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Thermal convection within superheated liquid metal cavitiesRastegar, Freidoon 08 1900 (has links)
No description available.
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Semi-analytical and numerical modeling of microsegregation for solidifying metallic alloysUddin, Salah. January 2008 (has links)
In this study, two semi-analytical models of microsegregation were developed to predict the concentration fields of solute in the liquid and solid regions for dendritic solidification of binary metallic alloys. Both models assume that the growing dendrites are cylindrical in shape. This assumption is more realistic compared to the common assumptions of plate-like dendrites that most of the earlier researchers employed in their microsegregation modeling study. The solute redistribution profile, in the developing solid layer, necessary to determine the back diffusion parameter was derived from Fick's second law for the model without coarsening. The application of this parameter in a wide range of conditions and the use of its basic form in the model with coarsening was verified. The concept of coordinate transformation and enhancement of back-diffusion Fourier number were used in deriving the model which took into account the coarsening of dendrites. The models are then extended to deal with rapid solidification, peritectic transformations and multi-component systems and the results were compared with relevant experimental data. A good agreement between the model predictions and experimental results was found. / The second part of this study was focused on developing a fully numerical microsegregation model. The numerical model built upon a previously proposed phase change model which relied upon a coordinate transformation technique. The model was extended to deal with moving boundaries with solute diffusion. A suitable computational procedure was developed to solve the model equations which are strongly coupled to each other. To verify the accuracy of the present algorithm with regard to the capability of tracking the moving interfaces, analytical solution of the Stefan problem was used for verification purposes. A good agreement between the model predictions and the analytical solution was found. Evolution of concentration fields during solidification was calculated in the growing solid as well as in the shrinking liquid regions for rectangular, cylindrical and spherical dendrite geometries. The effects of various cooling conditions and relevant parametric values on microsegregation were analyzed and discussed.
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A computer imaging method for fluid motion studies in metal castingPoland, John H. 17 August 1993 (has links)
Significant reductions in the number of defects in parts
produced by investment casting can be obtained by improving
the flow of the molten metal during pouring. Studies have
been done at Oregon State University with simulated casting
techniques to determine optimal mold configurations.
Better mold layouts have been shown to improve this flow.
The purpose of this project was to develop a computer
imaging system that would aid in reliably evaluating these
experiments. The completed system consisted of a computer,
a frame grabber, video equipment and operating software.
Videotapes made of the fluid flow in the mold during the
pouring process were replayed into the computer and
evaluated. Custom software reduced the collected data to a
representative evaluation number.
Results show that the computer evaluations are reliable
and reproducible, but applications are limited because of
the cost, speed and power of available computer systems. / Graduation date: 1994
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Application of reverse engineering and rapid prototyping to castingKolar, Venkat Deepak. January 2008 (has links)
Thesis (M.S.)--Cleveland State University, 2008. / Abstract. Title from PDF t.p. (viewed on July 3, 2008). Includes bibliographical references (p.56-57). Available online via the OhioLINK ETD Center. Also available in print.
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Procedures for predicting pressures inside coresWinardi, Leonard. January 2007 (has links) (PDF)
Thesis (Ph. D.)--University of Alabama at Birmingham, 2007. / Title from PDF of title page (viewed October 13, 2009). Additional advisors: J. Barry Andrews, Gregg M. Janowski, Peter M. Walsh, Srinath Viswanathan, Harry E. Littleton. Includes bibliographical references (p. 207-209).
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Suitability of layer manufacturing technologies for rapid tooling development in investment casting /Hugo, Philip January 2008 (has links)
Thesis (MScIng)--University of Stellenbosch, 2008. / Bibliography. Also available via the Internet.
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An investigation on the suitability of layer manufacturing methods for rapid tooling development in investment casting of light metal alloysDeez, Brent Steven January 2010 (has links)
Thesis (MTech (Mechanical Engineering))--Cape Peninsula University of Technology, 2010. / The research presented in this report focuses on Investment Casting capabilities for light metal alloys in
South Africa and forms part of the Advanced Manufacturing Technology Strategy's (AMTS): Light Weight
Metals flagship programme.
The research is centred on the suitability of rapid prototyping (RP)/Iayer manufacturing (LM) methods to
produce patterns for the investment casting of aluminium (AI), magnesium (Mg) and titanium (Ti) alloys,
together known as Rapid Investment Casting. Three core RP technologies are investigated namely:
Three Dimensional Printing - Drop-on-Bed from Z-corporation, Three Dimensional Printing - Drop-on-
Drop from ThermoJet - 3D Systems and Selective Laser Sintering from EOS.
Various RP/LM processes are discussed in detail and highlight the technologies selected in this study. A
standard benchmark part, adapted from the European project framework FP6, designed and utilised in
similar studies is used as the basis for the research.
The Investment Casting process is discussed fully and compared to the Rapid Investment Casting, listing
both the advantages and disadvantages of the above mentioned methods.
In addition a special study has been conducted on investment casting of large components using layer
manufactured patterns. This study not only helped to establish and validate the shrinkage value
calculated for the aluminium castings but also showed substantial capability lacks in SA foundries to
handle this type of components, which are by definition most often of high added value.
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Semi-analytical and numerical modeling of microsegregation for solidifying metallic alloysUddin, Salah. January 2008 (has links)
No description available.
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Reflectance map techniques for analyzing surface defects in metal castingsWoodham, Robert James January 1977 (has links)
Thesis. 1977. Ph.D.--Massachusetts Institute of Technology. Dept. of Electrical Engineering and Computer Science. / MICROFICHE COPY AVAILABLE IN ARCHIVES AND ENGINEERING. / Bibliography : p. 185-189. / by Robert J. Woodham. / Ph.D.
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Semi-solid slurry formation via liquid metal mixingFindon, Matthew M. January 2003 (has links)
Thesis (M.S.)--Worcester Polytechnic Institute. / Keywords: thixocasting; SSM; semi-solid processing; liquid metal mixing; rheocasting. Includes bibliographical references (p. 88-90).
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