Abstract
In this work, the effect of variation in heat input on friction stir welding of 6 mm thick AA6092/ 17.5 SiCp-T6 aluminum matrix composite joints is analyzed. The effect of heat input on torque and force, time-temperature profile, microstructure and mechanical properties is studied. Heat input to the weld was controlled by varying traverse speed while keeping other process variables constant. The investigation shows that the cooling rate gradually increases from 3.32 to 5.72°C/s when the heat input decreases from 1915.4 to 1004.8 J/mm. Thereafter it increases rapidly to 14.1°C/s when the heat input further decreases to 730.76 J/mm. The particle size in the weld area decreases due to fragmentation as the heat input decreases from high to moderate and then again increases. The overall microhardness of the weld area increases with a decrease in heat input. The joint efficiency of 72, 88 and 84% is found as heat input decrease from high to low heat. The fractography shows a ductile mode of failure at moderate heat input, whereas at higher and lower heat input a mixed-mode of failure is observed.
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Acknowledgments
The authors are thankful to MHRD, GOI for providing the funds in terms of Ph.D. scholarship for carry out the study. The author gratefully acknowledges the help of DWA ALUMINUM COMPOSITES USA for providing the required material. The author also acknowledges ACMS and MSE department IIT Kanpur for their support for conducting the testing.
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Acharya, U., Yadava, M.K., Banik, A. et al. Effect of Heat Input on Microstructure and Mechanical Properties of Friction Stir Welded AA6092/17.5 SiCp-T6. J. of Materi Eng and Perform 30, 8936–8946 (2021). https://doi.org/10.1007/s11665-021-06122-3
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DOI: https://doi.org/10.1007/s11665-021-06122-3