List of Speakers SYMPOSIUM: Light Metals for Transportation

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hosted byOctober 27-31, 2013, Montreal, QuebecList of SpeakersRevised: Monday, April 22, 2013SYMPOSIUM:Light Metals for TransportationExamination of these precipitates revealed a number of features, such as: (i) the composition of the precipitates is veryclose to the stochiometric Mg2Si compound; (ii) precipitates are aligned along dislocations; (iii) the precipitate density ismuch higher for the high pressure die castings where the a-Al matrix contains more dislocations than in permanent mouldcastings; (vi) precipitates lie inside the a-Al grains where they are randomly distributed. Between the Mg2Si lamellasprecipitates were not observed; (v) homogenization of the alloy results in complete dissolution of the precipitates andduring artificial aging new needle-shaped precipitates are formed.Modeling of Magnesium DC Casting Process Using a 3D Turbulent CFD ModelID: 73502Type: ContributedSpeaker: Mainul Hasan, McGill University, CanadaAuthor(s): M. Hasan, L. BegumA 3D CFD model of the direct chill (DC) casting of a magnesium rolling slab ingot has been modeled using an in-houseCFD code. The model is based on 3D time-averaged turbulent energy and Navier-Stokes equations and utilizes the‘enthalpy-porosity’ scheme to couple the solidification heat-transfer aspect of the problem with melt flow. Specifically, theDC casting of AZ31 alloy in a hot-top mold has been modeled for the steady state operation. Simulations are carried outfor five different casting speeds , ranging from 60 to 180 mm/min and for two melt superheats of 32C and 64C The meltvelocityand temperature profiles are presented along with the sump depth and sump profile, shell thickness and localheat fluxes along the outer surfaces of the cast. The model can be used to predict the upper limit of the casting speedwhich might lead to an unwanted break-out during production runs.Near Net Shaped Casting of Heat Treatable Al-Zn-Mg-Cu Wrought Alloy by Controlled Diffusion SolidificationProcess (CDS): Microstructure, Mechanical Properties and Heat TreatmentID: 73149Type: StudentSpeaker: Reza Ghiaasiaan, McMaster University, CanadaAuthor(s): R. Ghiaasiaan, X. Zeng, S. ShankarIn Controlled diffusion solidification (CDS), two differently thermal mass precursor alloys are mixed and subsequently theresultant mixture cast into near net shaped cast component. The CDS process enables casting of the Al wrought alloysinto near net shaped components by mitigating the problem of hot tearing through ensuring a non-dendritic morphology ofprimary Al-phase. The study presents the favorable process and alloy parameters for sound shaped casting of 7xxx Alwroughtalloy (Al-Zn-Mg-Cu-(Si)) by the CDS process along with the mechanical tensile properties under various heattreatment conditions. The tilt pour gravity casting process was used for this study to demonstrate the ability to cast highintegrity components with high strength and ductility. In depth microstructure analysis outlining the phased in the cast andheat treated microstructure would also be presented.Numerical approach for development of high elastic casting aluminum alloys.ID: 71987Type: ContributedSpeaker: Kyung-Moon Lee, Hyundai Motor, Korea SouthAuthor(s): K. Lee, H. Lee, H. Park, H. ParkThe elastic modulus of aluminum alloys is important to enhance the stiffness of automobile parts that it could replace theengine block material to aluminum alloy from cast iron. This study is suggested how to make high elastic aluminum alloysusing computational material science (thermodynimic, first pricipal caculation and Eshelby's theory) and evaluatedmechanical properties of reinforced phases (TiB2, AlB2, Al3Ti). The volume fraction, shape, aspect ratio and distributionPage 10 of 17
hosted byOctober 27-31, 2013, Montreal, QuebecList of SpeakersRevised: Monday, April 22, 2013SYMPOSIUM:Light Metals for Transportationof particles effect on the mechanical properties of new aluminum alloy such as elastic modulus and yield/tensile stress.Through these approaches, high elastic modulus aluminum alloys could be developing to adjust the engine blockmaterials.Numerical Modeling and Experimental Validation of AA5000 Series Alloy Strips, Containing Sc and Zr, Cast onthe Horizontal Single Belt Casting (HSBC) MachineID: 73170Type: ContributedSpeaker: Sa Ge, McGill University, CanadaAuthor(s): S. Ge, M. Celikin, M. Isac, R. GuthrieThe Horizontal Single Belt Casting (HSBC) is a near-net-shape casting process in which molten metal is directly cast intothin strips at high cooling rates. This process has been gaining significant traction. It was used in the present work toproduce strips of Al-Mg alloys (AA5000 series). This particular AA5000 series alloy with additions of Sc and Zr, showexceptional potential as structural materials for transportation applications, and are ideal materials to be produced usingthe HSBC process.Computational Fluid Dynamics (CFD simulations using ANSYS FLUENT 14, were carried out toassess various transport phenomena during the casting of Al-Mg-Sc-Zr alloys. Numerical predictions were validatedagainst experimental results. Optical microscopy, SEM and EBSD analyses were conducted to compare the advantagesof Al-Mg-Sc-Zr alloys produced by the HSBC process over those produced conventionally.Numerical Simulation of Flow,Temperature and Composition Variation in the Snout and Sink Roll Region ofContinuous Galvanizing BathsID: 71831Type: ContributedSpeaker: Frank Ajersch, Ecole Polytechnique, CanadaAuthor(s): F. Ajersch, F. Ilinca, F. GoodwinThe snout and sink roll regions of a continuous galvanizing operation are of critical importance in achieving automotivequality coated steel products. Entrainment of dross particles into the coating originating in the snout and in the pinchbetween the strip and sink roll were investigated. Numerical simulations were carried out by introducing a pumping systemwhich can direct flow to these specific ares.Velocity, temperature and compositional gradients were calculated andcompared to the standard configuration not using pumps. The results showed that the quality of the coated steel can beimproved using an imposed flow system.Optimum Ageing Cycles in Multiple-Step Ageing of Aluminum AlloysID: 70927Type: ContributedSpeaker: Adebayo Badmos, Black Hawk College, USAAuthor(s): A. Badmos, A. OdeshiMultiple-ageing of aluminum alloys are usually limited to two steps with no information on the effects of higher number ofsteps. This paper investigates the optimum number of ageing cycles in the multiple ageing of three aluminum alloys,2017, 2024 and 2624 by means of hardness test. The three alloys are aluminum-copper systems with close chemicalcompositions and common strengthening precipitates. The multiple-step aging treatment involves solutionizing andquenching the alloy, reheating the alloy to a lower temperature and pre-aging for a given time, and subsequentlyrepeating the aging step for a number of times at either the same or different temperature from the preceding agingtreatment. The aim is to determine the optimum number of ageing cycles and its dependence on aging temperature andtime.Page 11 of 17
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List of Speakers SYMPOSIUM: Light Metals for Transportation

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