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Quantitative assessment of the effect of copper chills on casting/chill interface behavior and the microstructure of sand cast A319 alloy

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dc.contributor.author Farhang Mehr, Farzaneh
dc.date.accessioned 2012-11-16T19:28:48Z
dc.date.available 2012-11-16T19:28:48Z
dc.date.copyright 2012 en_US
dc.date.issued 2012-11-16
dc.identifier.uri http://hdl.handle.net/2429/43592
dc.description.abstract Although the demand for A319 alloy has increased in recent years, thermal fatigue resistance of the alloy is still one of the most important challenges in engine applications, especially in the newer generation of engines in which cylinder spacing has been reduced. According to the previous studies there are several parameters that improve thermal fatigue resistance such as: low SDAS, fine grain size, low porosity level, and low intermetallic content. Cooling rate has a direct effect on the shape, size, and distribution of the microstructural phases, as well as on the scale of the dendrites, and pore size. High cooling rates can improve thermal fatigue resistance, as a result of fine microstructure and small pore size. On the other hand, thin sections of a mold may not properly fill and “Cold Shuts” may result, if high cooling rates are applied. One approach to balance these phenomena is to use a water-cooled chill where water cooling is activated part way through the casting sequence. This type of chill causes a lower cooling rate initially, when the filling procedure is occurring, and after filling, the cooling rate increases to reduce the microstructure size. The results show that this method has the potential to both avoid cold shuts and miss-runs and improve the cast microstructure farther into castings remote from the chill. A mathematical model has been developed in “ANSYS CFX 12.0” to evaluate the effectiveness of this concept quantitatively. The model simulates the behavior of the Casting/chill interface and also predicts the cooling rates resulting from different casting conditions when using solid chill and water-cooled chill. en_US
dc.language.iso eng en_US
dc.publisher University of British Columbia en
dc.title Quantitative assessment of the effect of copper chills on casting/chill interface behavior and the microstructure of sand cast A319 alloy en_US
dc.type Electronic Thesis or Dissertation en
dc.degree.name Master of Applied Science - MASc en_US
dc.degree.discipline Materials Engineering en_US
dc.degree.grantor University of British Columbia en
dc.date.graduation 2013-05 en_US
dc.degree.campus UBCV en_US
dc.description.scholarlevel Graduate en


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