed after heat rolling is characterized by primary alpha and beta phase. Stir zone is fully lamellar alpha+beta structure, which is mainly controlled by phase transformation from beta monophase to lamellar alpha+beta phase in air. Thermo-mechanically affected zone exhibits bimodal microstructure of equiaxed alpha grain and alpha+beta lamellar. Its transformation characteristic is dynamic recrystallization and phase transformation. Stir zone is characterized by acicular martensite in forced cooling condition, which is mainly controlled by martensite transformation. The microhardness of FSW joint welded in forced cooling condition is significantly higher than that welded in air, but its ultimate tensile strength is slightly lower.

引用

页码：2842 / 2846

页数：5

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