Effect of joint line remnant on fatigue lifetime of friction stir welded Al-Cu-Li alloy

被引：38
|
作者：
Le Jolu, T. [1 ]
Morgeneyer, T. F. [1 ]
Gourgues-Lorenzon, A. F. [1 ]
机构：
[1] MINES ParisTech, Ctr Mat, CNRS, UMR 7633, F-91003 Evry, France
来源：
SCIENCE AND TECHNOLOGY OF WELDING AND JOINING | 2010年 / 15卷 / 08期
关键词：
Friction stir welding; Fatigue; Joint line remnant; Al-Cu-Li; RESIDUAL-STRESS; KISSING-BOND; CRACK GROWTH; MICROSTRUCTURE; PROPERTY; BEHAVIOR;
D O I：
10.1179/136217110X12813393169453
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The effect of joint line remnant (JLR) on the fatigue lifetime of friction stir welds of a 2198 Al alloy in T851 condition has been assessed experimentally. The base material, sound welds (welded in one sheet) and welds with JLR (produced via welding of two sheets with a natural oxide layer) have been investigated. A strong decrease in microhardness is found for the weak weld zone that is consistent with the reduction in tensile properties compared to the base material: 45% in yield strength and 22% in ultimate tensile strength. The fatigue strengths of sound and JLR bearing welds at 100 000 cycles (R=0.1) are reduced by 10 and 15% respectively compared to the base material. Only for one-third of the JLR bearing specimens, the fatigue crack initiated in regions close to the JLR and this without reduction in fatigue lifetime.
引用
收藏
页码：694 / 698
页数：5
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