Effect of Travel Speed on Microstructure and Mechanical Properties of FSW Joints for Al–Zn–Mg Alloy

Lin, Sen; Tang, Jianguo; Liu, Shengdan; Deng, Yunlai; Lin, Huaqiang; Hua, Jianmin; Ye, Lingying; Zhang, Xinming

doi:10.3390/ma12244178

Cited by 11 publications

(7 citation statements)

References 51 publications

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“…σ a = 504.37(ε p ) 0.068 (6) The obtained value of the cyclic strength coefficient (504.37 MPa) is almost three times lower than for the base material (1518.1 MPa) [52]. Although, the decrease of cyclic strength coefficient is expected for welded joints, in this case, the reported drop is significant and the obtained value is similar to the values reported by research [31,36,[55][56][57].…”

Section: Low Cycle Fatigue Properties and Fracture Surface Observationssupporting

confidence: 82%

“…Friction stir welding (FSW) is a very efficient technology in the production of aluminum alloy joints, as it provides a number of advantages over traditional fusion welding such as the lower temperature of the joining process [1][2][3]. This particular factor is crucial when it comes to welding of high-strength aluminum alloys, which are mainly precipitated-hardening materials (2XXX and 7XXX series) and their specific strength is an effect of thermally unstable precipitates (e.g., Guinier-Preston zones, θ phase) [4][5][6][7]. Considering the production of efficient welds of these materials, the losses in hardening must be taken into account due to the thermal affection of the joining process on the workpiece.…”

Section: Introductionmentioning

confidence: 99%

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Research on the Properties and Low Cycle Fatigue of Sc-Modified AA2519-T62 FSW Joint

et al. 2020

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The aim of this research was to examine the mechanical and fatigue properties of friction stir welded Sc-modified 5 mm thick AA2519-T62 extrusion. The joint was obtained using the following parameters: 800 rpm tool rotation speed, 100 mm/min tool traverse speed, 17 kN axial, and MX Triflute as a tool. The investigation has involved microstructure observations, microhardness distribution analysis, tensile test with digital image correlation technique, observations of the fracture surface, measurements of residual stresses, low cycle fatigue testing, and fractography. It was stated that the obtained weld is defect-free and has joint efficiency of 83%. The failure in the tensile test occurred at the boundary of the thermo-mechanically affected zone and stir zone on the advancing side of the weld. The residual stress measurements have revealed that the highest values of longitudinal stress are localized at the distance of 10 mm from the joint line with their values of 124 MPa (the retreating side) and 159 MPa (the advancing side). The results of low cycle fatigue testing have allowed establishing of the values of the cyclic strength coefficient (k′ = 504.37 MPa) and cyclic strain hardening exponent (n′ = 0.0068) as well as the factors of the Manson–Coffin–Basquin equation: the fatigue strength coefficient σ′f = 462.4 MPa, the fatigue strength exponent b = −0.066, the fatigue ductility coefficient ε′f = 0.4212, and the fatigue ductility exponent c = −0.911.

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Section: Low Cycle Fatigue Properties and Fracture Surface Observationssupporting

confidence: 82%

Section: Introductionmentioning

confidence: 99%

Research on the Properties and Low Cycle Fatigue of Sc-Modified AA2519-T62 FSW Joint

et al. 2020

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“…Tool rotational speed (TRS) and welding speed (WS) are the parameters that influence the weld joint quality. 64,65 However, tilt angle (TA), axial load (P), plunge depth (PD), etc. were also considered by many authors to attain superior welds.…”

Section: Fsw Factorsmentioning

confidence: 99%

Friction stir welding of dissimilar alloy combinations—A Review

ShivaKumar

Rajamurugan

2022

Proceedings of the Institution of Mechanical Engineers, Part C:

