Faculty Publications

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Author: search.filters.author.Banerjee, K.Subject: search.filters.subject.Mechanical properties

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    Structure-property correlation of weld metal zone and interface regions of cold metal transfer welded dissimilar Al-Mg-Mn alloys joint
    (Elsevier Ltd, 2021) Rajeshkumar, R.; Niranjani, V.L.; Devakumaran, K.; Banerjee, K.
    Cold Metal Transfer (CMT) welding of dissimilar Al-2.6 Mg-0.5Mn (A5754) and Al-4.5 Mg-1.0Mn (A5083) aluminium alloys has been performed with ER5356 filler wire. The microstructure and mechanical properties of the weld-metal zone (WMZ) and interface regions are correlated. The microstructure reveals epitaxial grains at the edge of the partially molten zone (PMZ) and equiaxed dendritic structure at the center of the WMZ. Energy dispersive spectroscopy (EDS) results show that the WMZ and PMZs are composed of α-Al, Al3Mg2and Al6Mn phases. The WMZ exhibits higher hardness and strength due to the existence of equiaxed dendrite structure, dilution effect and absence of defects. The interface region of A5083 side exhibits higher hardness and strength due to the presence of finer grains and higher volume fine secondary phases in the PMZ and HAZ of this side than at the other side. Fracture surface of all the samples exhibits dimples indicating a ductile fracture. © 2021 Elsevier Ltd. All rights reserved.
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    Role of interfacial microstructure on mechanical properties of cold metal transfer welded dissimilar A6061-T6 and A6082-T6 joints
    (Elsevier B.V., 2020) Rajeshkumar, R.; Devakumaran, K.; Banerjee, K.
    A6061-T6 and A6082-T6 dissimilar aluminium alloys are welded using CMT (Cold metal transfer) process and the interface microstructure of the individual alloys is correlated with mechanical properties. Microstructures indicate that dendrites next to the PMZ (Partially melted zone) of A6082-T6 side are finer than the dendrites next to the PMZ of A6061-T6 side. Liquation at grain boundaries and within the grains is clearly visible in the PMZ of A6061-T6 interface, whereas the PMZ of A6082-T6 interface does not reveal liquation phenomenon at grain boundaries and grain interiors. Among the interface regions, the A6082-T6 side shows superior mechanical properties as compared to the A6061-T6 side. © 2020 Elsevier B.V.
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    Fusion boundary microstructure evolution and mechanical properties of cold metal transfer welded dissimilar A5754 and A5083 joint
    (Elsevier B.V., 2021) Rajeshkumar, R.; Niranjani, V.L.; Devakumaran, K.; Banerjee, K.
    Fusion boundary microstructure evolution and its effect on tensile properties of cold metal transfer (CMT) welded joint of dissimilar A5754 and A5083 is studied. Non-dendritic equiaxed fine zone (EQZ) is newly evolved and located between PMZ and weld metal zone (WMZ). The Si films are distributed as continuous layers at grain boundaries (GBs) of EQZ, these films are comparatively less and are distributed in a non-continuous manner at GBs of partially melted zone (PMZ). EQZ of A5083 side exhibits finer grains than A5754 side. The narrower EQZ width, finer grains at EQZ, finer dendrites at WMZ interface and larger distribution of secondary phase particles at PMZ and heat affected zone (HAZ) increase strength of A5083 side. © 2020 Elsevier B.V.