Experimental and numerical investigation of laser beam-welded Al-Cu-Li joints using micro-mechanical characteristics

被引:3
作者
Examilioti, Theano N. [1 ,2 ,3 ]
Papanikos, Paraskevas [4 ]
Kashaev, Nikolai [2 ]
Klusemann, Benjamin [1 ,2 ]
Alexopoulos, Nikolaos D. [3 ]
机构
[1] Leuphana Univ Luneburg, Inst Prod & Proc Innovat, D-21335 Luneburg, Germany
[2] Helmholtz Zentrum Hereon, Inst Mat Mech, D-21502 Geesthacht, Germany
[3] Univ Aegean, Dept Financial Engn, Res Unit Adv Mat, Chios 82132, Greece
[4] Univ Aegean, Dept Prod & Syst Design Engn, Syros 84100, Greece
来源
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T | 2022年 / 19卷
关键词
Al-Cu-Li alloy; Laser beam welds; Local mechanical properties; Microhardness; Microstructure; Finite element model; MECHANICAL-PROPERTIES; MICROSTRUCTURE; BEHAVIOR; PERFORMANCE; EVOLUTION;
D O I
10.1016/j.jmrt.2022.05.197
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The local tensile mechanical properties of laser beam-welded joints of AA2198 alloy with Al-Si filler wire were experimentally investigated. For this purpose, micro-flat tensile specimens were extracted from the fusion zone and the heat-affected zone. The chemical composition of the filler wire affects the local mechanical properties in the fusion zone, showing an approximately 26% decrease in yield strength from the radiation exposure side to the weld root side. The effect of post-weld heat treatment on the tensile mechanical behavior was additionally investigated for different heat treatment artificial ageing conditions. The maximum yield strength increase was noticed for 48 h of artificial ageing for the weld root side of the fusion zone. Several approximations were proposed to correlate the hardness measurements with the local tensile mechanical properties of the welded joint that allow for a fast assessment of the global tensile mechanical behaviour of the welded joint. To evaluate the effect of (i) artificial ageing and (ii) geometrical imperfections of the weld on the mechanical behavior of the welded joint, finite element analyses were performed, using the local mechanical properties as input to the model. It is shown that the local mechanical properties of the fusion zone play a pivotal role on the strain localization and fracture of the welded joint. (C) 2022 The Author(s). Published by Elsevier B.V.
引用
收藏
页码:2431 / 2446
页数:16
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