Fatigue crack growth in friction stir welds of 6082-T6 and 6061-T6 aluminium alloys: A comparison

Moreira, P.M.G.P.; Jesus, Abílio M.P. De; Ribeiro, Alfredo S.; Castro, P.M.S.T. de

doi:10.1016/j.tafmec.2008.07.007

Cited by 88 publications

(64 citation statements)

References 6 publications

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“…This is a useful marine grade aluminium alloy with excellent mechanical properties, good thermal weldability, good machinability, and excellent corrosion resistance [6]. It is suitable for structural applications including bridges, shipbuilding, and marine superstructures [7][8][9]. However, the material suffers from poor weldability using FSW [10].…”

Section: Contextmentioning

confidence: 99%

Development of Metallographic Etchants for the Microstructure Evolution of A6082-T6 BFSW Welds

Tamadon

Pons

Sued

et al. 2017

Metals

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BACKGROUND-The solid-phase joining of A6082-T6 plates by bobbin friction stir welding (BFSW) is problematic. Better methods are needed to evaluate the microstructural evolution of the weld. However, conventional Al reagents (e.g., Keller's and Kroll's) do not elucidate the microstructure satisfactorily, specifically regarding grain size and morphology within the weld region. APPROACH-We developed innovative etchants for metallographic observations for optical microscopy. RESULTS-The macrostructure and microstructure of A6082-T6 BFSW welds were clearly demonstrated by optical microscopy analysis. The microetching results demonstrated different microstructures of the Stir Zone (S.Z) distinct from the Base Metal (B.M) and Heat Affected Zone (HAZ) & Thermo-mechanical Affected Zone (TMAZ). The micrographs showed a significant decrease in grain size from 100 µm in B.M to ultrafine 4-10 µm grains for the S.Z. Also, the grain morphology changed from directional columnar in the B.M to equiaxed in the S.Z. Furthermore, thermomechanical recrystallization was observed by the morphological flow of the grain distortion in HAZ and TMAZ. The etchants also clearly show the polycrystalline structure, microflow patterns, and the incoherent interface around inclusion defects. ORIGINALITY-Chemical compositions are identified for a suite of etchant reagents for metallographic examination of the friction-stir welded A6082-T6 alloy. The reagents have made it possible to reveal microstructures not previously evident with optical microscopy.

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Section: Contextmentioning

confidence: 99%

Development of Metallographic Etchants for the Microstructure Evolution of A6082-T6 BFSW Welds

Tamadon

Pons

Sued

et al. 2017

Metals

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“…The aluminium alloy AW6082 T651 was selected for the adherends, characterised by a high tensile strength (340 MPa as specified by the manufacturer) obtained through artificial ageing at a temperature of approximately 180 1C [36]. This specific alloy was chosen due to its wide use in Europe for several structural applications under different extruded and laminated shapes.…”

Section: Characterisation Of the Materialsmentioning

confidence: 99%

Strength prediction of single- and double-lap joints by standard and extended finite element modelling

Campilho

Banea

Pinto³

et al. 2011

International Journal of Adhesion and Adhesives

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309

121

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The structural integrity of multi-component structures is usually determined by the strength and durability of their unions. Adhesive bonding is often chosen over welding, riveting and bolting, due to the reduction of stress concentrations, reduced weight penalty and easy manufacturing, amongst other issues. In the past decades, the Finite Element Method (FEM) has been used for the simulation and strength prediction of bonded structures, by strength of materials or fracture mechanics-based criteria. Cohesive-zone models (CZMs) have already proved to be an effective tool in modelling damage growth, surpassing a few limitations of the aforementioned techniques. Despite this fact, they still suffer from the restriction of damage growth only at predefined growth paths. The eXtended Finite Element Method (XFEM) is a recent improvement of the FEM, developed to allow the growth of discontinuities within bulk solids along an arbitrary path, by enriching degrees of freedom with special displacement functions, thus overcoming the main restriction of CZMs. These two techniques were tested to simulate adhesively bonded single-and double-lap joints. The comparative evaluation of the two methods showed their capabilities and/or limitations for this specific purpose.

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“…Fig. 16b-d, presents the FCG data obtained for the base metal, weld metal and HAZ in MIEA, as well as the comparison with Friction Stir Welding (FSW) data found in the literature (Moreira et al, 2008). Fig.…”

Section: Fatigue Crack Growth (Fcg)mentioning

confidence: 97%

Fusion Welding with Indirect Electric Arc

Garcı́a¹,

Lopez²,

Natividad³

et al. 2011

Arc Welding

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Fatigue crack growth in friction stir welds of 6082-T6 and 6061-T6 aluminium alloys: A comparison

Cited by 88 publications

References 6 publications

Development of Metallographic Etchants for the Microstructure Evolution of A6082-T6 BFSW Welds

Development of Metallographic Etchants for the Microstructure Evolution of A6082-T6 BFSW Welds

Strength prediction of single- and double-lap joints by standard and extended finite element modelling

Fusion Welding with Indirect Electric Arc

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