Influence of tool rotational speed on the microstructural characterization and mechanical properties of friction stir welded Al-Si10Mg parts produced by DMLS additive manufacturing process

Thakur, Ankit; Mehlwal, Sumit; Minhas, Navdeep; Sharma, Varun

doi:10.1016/j.mseb.2022.115612

Cited by 23 publications

(6 citation statements)

References 32 publications

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Section: Resultsmentioning

confidence: 99%

“…Such refinement in the grain structure of the SZ and increase in the fraction of HAGBs is associated with the significant amount of dynamic recrystallization of the plastically deformed grain structure, which results due to the strong stirring action of the threaded tool pin. 34,35 It is further observed from the micrographs that, although, both the first and second passes were laid using the same parameters, however, the grain refinement was more pronounced for the second pass as compared to the first pass. This variation could be attributed to the fact that the laying of the second pass led to the reheating of the first pass, which resulted in the coarsening of grains and a reduction in the percentage of HAGBs of the first pass.…”

Section: Metallurgical Observationmentioning

confidence: 96%

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Investigation of metallurgical characterization and mechanical properties of double-sided friction stir welding of aluminum 6061 T6 alloy

Thakur

Sharma

Bhadauria

2022

Proceedings of the Institution of Mechanical Engineers, Part B:

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In the present study, the effect of tool tilt angle was investigated to appraise the metallurgical and mechanical behavior of double-sided friction stir welded joints of AA-6061 T6 alloy of 6 mm thick plates, using scrolled shoulder and frustum tool pin geometry. Two friction stir welded joints, with 0° (Joint J1) and 2° (Joint J2) tool tilt angles were fabricated using a fixed travel speed of 50 mm/min and tool rotational speed of 800 rpm. The metallurgical studies carried out by the electron backscattered diffraction showed that the incorporation of tool tilt angle resulted in the refinement of grains within the stir zone to a larger extent. The transverse tensile test results revealed that the joint efficiency of the J2 welded joint improved by 12% as compared to the J1 joint. The layered tensile specimens extracted from the different regions (first pass, second pass, and overlap region) of the stir zone of both the welded joints showed an appreciable variation in mechanical and metallurgical properties. The V-notch Charpy impact toughness test for J2 joint showed 16% higher toughness, with the presence of a 55% shear area fraction in the fractured impact specimens, as compared to the 30% for the J1 joint.

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Section: Resultsmentioning

confidence: 99%

Section: Metallurgical Observationmentioning

confidence: 96%

Investigation of metallurgical characterization and mechanical properties of double-sided friction stir welding of aluminum 6061 T6 alloy

Thakur

Sharma

Bhadauria

2022

Proceedings of the Institution of Mechanical Engineers, Part B:

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“…Of all the solid-state welding processes evaluated, FSW is by far the most widely used process for joining AM-manufactured Al alloys [37,[55][56][57][58][59][60][61][62][63][64][65][66][67][68][69][70]. For this process, only studies were found evaluating the weldability of parts produced by the PBF-LB process.…”

Section: Solid State Welding Processesmentioning

confidence: 99%

“…This behaviour can be explained by the increased heat input associated with the higher rotational speed. From a surface quality point of view, Thakur et al [62] pointed out another consequence of using high heat input in the FSW process. By increasing the rotational speed, the surface texture of the weld bead is significantly changed, from a highly rough surface with tool marks and embedded plastically deformed chips, to a nearly smooth surface.…”

Section: Solid State Welding Processesmentioning

confidence: 99%

A Review on the Weldability of Additively Manufactured Aluminium Parts by Fusion and Solid-State Welding Processes

Nunes,

Faes,

De Waele

et al. 2023

Metals

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Additive manufacturing (AM) processes are playing a significant role in several industrial sectors such as construction and machine building industries, involving a wide variety of metallic materials. Among these, the AM of aluminium alloys has developed significantly over the last decade, mainly through Powder Bed Fusion (PBF) and Directed Energy Deposition (DED) processes. Despite the many advantages of AM technology, some large or complex products cannot be produced entirely without the use of conventional manufacturing and joining processes, generally for financial or operational reasons. In this way, the ability to join conventionally and additively manufactured components or parts represents a crucial step towards their future use and the consolidation of conventional and additive manufacturing technologies. Despite the growing interest in AM technologies, there is still a significant lack of information on the joining of conventionally and additively manufactured components. The present work proposes a first review of the literature evaluating the weldability of AM aluminium alloys. The focus is on the use of fusion and solid-state welding processes and analysing the achieved microstructural evolution and mechanical properties. A clear relationship is observed between the AM technology used to produce the part, and the physical principles of the joining process. In addition, the gaps in the literature are highlighted to enable focused future work.

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“…31 Figure 9(a) shows the texture components of the acquired PFs, which are derived using specific features according to the ideal simple shear texture of the face-centered cubic (FCC) materials. [32][33] It can be seen from the PFs that the different SZs were resolved into a mixture of texture components. Similarly, the dominance of the best possible resolved simple shear texture component of the respective SZ regions were assigned based on the fraction of the contour intensity, and are presented in Table 4.…”

Section: Base Materialsmentioning

confidence: 99%

Influence of forging action on the microstructural and mechanical characteristics of the friction stir welded joints of aluminum alloy with varied joint configurations

Thakur

Ojha

Bhadauria

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part C:

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The variation in the forging action during single-side friction stir welding (SS-FSW) and double side friction stir welding (DS-FSW) joining of AA-6061 T6 alloy by friction stir welding (FSW) process was conducted. The microscopic study of the stir zone (SZ) of SS-FSW joint configurations showed that the forging action obtained with a 3° tool tilt angle (TTA) provided better intermixing of material, with significant downward and inclined flow of plasticized material under the shoulder interaction zones. This led to the maximum grain refinement as compared to the forging action obtained with 0° and 2° TTA. For DS-FSW joint, a good interlocking between the material stirred during the first and second pass was observed, which led to maximum joint efficiency, and the elimination of the problem of insufficient root penetration observed during the SS-FSW. The misorientation analysis revealed that the percentage of high angle grain boundaries (HAGBs) significantly increased for DS-FSW joint due to the small thermal gradient along the plate thickness. Moreover, the dominance of B/[Formula: see text] shear texture with sufficient dissimilarity in the crystallographic orientation to the random texture was observed within the SZ of DS-FSW joint.

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Influence of tool rotational speed on the microstructural characterization and mechanical properties of friction stir welded Al-Si10Mg parts produced by DMLS additive manufacturing process

Cited by 23 publications

References 32 publications

Investigation of metallurgical characterization and mechanical properties of double-sided friction stir welding of aluminum 6061 T6 alloy

Investigation of metallurgical characterization and mechanical properties of double-sided friction stir welding of aluminum 6061 T6 alloy

A Review on the Weldability of Additively Manufactured Aluminium Parts by Fusion and Solid-State Welding Processes

Influence of forging action on the microstructural and mechanical characteristics of the friction stir welded joints of aluminum alloy with varied joint configurations

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