Only the addition of Sc and Mo altered the structure of the oxide surface and promoted the consumption of the air in the trapped bubble in the 2L99 aluminium alloy melt. Sand casting was subsequently conducted for 2L99 alloy with different element additions. Statistical analysis confirmed that such improvement was significant. For the castings with Mo addition, a nitride was found in some double oxide film defects, on the fracture surface of the tensile testbars. This was unusual, as bi-film defects in aluminium castings usually have a short solidification time and do not have enough time to consume the majority of their entrapped oxygen.
The formation of the permeable nitride surface layer on the bifilm defect might promote the consumption of the entrapped gas.
Khalid, H. Abdullah, I. Masood, M.
Ibrahim, M. Mohd Noor, M. Yusof, S. Jamian, S. Salleh, W. Siswanto and W.
Wan Muhammad. Tijjani et al.
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- sand casting research | Casting (Metalworking) | Foundry.
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United States Patent. Principles of Foundry Technology, 4th Ed.
Refractories, Manufacture, Properties and Applications. Prentice-Hall, New Delhi. Foundry Technology 2nd ed. Butterworth-Heinemann, Oxford. Principles of Metal Casting 30th reprint. Fundamentals of Metal Casting. Abstract Accurate modeling of the metal casting process prior to creating a mold design demands reliable knowledge of the interfacial heat transfer coefficient at the mold metal interface as a function of both time and location.
Authors: Robert D. Pehlke ; John T. Berry Publication Date: Research Org.
Microstructural modeling of solidification in A alloy - ScienceDirect
Robert D. Pehlke, and John T. United States: N. Copy to clipboard. United States. Pehlke and John T.
A recently completed project involving The University of Michigan and Mississippi State University, together with several industrial partners, which was supported by the USDOE through the Cast Metals Coalition, examined a number of cases of thermal contact.