Influence of rotational speed on mechanical and microstructural characteristics on the rotary friction welded as-cast LM25 aluminium alloy

Khan, M. A.; Rajakumar, S.; Pragatheswaran, T.

doi:10.1016/j.matpr.2020.02.721

Cited by 2 publications

(1 citation statement)

References 8 publications

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“…The IFW process parameters matrix were restricted to three key parameters that have the most significant influence on weld microstructure, i.e. welding speed, friction and forge forces [14]. The Design of Experiments (DoE) was based on the Taguchi Orthogonal Array (ORA), specifically the L9 method [15], from which three parameters and three levels were selected.…”

Section: Ifw Processmentioning

confidence: 99%

Inter-relationship between microstructure evolution and mechanical properties in inertia friction welded 8630 low-alloy steel

Banerjee

Ntovas

Silva

et al. 2021

Archiv.Civ.Mech.Eng

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The evolution of microstructure and mechanical properties in AISI 8630 low-alloy steel subjected to inertia friction welding (IFW) have been investigated. The effects of three critical process parameters, viz. rotational speed, friction and forge forces, during welding of tubular specimens were explored. The mechanical properties of these weld joints, including tensile and Charpy V-notch impact were studied for determining the optimum welding parameters. The weld joints exhibited higher yield strength, lower hardening capacity and ultimate tensile strength compared to base metal (BM). The maximum strength and ductility combination was achieved for the welds produced under a nominal weld speed of ~ 2900–3100 rpm, the highest friction force of ~ 680–720 kN, and the lowest axial forging load of ~ 560–600 kN. The measured hardness distribution depicted higher values for the weld zone (WZ) compared to the thermo-mechanically affected zone (TMAZ), heat-affected zone (HAZ) and BM, irrespective of the applied welding parameters. The substantial increase in the hardness of the WZ is due to the formation of microstructures that were dominated by martensite. The observed microstructural features, i.e. the fractions of martensite, bainite and ferrite, show that the temperature in the WZ and TMAZ was above Ac3, whereas that of the HAZ was below Ac1 during the IFW. The fracture surface of the tensile and impact-tested specimens exhibited the presence of dimples nucleating from the voids, thus indicating a ductile failure. EBSD maps of the WZ revealed the formation of subgrains inside the prior austenite grains, indicating the occurrence of continuous dynamic recrystallisation during the weld. Analysis of crystallographic texture indicated that the austenite microstructure (i.e. FCC) in both the WZ and TMAZ undergoes simple shear deformation during IFW.

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Section: Ifw Processmentioning

confidence: 99%

Inter-relationship between microstructure evolution and mechanical properties in inertia friction welded 8630 low-alloy steel

Banerjee

Ntovas

Silva

et al. 2021

Archiv.Civ.Mech.Eng

View full text Add to dashboard Cite

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Heterogeneous Deformation Behaviors of an Inertia Friction Welded Ti2AlNb Joint: an In-situ Study

Jin

Cai

et al. 2022

Acta Metall. Sin. (Engl. Lett.)

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A defect-free Ti 2 AlNb joint has been obtained by the inertia friction welding (IFW) technology. The weld zone (WZ) is composed of B2 grains refined by discontinuous dynamic recrystallization and enhanced by grain refinement strengthening. And the average microhardness decreases by about 30 HV from the WZ to the base metal. In-situ SEM analysis reveals that the heterogeneous structure of the joint causes strong strain partitioning during tensile deformation. The microcrack initiation occurs at the interface of the initial B2 phases and B2/O boundaries. Owing to stress concentration, the multi-slip bands and cracks tend to generate in the heat-affected zone (HAZ), causing a premature fracture.

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Influence of rotational speed on mechanical and microstructural characteristics on the rotary friction welded as-cast LM25 aluminium alloy

Cited by 2 publications

References 8 publications

Inter-relationship between microstructure evolution and mechanical properties in inertia friction welded 8630 low-alloy steel

Inter-relationship between microstructure evolution and mechanical properties in inertia friction welded 8630 low-alloy steel

Heterogeneous Deformation Behaviors of an Inertia Friction Welded Ti2AlNb Joint: an In-situ Study

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