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《2015. A Coupled Thermodynamic Model for Prediction of Inclusions Precipitation during Solidification of Heat-resistant Steel Containing Cerium》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。
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
