Comparison of the microstructure and mechanical performance of 2A97 Al-Li alloy joints between autogenous and non-autogenous laser welding

Ning, Jie; Zhang, Linjie; Bai, Qing-Lin; Yin, Xianqing; Jing, Niu; Zhang, Jianxun

doi:10.1016/j.matdes.2017.02.003

Cited by 82 publications

(15 citation statements)

References 28 publications

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“…The upper part of the samples had been heated to higher temperatures than the lower one. This had been typical for laser welding of aluminium–lithium alloys 15,42, 43 . The mechanism of the FQZ formation was described in detail by Hu et al 44 The authors also presented the data that failure had occurred through this zone during the static tensile test.…”

Section: Resultsmentioning

confidence: 80%

Effect of temperature on the fracture behaviour of heat‐treated Al–Cu–Li alloy laser welds under low‐cycle fatigue loading

Маликов

Karpov

Orishich

2020

Fatigue Fract Eng Mat Struct

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The paper presents the results of the studies of the effect of temperature on the fracture behaviour of Al-Cu-Li alloy laser welds under low-cycle fatigue loading. The mechanical properties and the microstructure of the welded joints without and after postweld heat treatment (PWHT) were investigated. The tensile strength and the low-cycle fatigue resistance of the welded joints were studied at various test temperatures (20 C, 85 C and − 60 C). It was been found that heating up to 85 C and cooling down to −60 C reduced the maximum number of loading cycles of the welded joints after PWHT by 1.5-2.0 times compared with that at a test temperature of 20 C. K E Y W O R D Saluminium-lithium alloy, fatigue strength, heat treatment, laser welding, microstructure, tensile strength

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Section: Resultsmentioning

confidence: 80%

Effect of temperature on the fracture behaviour of heat‐treated Al–Cu–Li alloy laser welds under low‐cycle fatigue loading

Маликов

Karpov

Orishich

2020

Fatigue Fract Eng Mat Struct

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“…The elongation rate of the welded joint W wider is about 80.9% that of the base metal, slightly larger than that of the welded joint W narrower , which is up to 72% that of base metal. This might because that the joint W wider has a larger weld width and can endure a greater deformation [26]. Both joints fractured in the FZ during tensile processes.…”

Section: Mechanical Property Testmentioning

confidence: 99%

Study on the Size Effects of H-Shaped Fusion Zone of Fiber Laser Welded AZ31 Joint

Zhang

et al. 2018

Metals

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There are two kinds of typical cross-section profiles for the fusion zone (FZ) of a laser welded thin section joint, i.e., a V-shaped cross-section and an H-shaped cross-section. Previous researches indicated that tensile strength of the V-shaped joint was lower than that of the H-shaped one due to the greater heterogeneity of strain distribution on the V-shaped joint during tensile process. In this work, impacts of the aspect ratio of FZ on the mechanical properties of laser welded thin section joints with an H-shaped cross-section profile were investigated. Welding conditions corresponding to two typical H-shaped joints (i.e., W narrower with a narrower FZ, and W wider with a wider FZ) were decided through a laser welding orthogonal experimental plan. Then, the microstructure and properties of both joints were examined and compared. The results show that the tensile strength of joint W narrower and joint W wider was about 72% and 80.9% that of the base metal, respectively. Both joints fractured in the FZ during tensile processes. The low-cycle fatigue life of the base metal, the joint W narrower and the joint W wider were 3377.5 cycles, 2825 cycles and 3155.3 cycles, respectively. By using high-speed imaging, it was found that the fatigue crack of joint W narrower initiated and propagated inside the fusion zone, while the fatigue crack of the joint W wider initiated at the edge of the base metal and propagated for a distance within the base metal before entering into the fusion zone. This work promoted our understanding about the influence of the weld bead shape on the properties of laser welded thin section joints.

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“…It is worth noting that the Al-Li alloy 2060/2099 is a typical precipitate strengthened alloy [16,17], and laser beam welding consists of rapid heating and cooling, which leaves insufficient time for precipitation of alloy elements in the FZ [18]. As a result, the generation of precipitation phases was reduced compared with that of the base materials and the FZ remained in an under aged condition, resulting in ineffective aging strengthening and reduced micro-hardness at the FZ [18]. Therefore, the micro-hardness of the heat-affected zone (HAZ) degraded as a consequence of AA.…”

Section: Effects Of Post-weld Heat Treatment On Micro-hardnessmentioning

confidence: 99%

Influence of Post-Weld Heat Treatments on Microstructure and Mechanical Properties of Laser Beam Welded 2060-T3/2099-T3Al-Li T-Joints

Zhang

Chen

Wang

et al. 2019

Metals

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The durable structure and robustness of T-joints in the panel materials for civil aircraft are a crucial matter of importance. In this work, the impact of the post-weld heat treatments (PWHTs) on the microstructure and mechanical properties of laser beam welded T-joints of 2060-T3/2099-T3 Al-Li alloy was analyzed. Heat-treatment of the laser beam welded T-joints was carried out in two different ways, namely, solution treatment and artificial aging (STAA) at varied duration and only artificial aging (AA) at varied duration. The microstructure and mechanical properties of the heat-treated joints were investigated using metallographic and scanning electron microscopic images, micro-hardness test, and tensile test, respectively. The results showed that, in cases of STAA, the eutectic structures on the grain boundary were partially dissolved via solution treatment (ST), and increased dispersed precipitation of the second phase in matrix resulted in significant dispersion strengthening, as well as enhanced strength and plasticity. In contrast, in the AA process, alloy elements in the matrix continued to segregate towards the grain boundary, resulting in significant grain boundary strengthening, enhanced strength, and decreased plasticity. Additionally, joint fractures were micro-porous aggregation transgranular ones in the fusion zone (FZ). The joints treated by STAA exhibited excellent plasticity compared with those treated by AA. Furthermore, the micro-hardness of welded joints treated by AA was higher than that of those treated by STAA. Indeed, the tensile strength of joints treated by STAA and AA ranged from 405 to 475 MPa, which was 81–95% of the base metal 2060-T8, though the elongation of joints treated by STAA was superior to the counterpart AA.

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Comparison of the microstructure and mechanical performance of 2A97 Al-Li alloy joints between autogenous and non-autogenous laser welding

Cited by 82 publications

References 28 publications

Effect of temperature on the fracture behaviour of heat‐treated Al–Cu–Li alloy laser welds under low‐cycle fatigue loading

Effect of temperature on the fracture behaviour of heat‐treated Al–Cu–Li alloy laser welds under low‐cycle fatigue loading

Study on the Size Effects of H-Shaped Fusion Zone of Fiber Laser Welded AZ31 Joint

Influence of Post-Weld Heat Treatments on Microstructure and Mechanical Properties of Laser Beam Welded 2060-T3/2099-T3Al-Li T-Joints

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