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Machinability of 380 Alloy - Minor Impurity Constituent Effects
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English
Abstract
A small addition of magnesium (0.3%) to prime 380 die casting alloy (SAE 308) was found to improve the alloy's machinability. Magnesium hardens the matrix and by doing so
- reduces the tendency to build up on a tool edge,
- results in shorter and tighter chips,
- provides a better workpiece surface finish,
giving prime 380 desirable machining characteristics similar to those of secondary alloy. However, tool wear rates for the magnesium-modified prime alloy were significantly lower than those for secondary alloy.
Other minor/impurity element alloy variations also affected machining characteristics but less dramatically than the magnesium. Some elements traditionally credited with improving machinability were found in this study to be of little benefit.
Authors
Citation
Jorstad, J., "Machinability of 380 Alloy - Minor Impurity Constituent Effects," SAE Technical Paper 780250, 1978, https://doi.org/10.4271/780250.Also In
References
- Bonsack Walter “Iron - The Problematic Factor in Quality of Aluminum Alloy Die Castings.” Transactions American Foundrymen's Society 69 1961
- Colwell Donald L. Oldrick Tichy “Machinability of Aluminum Die Castings.” Transactions American Foundrymen's Society 64 1956
- Dunn Ray P. Warren Y “Magnesium Effect on the Strength of A380.0 and 383.0 Aluminum Die Casting Alloys.” Transactions Society for Die Casting Engineers Paper #G-T75-015 1975
- Colwell Donald L. “Zinc in Aluminum Casting Alloys.” Transactions American Foundrymen's Society 60 1952
- Mangalick Mahesh C. “Demagging Aluminum” Die Casting Engineer Jan.-Feb. 1974
- Machinability Data Book 2nd Machinability Data Center, Metcut Research Associates, Inc. Cincinnati, Ohio 1972
- Queener C. A. Mitchell W. L. “Effect of Iron Content and Sodium Modification on the Machinability of Aluminum Alloy Die Castings.” Modern Castings Feb. 1965