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Prediction of heat transfer and microstructure in high-pressure die-cast A383 aluminum alloy

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dc.contributorBrewer, Luke
dc.contributorWang, Ruigang
dc.contributorMulani, Sameer
dc.contributorMonroe, Charles A.
dc.contributor.advisorNastac, Laurentiu
dc.contributor.authorKarkkainen, Mikko
dc.contributor.otherUniversity of Alabama Tuscaloosa
dc.date.accessioned2020-01-16T15:03:33Z
dc.date.available2020-01-16T15:03:33Z
dc.date.issued2019
dc.descriptionElectronic Thesis or Dissertationen_US
dc.description.abstractPredicting the microstructure of the as-cast HPDC (high-pressure die cast) product is valuable, because micro-scale features often determine its mechanical properties. To predict the microstructure, the effect of processing parameters such as pressure and cooling rates must be known. The object of this study is to create state-of-the-art models for predicting heat transfer in the HPDC process, and apply those models to predict the evolution of one feature of the microstructure: the size of polyhedral α-Fe intermetallic phase. In the study, we develop a new empirical correlation for the Nusselt number in water cooling channels. This can be used to validate heat transfer coefficients for water cooling channels in commercial software to assist in modelling heat transfer in the HPDC process. Additionally, we develop a model for impact pressure in HPDC, which augments the state-of-the-art Hamasaiid model for peak IHTC (interfacial heat transfer coefficient) in HPDC, and relaxes some of their empirical assumptions. We integrate the IHTC model as a custom boundary condition in FLUENT 18.1 using SCM and UDF-files. Finally, we predict the size of polyhedral Fe-rich intermetallics using commercial casting simulation NOVAFLOW&SOLID for cooling rates and classical solidification theory for intermetallic size, and validate the results using optical micrograph size measurements.en_US
dc.format.extent147 p.
dc.format.mediumelectronic
dc.format.mimetypeapplication/pdf
dc.identifier.otheru0015_0000001_0003388
dc.identifier.otherKarkkainen_alatus_0004D_13880
dc.identifier.urihttp://ir.ua.edu/handle/123456789/6445
dc.languageEnglish
dc.language.isoen_US
dc.publisherUniversity of Alabama Libraries
dc.relation.haspartSupplementary materials include mathematica notebook file
dc.relation.hasversionborn digital
dc.relation.ispartofThe University of Alabama Electronic Theses and Dissertations
dc.relation.ispartofThe University of Alabama Libraries Digital Collections
dc.rightsAll rights reserved by the author unless otherwise indicated.en_US
dc.subjectMaterials science
dc.subjectComputational physics
dc.subjectEngineering
dc.titlePrediction of heat transfer and microstructure in high-pressure die-cast A383 aluminum alloyen_US
dc.typethesis
dc.typetext
etdms.degree.departmentUniversity of Alabama. Department of Metallurgical and Materials Engineering
etdms.degree.disciplineMetallurgical/Materials Engineering
etdms.degree.grantorThe University of Alabama
etdms.degree.leveldoctoral
etdms.degree.namePh.D.

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