Abstract
The effects of in-process cryogenic LN cooling on the resulting grain size of the friction stir processing (FSP) of twin roll cast (TRC) magnesium alloy AZ31B. Sheets (3 mm-thick) of TRC AZ31B were friction stir processed using a wide range of processing parameters (mostly tool feed and spindle speed). The tool rotational speed was varied between 600 RPM and 2,000 RPM while the tool feed rate varied between 75 mm/min and 900 mm/min. Thrust force and torque values were experimentally measured using a 4-component dynamometer. Temperature measurements were monitored during the different tests using Infrared sensors and thermocouples. The microstructure of processed samples was observed using optical microscopy. It was found that thrust force and torque values of the pre-cooled samples were 5% higher than those of the room temperature samples due to the material hardening induced by the cooling effect. Finer and more homogenous microstructure was observed for the pre-cooled samples when compared with samples processed at room temperature. The average grain size of pre-cooled samples was predicted using a relation -previously introduced by the authors- that relate grain size and the Zener-Hollomon parameter for TRC AZ31B. This equation was found to correctly predict grain diameter for in-line cooled FSP AZ31B samples at temperatures lower than room temperature.
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Acknowledgments
This publication was made possible by the National Priorities Research Program (NPRP) Grant # 09-611-2-236 from the Qatar National Research Fund (a member of The Qatar Foundation). The authors like to acknowledge the financial support of the university research board (URB) of the American University of Beirut (AUB). The statements made herein are solely the responsibility of the authors. Also, special thanks to Chehab Medical Gases (Beirut, Lebanon) for their help in providing components that are compatible with Liquid Nitrogen and for sharing their knowledge and expertise.
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Ammouri, A.H., Kridli, G.T., Ayoub, G.Y., Hamade, R.F. (2015). Pre-cooling Effects on the Resulting Grain Size in Friction Stir Processing of AZ31B. In: Yang, GC., Ao, SI., Gelman, L. (eds) Transactions on Engineering Technologies. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-9804-4_24
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DOI: https://doi.org/10.1007/978-94-017-9804-4_24
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