Comparative study of incoloy 825 mechanical properties and microstructure via FSW with and without carbon nanotubes
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This study investigates the mechanical properties and microstructure of Incoloy 825 alloy joints made using friction stirwelding (FSW), with and without carbon nanotube (CNT) reinforcement. FSW was performed at different tool rotationspeeds (300-500 rpm) and welding speeds (20-100 mm/min). The best results were achieved at 400 rpm and 30 mm/min. Microstructural analysis using scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDX) showedthat CNTs were evenly spread in the stir zone without forming clusters. X-ray diffraction (XRD) and Raman spectroscopyconfirmed that there were no major changes in the alloy's phases, keeping its original structure intact. Adding CNTs improvedthe tensile strength and hardness of the joints by creating finer grains through dynamic recrystallization. The CNT-reinforcedjoints showed better mechanical properties due to effective load transfer and grain refinement. This study shows that addingCNTs during FSW is a useful way to improve the mechanical properties of Incoloy 825 joints, making them suitable foradvanced engineering applications.
Abstract
This study investigates the mechanical properties and microstructure of Incoloy 825 alloy joints made using friction stirwelding (FSW), with and without carbon nanotube (CNT) reinforcement. FSW was performed at different tool rotationspeeds (300-500 rpm) and welding speeds (20-100 mm/min). The best results were achieved at 400 rpm and 30 mm/min. Microstructural analysis using scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDX) showedthat CNTs were evenly spread in the stir zone without forming clusters. X-ray diffraction (XRD) and Raman spectroscopyconfirmed that there were no major changes in the alloy's phases, keeping its original structure intact. Adding CNTs improvedthe tensile strength and hardness of the joints by creating finer grains through dynamic recrystallization. The CNT-reinforcedjoints showed better mechanical properties due to effective load transfer and grain refinement. This study shows that addingCNTs during FSW is a useful way to improve the mechanical properties of Incoloy 825 joints, making them suitable foradvanced engineering applications.