Investigation of microstructure, surface and subsurface characteristics in titanium alloy friction stir welds of varied thicknesses

被引：89

作者：

Edwards, P. D. ^{[1
,2
]}

Ramulu, M. ^{[1
]}

机构：

[1] Univ Washington, Seattle, WA 98195 USA

[2] Boeing Co, Seattle, WA 98124 USA

来源：

SCIENCE AND TECHNOLOGY OF WELDING AND JOINING | 2009年 / 14卷 / 05期

关键词：

Friction stir welding; Titanium; Microstructure; Microhardness; 6AL-4V;

D O I：

10.1179/136217109X425838

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Friction stir welding of titanium alloy (Ti-6Al-4V) was demonstrated on 3, 6, 9 and 12 mm thickness square groove butt joints. Complete microstructural and microhardness evaluations were conducted in addition to surface and subsurface examinations for each case. The 3 mm welds exhibited an extremely fine grained microstructure with evidence of processing temperatures below the beta transus temperature of the alloy. The 6, 9 and 12 mm samples possessed larger grains formed by a slower cooling rate from above the beta transus temperatures. The thick section weld exhibited a nearly uniform microhardness, while the thinner welds showed a slight, 6%, increase in hardness compared with the parent material.

引用

页码：476 / 483

页数：8

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