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Friction stir welding (FSW) is one among solid-state welding processes that can be employed for producing joints between dissimilar combinations with more ease than that of fusion welding processes. Several high coupled physical phenomena have addressed FSW as an extremely complex process. It is around three decades of invention, optimization of the parameters have been carried out even today by many researchers all over the world to obtain sound joints. This article focuses mainly on the research developments in the dissimilar FSW (DFSW), with the factors that are involved in joint fabrication between dissimilar materials. From the literature, it is found that the most influential factors in deciding the quality of the joints are pin profile, shoulder shape, welding speed and tool rotational speed. In addition, all other parameters will provide incremental support to it. The study on microstructure in different zones and the mechanical properties of welded specimens are elaborated from the available literature. Special attention is given to the reinforcement of micro- and nano- sized solid particles in the DFSW process. Future studies of DFSW are discussed based on the untracked studies that are not available in the literature.

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“…It can be remarked from the hardness map that is described in blue color with a hardness value of about 29 HV (Figure 18a) at the 50 mm/min travel speed, and the color map changed to red color with hardness values around 36 HV (Figure 18d) using the Cy pin at the 300 mm/min travel speed. The correlations between microstructures and mechanical properties in terms of hardness and joint strength of the friction stir-welded aluminum alloys under different travel speeds have been studied in many works [39,40]. Increasing travel speeds can improve the mechanical properties of the friction stir welded joints through the enhancement of the material flow and plastic deformation [41,42], but extremely high travel speed can cause defects such as voids, tunnels, kissing bond, and lack of penetration due to the lack of heat input [43,44].…”

Section: Mechanical Propertiesmentioning

confidence: 99%

“…In contrast, extremely low travel speed promotes very high heat input, which can cause a serious softening manner in the weld zone. Lin et al [40] studied the effect of travel speed (50-200 mm/min) on the microstructure and mechanical properties of 12-mm thick Al-Zn-Mg alloy at a constant rotation speed of 450 rpm. They found that both the average grain sizes of the shoulder-affected zone, NZ, and the widths of TMAZ decreased with the increase of travel speed.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

The Influence of Tool Pin Geometry and Speed on the Mechanical Properties of the Bobbin Tool Friction Stir Processed AA1050

et al. 2022

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AA1050 plates of 8 mm thickness were processed via bobbin-tool friction stir processing technique at a constant rotation speed of 600 rpm and different travel speeds ranging from 50 to 300 mm/min using three-pin geometries of triangle, square, and cylindrical. The temperatures of the processed zone, the advancing side, and the retreating side were measured; the machine torque during processing was also recorded. The processed materials were evaluated in terms of surface roughness, macrostructure, tensile properties, and hardness measurements. The fracture surfaces of the tensile fractured specimens were investigated using SEM. The results indicated that the pin geometry and processing speed significantly affect the generated heat input and the morphology of the processed zone. The peak temperature in the center of the processed zone decreases with increasing the travel speed from 50 to 300 mm/min at all applied pin geometries. The maximum temperature of ~400 °C was reached using the cylindrical pin geometry. The machine torque increases with increasing the travel speed at all applied pin geometries, and the highest torque value of 73 N.m is recorded using the square pin geometry at 300 mm/min travel speed. The top surface roughness of the processed area using the cylindrical pin is lower than that given by the other pin geometries. Under all applied conditions, the hardness of the processed area increases with increasing travel speed, and the cylindrical pin shows a higher hardness than the other pin geometries with 19% enhancement over the BM. The AA1050 processed using a cylindrical pin at 200 mm/min travel speed and a rotation speed of 600 rpm produces a sound processing zone with the highest ultimate tensile strength of 79 MPa.

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Effect of Travel Speed on Microstructure and Mechanical Properties of FSW Joints for Al–Zn–Mg Alloy

Cited by 11 publications

References 51 publications

Research on the Properties and Low Cycle Fatigue of Sc-Modified AA2519-T62 FSW Joint

Research on the Properties and Low Cycle Fatigue of Sc-Modified AA2519-T62 FSW Joint

Friction stir welding of dissimilar alloy combinations—A Review

The Influence of Tool Pin Geometry and Speed on the Mechanical Properties of the Bobbin Tool Friction Stir Processed AA1050

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