Effect of welding parameters on mechanical and fatigue properties of friction stir welded 2198 T8 aluminum–lithium alloy joints

E, Yu; Xia, Z.C.; Jiang, Ruisong; Li, Wenya

doi:10.1016/j.engfracmech.2013.10.010

Cited by 76 publications

(38 citation statements)

References 24 publications

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“…It is found that the UTS and YS values have significant dependence on the volume fraction of T1 phase across the welds. The overall trends of UTS and YS variations across the welds are consistent with the results of Ma et al [12] for the same Al-Li alloy. Specifically, in the BM and HAZ, the higher volume fraction of T1 phase gives rise to higher UTS and YS, whereas in the weld centre the volume fraction of T1 phase remarkably declines to zero and thus brings about approximately 200 MPa loss of UTS and YS in the SpZ and SsZ.…”

Section: Relationship Between Microstructures and Mechanical Propertiessupporting

confidence: 90%

“…Wei [11] produced FSW joints of 1420 alloy plates using different welding parameters and found that the maximum ultimate strength of the joints is equivalent to 86% of the strength of base material. Ma [12] studied the influence of FSW parameters on the mechanical properties of the 2198-T8 welded samples and concluded that the mechanical properties of the joints decreased with increasing ratio of rotation speed (ω) and travel speed (υ). Cavaliere [13] studied the friction stir welds of AA2198-T851 alloy and observed the presence of θ′ and δ′ phases in the weld nugget and T1, θ′ and δ′ in the HAZ and TMAZ.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Correlation of microstructure and mechanical properties in friction stir welded 2198-T8 Al–Li alloy

Gao

Zhu

Han

et al. 2015

Materials Science and Engineering: A

105

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Section: Relationship Between Microstructures and Mechanical Propertiessupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Correlation of microstructure and mechanical properties in friction stir welded 2198-T8 Al–Li alloy

Gao

Zhu

Han

et al. 2015

Materials Science and Engineering: A

105

View full text Add to dashboard Cite

“…Steuwer [16] et al studied the microstructure mapping of the weld for FSWing 2199Al-Li alloy. Ma [17] et al summarized that the ultimate tensile strength of the FSWed joints in 2198-T8 Al-Li alloy decreased with increasing rotation speed or decreasing welding speed. But Radisavljevic [18] concluded that the tensile strength of FSWed AA2024-T351 joints decreased when increasing welding speed.…”

Section: Introductionmentioning

confidence: 99%

Effect of welding parameters on microstructure and mechanical properties of friction stir welded joints of 2060 aluminum lithium alloy

Mao

Liu

et al. 2015

Int J Adv Manuf Technol

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Two-millimeter-thick 2060 Al-Li alloy plates were friction stir welded under a welding speed of 95-150 mm/min and rotation speed of 750-1500 rpm. The effects of welding speed and rotation speed on formation quality, microstructure, secondary phase particles' transformation, and mechanical properties of the joints were investigated. The results show that defect-free joints are produced for varying friction stir welding (FSW) parameters, and nugget size increases firstly and then decreases with increasing rotation speed or decreasing welding speed. The weld nugget zones (WNZs) have fine dynamically recrystallized grains, and the size decreases to 7.9 μm with increasing rotation speed to 1180 rpm or decreasing welding speed to 118 mm/min, while the grains are coarsened at 1500 rpm or 95 mm/min. A similar trend occurs in the transformation of secondary phase particles, whose size is the smallest in WNZ at 1180 rpm-118 mm/min. All joints exhibit softened zones where the hardness is the lowest, and the joints fracture from WNZs or heat-affected zones. The joints welded at 1180 rpm-118 mm/min perform the highest ultimate tensile strength of 495 MPa, yield strength of 380 MPa, and elongation of 10.2 %. With increasing rotation speed or decreasing welding speed, the strengths and elongation of the joints increase firstly and then decrease.

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“…10. For traditional FSW joint, it is widely acceptable that the tensile fracture is likely to occur at the defect position or minimum hardness location [34]. Furthermore, in terms of VCFSW process, the degree of mixture of two materials also plays a more significant role in the tensile fracture of joint.…”

Section: Mechanical Property Of Jointmentioning

confidence: 99%

Investigation of vertical compensation friction stir-welded 7N01-T4 aluminum alloy

Meng

et al. 2015

Int J Adv Manuf Technol

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Vertical compensation friction stir welding (VCFSW) is successfully applied to weld 7N01-T4 aluminum alloy, and effects of welding speed on joint quality are investigated. The results show that when compensation strip width is 1 mm, the defect-free joint is obtained at the welding speed of 50 mm/min and constant rotational velocity of 2000 rpm. Moreover, the intercalation lamellae structure formed in nugget zone (NZ) can reveal material flow behavior clearly. As strip width increases to 1.5 mm, it is difficult to attain sound joint. Decreasing welding speed is beneficial to surface formation of VCFSW joint. The increase of welding speed decreases tensile strength and elongation of joint. At the welding speed of 50 mm/min and strip width of 1 mm, the tensile strength and elongation of VCFSW joint are 295.7 MPa and 6.7 %, equivalent to 66 and 39.4 % of BM, respectively, while fracture surface of joint presents typical ductile fracture. The hardness distribution of joint shows typical W shape, and the hardness of NZ exhibits uniform distribution.

show abstract

Effect of welding parameters on mechanical and fatigue properties of friction stir welded 2198 T8 aluminum–lithium alloy joints

Cited by 76 publications

References 24 publications

Correlation of microstructure and mechanical properties in friction stir welded 2198-T8 Al–Li alloy

Correlation of microstructure and mechanical properties in friction stir welded 2198-T8 Al–Li alloy

Effect of welding parameters on microstructure and mechanical properties of friction stir welded joints of 2060 aluminum lithium alloy

Investigation of vertical compensation friction stir-welded 7N01-T4 aluminum alloy

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