Effect of Thermal Exposure Time on the Relaxation of Residual Stress in High Pressure Die Cast AM60 2016-01-0423
Magnesium alloys are becoming more commonly used for large castings with sections of varying thicknesses. During subsequent processing at elevated temperatures, residual stresses may relax and become a potential mechanism for part distortion. This study was conducted to quantify the effects of thermal exposure on residual stresses and relaxation in a high pressure die cast magnesium (AM60) alloy. The goal was to characterize relaxation of residual stresses at temperatures that are commonly experienced by body components during a typical paint bake cycle. A residual stress test sample design and quench technique developed for relaxation were used and a relaxation study was conducted at two exposure temperatures (140°C and 200°C) over a range of exposure times (0.25 to 24 hours). The results indicate that a significant amount of residual stress relaxation occurred very rapidly during exposure at both exposure temperatures.
Citation: Hill, H., Zindel, J., and Godlewski, L., "Effect of Thermal Exposure Time on the Relaxation of Residual Stress in High Pressure Die Cast AM60," SAE Int. J. Mater. Manf. 9(3):653-660, 2016, https://doi.org/10.4271/2016-01-0423. Download Citation
Author(s):
Haley Hill, Jacob Zindel, Larry Godlewski
Affiliated:
Ford Motor Company
Pages: 8
Event:
SAE 2016 World Congress and Exhibition
ISSN:
1946-3979
e-ISSN:
1946-3987
Also in:
SAE International Journal of Materials and Manufacturing-V125-5, SAE International Journal of Materials and Manufacturing-V125-5EJ
Related Topics:
Magnesium alloys
Casting
Magnesium
Coatings, colorants, and finishes
Alloys
Pressure
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