Improved properties of friction stir-welded AZ31 magnesium alloy by post-weld heat treatment

Wang, G.; Yan, Zhifeng; Zhang, H.; Zhang, X.; Liu, F.; Wang, Xinxin; Su, Yuebin

doi:10.1080/02670836.2016.1243356

Cited by 29 publications

(17 citation statements)

References 29 publications

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“…This zone was the tensile fracture location of the joint. During the PWHT process, static recrystallisation has been accomplished, and the grain size became more homogeneous after PWHT, as reported by Wang et al [51]. But it has been observed that after post-weld heat treatment, the grain structure in HAZ changed and new grains developed, see Figure 7(b).…”

Section: Microstructuresupporting

confidence: 59%

“…The dimple containing surfaces confirms that the failure mode was ductile. As journal.ump.edu.my/ijame ◄ reported by Wang et al [51] that the interface HAZ has a lower strength, so, the joint was failed at this HAZ interface of advancing side during tensile testing. The failure of PWHT tensile specimen in HAZ zone confirmed that PWHT had not any influence related to the location of the joint fracture.…”

Section: Tensile Propertiesmentioning

confidence: 91%

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Microstructural and Mechanical Behaviour Evaluation of Mg-Al-Zn Alloy Friction Stir Welded Joint

Singh¹,

Singh²,

Singh³

2020

IJAME

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The weight reduction concept is most effective to reduce the emissions of greenhouse gases from vehicles, which also improves fuel efficiency. Amongst lightweight materials, magnesium alloys are attractive to the automotive sector as a structural material. Welding feasibility of magnesium alloys acts as an influential role in its usage for lightweight prospects. Friction stir welding (FSW) is an appropriate technique as compared to other welding techniques to join magnesium alloys. Field of friction stir welding is emerging in the current scenario. The friction stir welding technique has been selected to weld AZ91 magnesium alloys in the current research work. The microstructure and mechanical characteristics of the produced FSW butt joints have been investigated. Further, the influence of post welding heat treatment (at 260 °C for 1 h) on these properties has also been examined. Post welding heat treatment (PWHT) resulted in the improvement of the grain structure of weld zones which affected the mechanical performance of the joints. After heat treatment, the tensile strength and elongation of the joint increased by 12.6 % and 31.9 % respectively. It is proven that after PWHT, the microhardness of the stir zone reduced and a comparatively smoothened microhardness profile of the FSW joint obtained. No considerable variation in the location of the tensile fracture was witnessed after PWHT. The results show that the impact toughness of the weld joints further decreases after post welding heat treatment.

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Section: Microstructuresupporting

confidence: 59%

Section: Tensile Propertiesmentioning

confidence: 91%

Microstructural and Mechanical Behaviour Evaluation of Mg-Al-Zn Alloy Friction Stir Welded Joint

Singh¹,

Singh²,

Singh³

2020

IJAME

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“…FSW is defined as a solid state joining process in which the workpieces being welded are not melted [6][7][8]. Continuous improvements to the performance of FSW joints during the process, has been achieved by variations of the process, as for instance, double-sided FSW that offers advantages over conventional FSW methods such as higher transverse speed and even distribution of heat input into the workpieces to be joined [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

A Microstructural Evaluation of Friction Stir Welded 7075 Aluminum Rolled Plate Heat Treated to the Semi-Solid State

Chegeni

Kapranos

2018

Metals

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Two rolled plates of 7075 aluminum alloy were used as starting material. The plates were welded using a simultaneous double-sided friction stir welding (FSW) process. One way of obtaining feedstock materials for Semi-solid processing or thixoforming is via deformation routes followed by partial melting in the semi-solid state. As both the base plate materials and the friction weld area have undergone extensive deformation specimens were subjected to a post welding heat-treatment in the semi-solid range at a temperature of 628 • C, for 3 min in order to observe the induced microstructural changes. A comparison between the microstructural evolution and mechanical properties of friction stir welded plates was performed before and after the heat-treatment in the Base Metal (BM), the Heat Affected Zone (HAZ), the Thermomechanically Affected Zone (TMAZ) and the Nugget Zone (NZ) using optical microscopy, Scanning Electron microscopy (SEM) and Vickers hardness tests. The results revealed that an extremely fine-grained structure, obtained in the NZ after FSW, resulted in a rise of hardness from the BM to the NZ. Furthermore, post welding heat-treatment in the semi-solid state gave rise to a consistent morphology throughout the material which was similar to microstructures obtained by the thixoforming process. Moreover, a drop of hardness was observed after heat treatment in all regions as compared to that in the welded microstructure.

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“…Further, during fabrication of weld joint, microstructure variation and a loss of strength of joint has been reported by earlier researchers. [30][31][32] Post welding heat treatment is an appropriate process to improve weld joint properties or performance. 33 Wang et al 31 and Guo et al 34 have reported the influence of post welding heat treatment on the microstructure and mechanical properties of FSW AZ31 Mg alloy, but the information is still limited.…”

Section: Introductionmentioning

confidence: 99%

“…[30][31][32] Post welding heat treatment is an appropriate process to improve weld joint properties or performance. 33 Wang et al 31 and Guo et al 34 have reported the influence of post welding heat treatment on the microstructure and mechanical properties of FSW AZ31 Mg alloy, but the information is still limited. In present work, microstructure and mechanical properties such as tensile properties, microhardness and impact toughness of FSW joint of AZ31Mg alloy for as-welded and post weld heat treated condition has been examined.…”

Section: Introductionmentioning

confidence: 99%

Influence of post welding heat treatment on the microstructure and mechanical properties of friction stir welding joint of AZ31 Mg alloy

Singh

Singh²,

Singh

2021

Proceedings of the Institution of Mechanical Engineers, Part E:

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At present, magnesium alloys are extensively used in numerous applications due to their light weight and better characteristics. Welding of magnesium alloys is regarded as one of the most complex phenomena in various industries. The friction stir welding of magnesium alloys has encouraged abundant scientific and industrial interest as it has the potency to form a good quality joint. Post welding heat treatment is an appropriate process to further improve the properties or performance of FSW joints. Therefore, the present work aims to join AZ31 Mg alloy plates by friction stir welding, and microstructural and mechanical properties of the joint have been examined. Furthermore, the consequence of post welding heat treatment on the microstructure and mechanical properties of FSW joint has been evaluated. Tensile strength and elongation of FSW joint were about 145.4 ± 4.9 MPa and 9.5 ± 0.9%, respectively. It was found that post welding heat treatment was beneficial in homogenizing grains and to enhance mechanical properties. Tensile strength and elongation of the joint were improved by 4.74% and 15.78% respectively after PWHT. The highest microhardness of stir zone decreased about 6.84% (73 Hv to 68 Hv) after heat treatment and hardness pattern of weld became relatively smooth. Toughness of PWHT joint was 4.5 ± 0.17 Joules. The mode of tensile failure of as-welded and PWHT joint was ductile.

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Improved properties of friction stir-welded AZ31 magnesium alloy by post-weld heat treatment

Cited by 29 publications

References 29 publications

Microstructural and Mechanical Behaviour Evaluation of Mg-Al-Zn Alloy Friction Stir Welded Joint

Microstructural and Mechanical Behaviour Evaluation of Mg-Al-Zn Alloy Friction Stir Welded Joint

A Microstructural Evaluation of Friction Stir Welded 7075 Aluminum Rolled Plate Heat Treated to the Semi-Solid State

Influence of post welding heat treatment on the microstructure and mechanical properties of friction stir welding joint of AZ31 Mg alloy

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