熱型連鑄銅單晶凝固組織形成的模擬研究.pdf

1、西安工業(yè)大學(xué)碩士學(xué)位論文熱型連鑄銅單晶凝固組織形成的模擬研究姓名：劉振亭申請學(xué)位級別：碩士專業(yè)：材料加工工程指導(dǎo)教師：范新會20080515NumericalSimulationfortheStructuresofHeatedMouldContinuousCastingSingleCrystalCopperinSolidificationProcessesDiscipline：MaterialsProcessingEngineering

2、StudentSignature：SupervisorSignature：。k沈批卜Ⅺ∥AbstractThedevelopmentandshortcomingsofthestructuresimulationmodelsinmetalsolidificationprocess，involvingthedeterministicmodel，theprobabilitymodelandthephasefieldmodel，havebeen

3、reviewed，andthemicrostructureevolutioninsolidificationprocessofheatedmouldcontinuouscasting(HMCC)issimulatedbycellularautomation(CA)modelBysimulatingtheprocessofgrainnucleationandgrowthofsinglecrystalcopperwiresmanufactu

4、redbyHMCC，thetransformationprocessfromliquidtosolidcanbetraced，thegrainshapeandsizecanbequantitativelypredicted，andtheperfectstructurecouldbeobtainedbyadjustingthetechnologicalparametersOnthebasisofanalyzingthemanufactur

5、eprocessofsignalcrystalcontinuouscasting，thecorrespondingmathematicalphysicsmodelhasbeenestablishedandthemicrostructureevolutionofsinglecrystalcopperinsolidificationprocessandtheeffectsofthetechnologicalparametersonsimul

6、ationresultshavebeenconductedbyCAmodelMoreoverthedifferencebetweenthesimulationresultsandtheexperimentalresultshasbeencomparedandanalyzedThesimulationresultsshowthatthecrystalcompetitivegrowthisthemechanismofsinglecrysta

7、lstructureevolution，theshapeandpositionoftheliquid—solidinterfaceinHMCCplayanimportantroleontheprocessofsinglecrystalstructureevolutionandthesimulationresultsareingoodagreementwiththeexperimentalresultsThetemperaturefiel

8、dofsignalcrystalcontinuouscastinghasbeenestablishedandcalculatedTheeffectsofthemaintechnologicalparametersontheshapeandpositionoftheliquidsolidinterfacehavebeenanalyzed，andtheresultsrevealthatthecontinuouscastingspeedand

9、thecoolingconditionhavemoreobviousinfluencethanthemouldtemperatureontheshapeandpositionoftheliquid—solidinterface，andtheeffectofthemelttemperatureisnotnotableWiththeincreaseofthecontinuouscastingspeed，theliquidsolidinter

10、facemovesfromtheinteriortotheexteriorofthecastingmould，whentheinterfaceshapefactordecreasesandtheprotuberanceintheinterfacewillbecomeflatWiththeincreaseofthecoolingdistance，theliquid—solidinterfacerapidlymovesawayfromthe

11、castingmouldandtheinterfacebecomessmoothItisindicatedthatlongcoolingdistancemakesthecoolingcapacitydropgreatlyandresultsinthesinglecrystaldifficulttoformThemouldtemperaturehasthesameeffectontheshapeandpositionoftheliquid