Effect of post weld artificial aging and water cooling on microstructure and mechanical properties of friction stir welded 2198-T8 Al-Li joints

Tao, Ye; Zhang, Z.; Xue, P.; Ni, D.R.; Xiao, B.L.; Ma, Z.Y.

doi:10.1016/j.jmst.2022.01.020

Cited by 34 publications

(11 citation statements)

References 76 publications

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“…7a), resulting in a bigger error value of the UTS due to the abnormal fracture. Previous researchers found that the JLR was characterized as a highdensity Al 2 O 3 particles formed during FSW [12,29,44,45]. Tao et al [29] found the conventional FSW joint failed along the JLR, leading to significantly reduced ductility.…”

Section: Microstructure and Mechanical Propertiesmentioning

confidence: 99%

Enhanced Fatigue Properties of 2219 Al Alloy Joints via Bobbin Tool Friction Stir Welding

Wang

Zhang

et al. 2022

Acta Metall. Sin. (Engl. Lett.)

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In the present study, 2219-T87 Al alloy plates, 4 mm in thickness, were subjected to bobbin tool friction stir welding (BT-FSW) under relatively high welding speeds of 200 and 400 mm/min, with the aim to analyze the effect of welding speeds on fatigue properties of the joints. The results showed that the tension-tension high-cycle fatigue performance of the BT-FSW joints at room temperature was significantly enhanced compared to that of other joints of 2xxx series Al alloys counterparts. Particularly at a high welding speed of 400 mm/min, the fatigue strength of the joint reached 78% of the base material together with a high tensile strength of 311 MPa. It was found that the joint line remnants had no effects on the fatigue properties of the BT-FSW joints due to the elimination of root flaws under the action of the lower shoulder. Most of the samples with the welding speed of 200 mm/min failed at the thermo-mechanical zone (TMAZ) during fatigue tests, attributable to the coarsened grains and precipitates, but all of the samples with high welding speed of 400 mm/min randomly failed at the nugget zone due to the improved hardness value in the TMAZ.

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Section: Microstructure and Mechanical Propertiesmentioning

confidence: 99%

Enhanced Fatigue Properties of 2219 Al Alloy Joints via Bobbin Tool Friction Stir Welding

Wang

Zhang

et al. 2022

Acta Metall. Sin. (Engl. Lett.)

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“…Furthermore, a higher Cu/Li ratio seems to produce a more rapid nucleation of T1 in low-Li Al-Cu-Li alloys [16]. The introduction of welding in Al-Cu-Li alloy structures offers significant positive effects, such as lower weight and improved performance, while replacing conventional joining techniques [17,18]. Regarding the AA2198 alloy, two welding methods are usually utilized: Friction Stir Welding (FSW) [17,[19][20][21][22][23][24][25][26][27] and laser welding methods [18,[28][29][30][31].…”

Section: Introductionmentioning

confidence: 99%

“…The introduction of welding in Al-Cu-Li alloy structures offers significant positive effects, such as lower weight and improved performance, while replacing conventional joining techniques [17,18]. Regarding the AA2198 alloy, two welding methods are usually utilized: Friction Stir Welding (FSW) [17,[19][20][21][22][23][24][25][26][27] and laser welding methods [18,[28][29][30][31]. Studies have confirmed the positive effect of micro-jet cooling for the welding of Al alloys [32,33].…”

Section: Introductionmentioning

confidence: 99%

“…During the LBW of AA2198, a significant decrease in mechanical properties is observed near the Weld Zone (WZ) [17,34]. This is attributed to the fact that AA2198 is a heattreatable alloy, and the mechanical properties depend mainly on the size and distribution of strengthening precipitates.…”

Section: Introductionmentioning

confidence: 99%

“…The microstructural changes due to the welding thermal cycles, such as the coarsening or dissolution and re-precipitation of certain phases or precipitates, significantly affect the mechanical properties of an AA2198 weld [18]. Even after optimizing welding parameters, strength loss in alloy welds is considered inevitable [17]. During the welding of AA2198, the phases T1, δ', S' and θ' are completely dissolved in the Al matrix, and after cooling, they re-precipitate [17,24].…”

Section: Introductionmentioning

confidence: 99%

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Experimental and Computational Study of Microhardness Evolution in the HAZ for Al–Cu–Li Alloys

Maritsa,

Deligiannis,

Tsakiridis

et al. 2024

Crystals

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The Laser Beam Welding (LBW) of aluminum alloys has attracted significant interest from industrial sectors, including the shipbuilding, automotive and aeronautics industries, as it expects to contribute to significant cost reduction associated with the production of high-quality welds. To comprehend the behavior of welded structures in regard to their damage tolerance, the application of fracture mechanics serves as the instrumental tool. However, the methods employed overlook the changes in the microstructure within the Heat-Affected Zone (HAZ), which leads to the degradation of the mechanical properties of the material. The purpose of this study is to simulate microhardness evolution in the HAZ of AA2198-T351 LBW. The material represents the latest generation of Al-Cu-Li alloys, which exhibit improved mechanical properties, enhanced damage tolerance behavior, lower density and better corrosion and fatigue crack growth resistance than conventional Al-Cu alloys. In this work, the microhardness profile of LBW AA2198 was measured, and subsequently, through isothermal heat treatments on samples, the microhardness values of the HAZ were replicated. The conditions of the heat treatments (T, t) were selected in line with the thermal cycles that each area of the HAZ experienced during welding. ThermoCalc and DICTRA were employed in order to identify the strengthening precipitates and their evolution (dissolution and coarsening) during the weld thermal cycle. The microstructure of the heat-treated samples was studied employing LOM and TEM, and the strengthening precipitates and their characteristics (volume fraction and size) were defined and correlated to the calculations and the experimental conditions employed during welding. The main conclusion of this study is that it is feasible to imitate the microstructure evolution within the HAZ through the implementation of isothermal heat treatments. This implies that it is possible to fabricate samples for fatigue crack growth tests, enabling the experimental examination of the damage tolerance behavior in welded structures.

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Influence of Friction Stir Weld Seam Distribution on Spun Formed Workpieces

Sun,

Wang,

Gao

et al. 2024

Int. J. Precis. Eng. Manuf.

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Effect of post weld artificial aging and water cooling on microstructure and mechanical properties of friction stir welded 2198-T8 Al-Li joints

Cited by 34 publications

References 76 publications

Enhanced Fatigue Properties of 2219 Al Alloy Joints via Bobbin Tool Friction Stir Welding

Enhanced Fatigue Properties of 2219 Al Alloy Joints via Bobbin Tool Friction Stir Welding

Experimental and Computational Study of Microhardness Evolution in the HAZ for Al–Cu–Li Alloys

Influence of Friction Stir Weld Seam Distribution on Spun Formed Workpieces

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