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A Mathematical Model to Prediction of the Formation of Microporsities in Aluminium Alloy Cast Parts

Bahmani, Ahmad | 2009

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 39062 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Varahram, Naser; Davami, Parviz
  7. Abstract:
  8. Today, application of aluminium alloys in industries is developing. And this is because of some specification of these alloys like high proportion of the Strength per weight. One of the most useful alloys of this alloy group is A356 alloy that contain 7 % Silicon and 0.4 Percent of magnesium, this alloy because of cast ability, heat treat ability specification is use developing in air and automotive industries. But usage of this alloys combined with some difficulties like low fluidity and formation of shrinkage and gas porosities in this alloys. In present work with programmer software Visual Fortran, based on Finite difference method, a simulation model has been developed, can solve heat conservation, continuity and gas conservation equations and some microstructural parameters, to solve porosity formation in casting. Moreover of comparison of the model with others works, 4 sample were cast, porosity of them measured with a setup of experiment based on Archimedes rule, and porosity results of experiment with simulation comprised for two initial gas content and also two different cooling condition. Also porosity results for an industrial cast (Wheel ring) are used to investigate the ability of the model to simulate complex parts. Comparison of simulation results with experiments showed a good agreement, and finally it can be said that this model, because of considering real conditions of the solidification, can be used for academic researches of solidification phenomena and industrial cases for modification of technology design
  9. Keywords:
  10. Numerical Modeling ; Simulation ; Segregation ; Gases Separation ; Dendrite Arm Space (DAS) ; Microporosity

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