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1、???????????????????????????????????????????????????????????????????JOURNALOFIRONANDSTEELRESEARCH,INTERNATIONAL?2015,22(6):457G463????????????????????????????????????????????????????????????????????ACoupledThermodynamicModelforPredictionofInclusionsPrecipitationduringSolidifi
2、cationofHeatGresistantSteelContainingCerium1,ChengGjunLIU1,ChunGlongLI2,MaoGfaJIANG1YanGdongLI(1.KeyLaboratoryforEcologicalMetallurgyofMultimetallicMinerals(MinistryofEducation),NortheasternUniversity,Shenyang110819,Liaoning,China;2.BaotouIronandSteel(Group)Company,Baotou014
3、010,InnerMongolia,China)Abstract:AcoupledthermodynamicmodelofinclusionsprecipitationbothinliquidandsolidphaseandmicrosegGregationofsoluteelementsduringsolidificationofheatGresistantsteelcontainingceriumwasestablished.ThenthemodelwasvalidatedbytheSEManalysisoftheindustrialpro
4、ducts.ThetypeandamountofinclusionsinsolidificaGtionstructureof253MAheatGresistantsteelwerepredictedbythemodel,andthevaluableresultsfortheinclusionscontrollingin253MAsteelwereobtained.Whentheceriumadditionincreases,thetypesofinclusionstransformfromSiO2andMnStoCe2O3andCe2O2Sin
5、253MAsteelandtheprecipitationtemperatureofSiO2andMnSdecreaGses.TheinclusionsCeSandCeNconverttoCe2O3andCe2O2SastheoxygencontentincreasesandCe2O3andCeNconverttoCe2O2S,Ce3S4,andMnSasthesulfurcontentincreases.TheformationtemperatureofSiO2increaseswhentheoxygencontentincreasesand
6、theMnSprecipitationtemperatureincreaseswhenthesulfurcontentincreaGses.Thereisonlyasmallquantityofinclusionscontainingceriumin253MAsteelwithhighcleanliness,i?e?,lowoxygenandsulfurcontents.Bycontrast,amassofSiO2,MnSandCe2O2Sareformedinsteelwhentheoxygenandsulfurcontentsarehigh
7、enough.TheconditionthatMnSprecipitatesin253MAsteelis1?2w[O]+w[S]>0?01%andSiO2precipitateswhen2w[O]+w[S]>0?017%(w[S]<0?005%)andw[O]>0?006%(w[S]>0?005%).Keywords:heatGresistantsteel;rareearthsteel;inclusion;microsegregation;solidification;thermodynamicmodelSymbolListfi———Activ
8、itycoefficient;T———Temperature,K;ej———FirstGorderinteractionparameter;TL,TS