Finite element modeling of microstructural changes in dry and cryogenic machining of AZ31B magnesium alloy |
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| Institution: | 2. Department of Mechanical, Energy and Management Engineering, University of Calabria, Rende, CS 87036, Italy;3. Center for Biomedical Engineering, University of Kentucky, Lexington, KY 40506, USA;1. Department of Mechanical Engineering, University of Louisiana at Lafayette, Lafayette, LA 70504, USA;2. Department of Physics, University of North Texas, Denton, TX 76203, USA;3. Department of Mechanical Engineering Technology, Michigan Technological University, Houghton, MI 49913, USA;1. Department of Mechanical, Energy and Management Engineering, University of Calabria, Rende CS 87036, Italy;2. Department of Mechanical Engineering, University of Birjand, Birjand, Iran;3. Mondragon University, Mondragon 20500, Spain;1. Georgia W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA;2. Third Wave Systems, Minneapolis, MN 55344, USA;1. University of Kentucky, Institute for Sustainable Manufacturing (ISM), Lexington, KY 40506, USA;2. University of Calabria, Department of Mechanical, Energy and Management Engineering, 87036 Rende (CS), Italy;1. Department of Mechanical Engineering, American University of Beirut, PO Box 11-0236 Beirut, Lebanon;2. Institute for Sustainable Manufacturing, University of Kentucky 523 CRMS Building, Lexington, KY 40506-0108, USA |
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| Abstract: | Unsatisfactory corrosion resistance is one of the major disadvantages of magnesium alloys that impede their wide application. Microstructural changes, especially grain sizes, of Mg alloys have significant influence on their corrosion resistance. Cryogenic machining was reported to effectively induce grain refinement on Mg alloys and has a potential to improve their corrosion resistance. It is important to model these changes so that proper machining conditions can be found to enhance the corrosion rate of Mg alloys. In this paper, a preliminary study was conducted to model the microstructural changes of AZ31B Mg alloy during dry and cryogenic machining using the finite element (FE) method and a user subroutine based on the dynamic recrystallization (DRX) mechanism of Mg alloys. Good agreement in terms of grain size and affected layer thickness was found between experimental and predicted results. A numerical study was conducted using this model to investigate the influence of rake angle on microstructural changes after cryogenic machining. |
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| Keywords: | Cryogenic machining Finite element method (FEM) Dynamic recrystallization (DRX) Microstructrual changes Mg alloy |
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