Journal article
Enhanced Surface Integrity From Cryogenic Machining of AZ31B Mg Alloy: A Physics-Based Analysis With Microstructure Prediction
Journal of manufacturing science and engineering, Vol.139(6), p.61012
06/01/2017
DOI: 10.1115/1.4034279
Abstract
The use of magnesium (Mg) alloy has been continuously on the rise with numerous expanded application in transportation/aerospace industries due to their lightweight and other areas, such as biodegradable medical implants. It was shown recently that machining can be used to improve the functional performance of Mg-based products/components, such as corrosion resistance, through engineered surface integrity. In this paper, the behavior of AZ31B Mg alloy in cryogenic machining was discussed firstly. The surface integrity can be significantly improved by introducing the ultrafine grained (UFG) layer due to the severe plastic deformation (SPD) effect during cryogenic machining. The mechanisms of microstructure evolution and plastic deformation were analyzed based on the experimental findings in literature. A physics-based constitutive model involving material plasticity and grain refinement is developed based on both slip and twinning mechanisms and successfully implemented in a finite-element (FE) analysis with multiple cutting passes to predict the microstructure evolution by nanocrystalline grain refinement and other improvement of the surface integrity in the cryogenic machining of AZ31B Mg alloy. With a more quantitative assessment, the FE model results are further discussed for grain refinement, changes in microhardness, residual stresses, and slip/twinning mechanism with the apparent SPD taking place due to rapid cryogenic cooling.
Details
- Title: Subtitle
- Enhanced Surface Integrity From Cryogenic Machining of AZ31B Mg Alloy: A Physics-Based Analysis With Microstructure Prediction
- Creators
- Ninggang Shen - University of IowaHongtao Ding - University of IowaZhengwen Pu - University of KentuckyI. S Jawahir - University of KentuckyTao Jia - GE Global ResearchNiskayuna, NY 12309
- Resource Type
- Journal article
- Publication Details
- Journal of manufacturing science and engineering, Vol.139(6), p.61012
- Publisher
- ASME
- DOI
- 10.1115/1.4034279
- ISSN
- 1087-1357
- eISSN
- 1528-8935
- Grant note
- DOI: 10.13039/100000001, name: National Science Foundation, award: 20150101023JC, 2015S013, 2015S015, 51405031, 51575057, EPS-1101284, MSV201514
- Language
- English
- Date published
- 06/01/2017
- Academic Unit
- Mechanical Engineering
- Record Identifier
- 9984196504802771
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