Engineering Metallurgy by The Committee on Metallurgy

By The Committee on Metallurgy

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5. , Comparison of Methods for Characterizing Porosity in Die Castings, Report No. ERC / NSM-91-51-C, The Ohio State University Engineering Research Center for Net Shape Manufacturing, August 1991. 6. , Lubricant Gasification as a Contributing Factor to Porosity in Die Casting, Masters Thesis, The Ohio State University, Columbus, 1992. 7. , The Effects of Porosity on the Tensile Properties of Die Cast Aluminum Alloys B390 and B380, Master’s Thesis, The Ohio State University, Columbus, 1992. 8. , Decomposition and Gasification Characteristics of Die Casting Plunger Lubricants, Report No.

Even when the gases are compressed, the porosity can manifest as blisters at a later time. This most often occurs during heat treatment. In some cases, conventional die casters choose not to vent gases from the die at all. In such cases, all gases must be compressed into the component. Although this may produce acceptable components for certain applications, such practices do not produce high integrity products. Vacuum die casting is a high integrity die casting process that utilizes a controlled vacuum to extract gases from the die cavities, runner system, and shot sleeve during metal injection.

An Introduction to Transport Phenomena in Materials Engineering, Macmillan, New York, NY, 1992. , J. Courtois, R. Evans, G. Farrior, C. Kyonka, A. Koch, K. Young. ‘‘Semisolid Metal Casting and Forging,’’ in Stefanescu, D. , Vol. 15, Casting, ASM International, Materials Park, OH, 1988, p. 327. , ‘‘Semi-solid Metal Cast Automotive Components: New Markets for Die Casting,’’ Paper Cleveland T93-131, North American Die Casting Association, Rosemont, IL, 1993. Siegert, K. and R. Leiber. ‘‘Thixoforming of Aluminum,’’ SAE Paper Number 980456, Society of Automotive Engineers, Warrendale, PA, 1998.

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