Post-Weld Heat Treatment Effects on Mechanical Properties and Microstructure of AA6061-T6 Butt Joints Made by Friction Stir Welding at Right Angle (RAFSW)

Momeni, Mahboubeh; Guillot, Michel

doi:10.3390/jmmp3020042

Cited by 5 publications

(5 citation statements)

References 27 publications

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“…e processed GTAWed joint exhibits similar behaviour to processed and unprocessed FSWed. is behaviour is a result of the coarsening of the precipitates on the welded region formed during FSW process, as well as the reheating and restirring during FSP [55,56]. e unprocessed GTAWed joint shows an approximately horizontal line to the retreating side with a microhardness value of about 87 HV.…”

Section: 2mentioning

confidence: 99%

Effect of Friction Stir Processing on Gas Tungsten Arc-Welded and Friction Stir-Welded 5083-H111 Aluminium Alloy Joints

Mabuwa

Msomi

2019

Advances in Materials Science and Engineering

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This paper presents the analysis of the friction stir-processed aluminium alloy 5083-H111 gas tungsten arc-welded and friction stir-welded joints. The comparative analysis was performed on the processed and unprocessed gas tungsten arc-welded and friction stir-welded joints of similar aluminium alloy 5083-H111. The results showed a clear distinction between the friction stir processed joints and unprocessed joints. There is a good correlation observed between the microstructural results and the tensile results. Ultrafine grain sizes of 4.62 μm and 7.177 μm were observed on the microstructure of the friction stir-processed friction stir-welded and gas tungsten arc-welded joints. The ultimate tensile strength for friction stir-welded and gas tungsten arc-welded before friction stir processing was 153.75 and 262.083 MPa, respectively. The ultimate tensile strength for friction stir processed friction stir-welded joint was 303.153 MPa and gas tungsten arc-welded joints one was 249.917 MPa. The microhardness values for the unprocessed friction stir-welded and gas tungsten arc-welded joints were both approximately 87 HV, while those of the friction stir-processed ones were 86.5 and 86 HV, respectively. The application of friction stir processing transformed the gas tungsten arc morphology from brittle to ductile dimples and reduced the ductile dimple size of the unprocessed friction stir-welded joints from the range of 4.90–38.33 μm to 3.35–15.59 μm.

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Section: 2mentioning

confidence: 99%

Effect of Friction Stir Processing on Gas Tungsten Arc-Welded and Friction Stir-Welded 5083-H111 Aluminium Alloy Joints

Mabuwa

Msomi

2019

Advances in Materials Science and Engineering

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“…Some of articles focused post weld heat treatment, but on FSWed joints only. For example, Momeni M. and Guillot M. [11] studied the PWHT of Friction Stir Welding at Right Angle (RAFSW) of aluminium alloys. They used butt joints of an AA6061-T6.…”

Section: Introductionmentioning

confidence: 99%

An investigation of post-weld heat treatment of friction stir welded aluminium blanks AA2024 embedded with AA7075

Saad

Ibrahem

Abu–Okail

et al. 2022

J. Phys.: Conf. Ser.

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This article is focused main problem during and after FSW especially when joining blanks AA2024 embedded with interlayer strip widths AA7075, in microstructure of the welded zone, that will in turn affect its mechanical properties of the welded joints. So, a number of interlock strip widths of AA7075 as 1, 1.5, 2, 2.5 and 3 mm were added between two substrates of base metal AA2024 during FSW technique then followed heating and cooling procedures to incorporate into the heat treatment process, which is conducted to create changes in a material’s microstructure that will in turn affect its mechanical properties. The analyses by optical microscope and scanning electron microscope were used to clarify microstructural characterization of FSWed with interlock strip widths after PWHTed. On the other hand, the microhardness and tensile tests were performed to determine mechanical properties of FSWed with interlock strip widths after PWHTed. The observations of microstructural elucidated that the good bonding connection between interlayer strip widths AA7075 and base metal AA2024 was due to use the procedures of PWHT. The mechanical properties such as microhardness and tensile of produced joints with PWHTed were showed higher than without PWHTed. Specifically, the ultimate tensile strength, and hardness values of the post-heat joint when using 3mm interlayer strip were obtained the highest values 299MPa, 186 HV respectively. This presents improvement by 11.2% in tensile strength, and 84% in hardness, compared to as weld joint.

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“…However, studies addressing the effect of heat treatments on properties of a friction stir welded or processed A6061 alloy are few. Momeni revealed in their study on post-weld heat treatment effects on the mechanical properties of AA6061-T6 butt FSW that a single fast artificial aging process is more beneficial than solubilizing followed by an artificial aging process in terms of tensile properties, consumed time, and cost [27]. Ahmed compared mechanical properties of friction stir welded A6061 under three different heat treatment conditions i.e., annealed, artificially aged (T6), and post weld heat treated.…”

Section: Introductionmentioning

confidence: 99%

Effect of Friction Stir Forming Parameters and Heat Treatment on Mechanical Properties of Fibre-Reinforced Aluminium Alloy

Tabatabaei

Ohashi

Nishihara

2022

KEM

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Fibre-reinforced materials have garnered attention due to their significant properties such as abrasion and heat resistance, as well as specific strength, which can result in environmental conservation and improved mechanical properties that can solve the limitation of developing light-weight constructions. A new method of joining stainless steel strands with an aluminium alloy using friction stir forming has recently been developed in our laboratory. In present study, the influence of the process parameters on the mechanical properties of a fibre-reinforced aluminium alloy using friction stir forming was investigated. In particular, the effect of process parameters on microstructure, hardness, and tensile properties of A5083 and A6061 alloys was evaluated. The highest tensile strength was observed at 880 and 1,240 rpm, whereas for lower rotation speeds (440 and 620 rpm), the strength decreased due to low temperatures and lower heat input. Heat treatments were applied to improve the mechanical properties of the developed A6061 fibre-reinforced composite. The effects of process parameters and heat treatment conditions on mechanical properties were experimentally investigated, and it revealed improved mechanical properties after applying T6 and age hardening treatments. It was confirmed that the strength after the heat treatment of A6061 was higher than that of the base material (310 MPa), and a high strength of 345 MPa was obtained at a rotation speed of 1240 rpm. It was concluded that rotational speed and heat treatment conditions significantly affect the metal microstructure and mechanical properties of the joint.

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Post-Weld Heat Treatment Effects on Mechanical Properties and Microstructure of AA6061-T6 Butt Joints Made by Friction Stir Welding at Right Angle (RAFSW)

Cited by 5 publications

References 27 publications

Effect of Friction Stir Processing on Gas Tungsten Arc-Welded and Friction Stir-Welded 5083-H111 Aluminium Alloy Joints

Effect of Friction Stir Processing on Gas Tungsten Arc-Welded and Friction Stir-Welded 5083-H111 Aluminium Alloy Joints

An investigation of post-weld heat treatment of friction stir welded aluminium blanks AA2024 embedded with AA7075

Effect of Friction Stir Forming Parameters and Heat Treatment on Mechanical Properties of Fibre-Reinforced Aluminium Alloy

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