Microstructure and mechanical behavior of similar and dissimilar AA2024 and AA7039 friction stir welds

Sharma, Chaitanya; Upadhyay, Vikas

doi:10.30765/er.1533

Cited by 7 publications

(6 citation statements)

References 4 publications

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“…The strength efficiency was 26-29% lower, whereas a 5-15% increase in elongation efficiency was recorded. Similar results were reported by Sharma et al 37 for dissimilar FSW welds of AA2024-AA7039, and Kumar et al 38,39 for AA2014 and AA7075 where weld tensile strength was lower than weak metal and attributed same to more contribution of low strength metal in weld region owing to complex material flow. 40,41 WFC welded joints display higher UTS than FAC and CAC welded joints.…”

Section: Tensile Analysissupporting

confidence: 86%

Effect of in-process cooling on microstructure and mechanical properties of dissimilar AA2014 and AA7075 friction stir welded joints

Kumar

Upadhyay

Misra

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part C:

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Heat-carrying capacity of a cooling medium is critical as it governs microstructure evolution and tensile properties during friction stir welding (FSW). In this research, three cooling techniques: conventional air-cooling (CAC), forced air-cooling (FAC), and water flow cooling (WFC), were employed to study the effect on microstructure and mechanical properties in dissimilar FSW of AA2014 and AA7075. In-process cooling significantly influenced weld microstructure, zone size, microhardness, and tensile properties, which varied with the cooling medium. Water flow cooling was the most effective cooling technique due to its higher heat carrying capacity than CAC and FAC. Water flow cooling resulted in a drastically refined grains structure of smaller size in all zones, had higher tensile strength, elongation, and heat-affected (HAZ) hardness than CAC and FAC. Greatly refined grain structure and less dissolution of precipitates in weld nugget zone (WNZ) along with smaller HAZ and thermo-mechanically affected zone (TMAZ) are responsible for improved weld properties of WFC than the FAC and CAC. Forced air-cooling resulted in a higher microhardness value at WNZ, followed by WFC and CAC. Fractured surfaces of the tensile specimen were scrutinized by scanning electron microscope. Cooling did not affect the fracture side and location; however, fracture mode changed with cooling medium viz. ductile for FAC and WFC and mixed-mode for CAC.

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Section: Tensile Analysissupporting

confidence: 86%

Effect of in-process cooling on microstructure and mechanical properties of dissimilar AA2014 and AA7075 friction stir welded joints

Kumar

Upadhyay

Misra

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…Continued loading propagates cracks, reducing the cross-section's area to critical values that could not support the applied tensile load; thus, failure results. 33 The growth and coalescence of voids govern the fracture behaviors as local plastic instability forms microscopic flaws upon the growth of voids to critical sizes. 31 Fragmented precipitate could be seen inside the dimples with well-defined tear ridges.…”

Section: Fractographymentioning

confidence: 99%

Microstructure and mechanical properties of dissimilar friction stir welds of AA2014 and AA7075

Kumar

Upadhyay

Sharma³

2021

Proceedings of the Institution of Mechanical Engineers, Part E:

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This work investigates the effect of process parameters on microstructure, mechanical properties, and fracture behavior of friction stir welded high-strength aluminum alloys AA2014-T6 and AA7075-T6. Optical micrograph, tensile property, and hardness profile of each weld were determined for analysis, and the tensile fracture surfaces were studied by scanning electron microscope. Welds microstructure were heterogeneous and displayed structures comprising of both base metals and the onion rings were seen in all welds except for the lowest heat input weld. Grains in the weld nugget zone were more refined on the retreating side than the other side. Asymmetric hardness profile had a distinct softened zone on each side whose location and softening extent varied with the processing parameters. Welding speed had a more significant effect on tensile strength than rotary speed and, drastically decreased the same. Faster welding speed formed microscopic defects and changed the appearance of fractured surfaces from flat to zigzag. The welds underwent ductile and mixed-mode tensile failure on the advancing side. Attainment of optimum combination of process parameters is imperative to yield defect-free stronger dissimilar welds

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“…Stir zone consists of advancing side material for AA2219/AA6061 welds [ Priya et al, 2009] and retreating side material for A356/AA6061 welds [13 Lee et al, 2003]. Mechanical mixing and insufficient diffusion produced heterogeneous stir zone comprising AA2024 and AA7039 base metals with Zn or Cu rich zones and lamellae flow patterns [Sharma et al, 2021& Ouyang et al, 2002. Stronger base material is placed on retreating side to achieve higher mechanical properties [Lee et al, 2003].…”

Section: Introductionmentioning

confidence: 99%

Material Flow Behavior in Dissimilar Friction Stir Welds of AA2024 and AA5086 Aluminum Alloys

Sharma¹,

Tripathi²,

Verma³

et al. 2022

JER is an international, peer-reviewed journal that publishes f

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This research aims to investigate the material flow behaviour and microstructure evolution in friction stir welded joints of dissimilar aluminium alloys AA2024/AA5086. AA2024 plate was placed on re- treating side; welded using threaded conical flat shoulder tool rotating at 635 rpm and moving along the joint line with a speed of 75mm/min. Mixing of both the material was clearly visible in stir zone and resulted in features typical to dissimilar friction stir welding and solid state flow patterns beside different zones. Onion rings, laminar flow, vertex flow was main flow features observed in the stir zone. Non- uniform mixing of different chemical composition base material is behind the formation of these flow features and inclusive chemical mixing may abolish solid state flow features.

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Microstructure and mechanical behavior of similar and dissimilar AA2024 and AA7039 friction stir welds

Cited by 7 publications

References 4 publications

Effect of in-process cooling on microstructure and mechanical properties of dissimilar AA2014 and AA7075 friction stir welded joints

Effect of in-process cooling on microstructure and mechanical properties of dissimilar AA2014 and AA7075 friction stir welded joints

Microstructure and mechanical properties of dissimilar friction stir welds of AA2014 and AA7075

Material Flow Behavior in Dissimilar Friction Stir Welds of AA2024 and AA5086 Aluminum Alloys

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