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简介：Theinfluenceofingotsegregationonquenchingdistortionofgearsteelwasinvestigatedinthispaper.Theresultsshowthattheshapeofingotsegregationofrodsteeldependsontheshapeofcontinuouscasting(CC)molds,andthatthedistortionofgearsteelwithsquareingotsegregationisuniform,whilethatofgearsteelwithrectangularingotsegregationisanisotropic.Afterquenching,theoutercircleoftheringsamplewithalargerectangularsegregationareaisdistortedintoanovalshape.NoobviouselementsegregationhasbeenfoundintherodsteelproducedthroughtherectangularCCmold.Obviousdifferenceindensityhasbeendetectedatthecrosssectionofrodsteel.Itsuggeststhatcenterporositymaybethemainreasonforthestrongimpactofsegregationonheattreatmentdistortionofgearsteel.

简介：Duringtheingotcastingprocess,theparametricchangesofthemoltensteelpouringprocessoftencausebothingotsurfaceandinternalqualitydefects.Withtheincreasinglywideapplicationofcomputersinindustrialtechnology,numericalsimulationsofthemoltensteelpouringprocessenablepredictionsofthedefectsthatwillariseduringthepouringandsolidificationprocess,especiallyforthemoltensteelflowduringtheearlystagesofcasting.Inaddition,usingacomputertosimulatethecastingprocessofa40tingotandsolidificationcanpreventmanydefects.Thesimulationresultsindicatethatcontrollingthepouringspeedtolessthan80kg/s,hangingthecastingpowderinamoldwiththehangingheightmaintainedat100-150mm,andcontrollingthetaperangleofthemoldbrickoutlettoasuitablelevelcanreducetheprobabilityofslagentrapmentandimprovetheinternalandsurfacequalityoftheingot.

简介：Withthecontinuousimprovementofproductqualityandfunction,thequalitycontrolofmoldsteelisbecomingincreasinglystricter.Argonprotectionisessentialforensuringcastingqualityduringingotcasting.Thedevelopmentofargonprotectioniningotcastingandtheproductionprocessofenclosedargonprotectionin40tlineisdiscussed,withparticularfocusgiventhefactorsaffectingtheflowofoxygenintheargonprotectioncoverarediscussed.Theinfluenceofsomerelatedfactorsontheoxygencontentisanalyzed.Onthebasisoftheonlinemeasurementsoftheoxygencontent,theoptimizedoperationalapproachesforimprovingtheeffectofargonprotectionaredeveloped.Thiscandecreasetheliquidsteelviasecondaryoxidation,andimprovethequalityoftheingots.

简介：Acontinuummodelproposedfordendritesolidificationofmulticomponentalloys,withanypartialsolidbackdiffusion,wasusedtonumericallysimulatethemacroscopicsolidificationtransportphenomenaandmacrosegregationsinanupwardsdirectionallysolidifiedplaincarbonsteelingot.Thecomputationalresultsofeachmacroscopicfieldofthephysicalvariablesinvolvedinthesolidificationprocessatamiddlesolidificationstagewerepresented.

简介：Amodelcombinedbothmacroscopictransportandmicrostructuralevolutionisappliedtodescribetheinfluenceofthermosolutalconvectiononmicrostructuralevolutionduringthesolidificationprocess.Firstly,thevolumeaveragemethodandSimpleralgorithmareusedtosolvethemacroscopictransportequation.Thenthecalculatedresultsareincorporatedintothecellularautomaton(CA)modeltosimulatethemicrostructuralevolution.Usingthismodel,asimplecastingingotisappliedtosimulatemicrostructuralevolution.Throughthesimulation,itisfoundthatthethermosolutalconvectionhasastronginfluenceontheredistributionoftemperaturefieldandsolutefield,whichinfluencethesolidificationmicrostructuralevolution.

简介：TheeffectofrepeatedmeltingofthemotheringotonthethermalstabilityofaZr60All5Ni25glassyalloywasinvestigatedbydifferentialscanningcalorimetry(DSC).Experimentalresultsindicatethataftertherepeatedmeltingoftheingotsat1300and1580K,theglasstransitiontemperatureTgin.easesfrom686.4to690.7and696.8KandtheonsettemperatureofcrystallizationTxfrom757.9to758.6and763.4K,respectively,indicatingthatthethermalstabilitybecomeshigheraftertherepeatedarcmeltingofthemotheringotandthatitismoreeffectiveathighertemperature.Withintheframeworkofstructureheredity,theoriginoftheimprovementofthethermalstabilityofZr60AllsNi25bulkglassyalloyisdiscussed.

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