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1、CSP带钢生产线生产的含铌微合金化钢的凝固和均
匀化处理后微观结构特性C.I.Garcia+,A.Ruiz-Aparicio+,K.Cho+,马玉平++++,C.Graham++,M.Vazquez+++,L.Ruiz-Aparicio+,A.J.DeArdo++美国匹兹堡大学材料科学与工程系基础金属研究所
++美国Nucor钢厂+++墨西哥HyLSA钢厂++++马鞍山股份钢铁有限公司摘要本文对美国Nucor和墨西哥HyLSA两家薄板坯连铸连轧厂生产的两种商业化的低碳微合金化钢Nucor(0.059%C,0.035%Nb)和
HyLSA
2、(0.069%C,0.063%Nb)的凝固和均热状态下的微观结构特性进行了系统的研究。样品分别取自进入隧道炉之前和出隧道炉
之后,从约1100℃水淬到室温。本文特别关注树枝晶间距(SDAS)的研究,以及Nb对SDAS、沉淀析出物的类型、大小和成
分及奥氏体晶粒的影响。研究结果表明,SDAS随着Nb含量的增加而降低,从薄板坯边缘到中心,SDSA的尺寸范围为40—
250µm;研究中观察到两种主要的沉淀析出物,TiN和呈星形状分布的(Ti,Nb)(C,N);这些析出物分布在枝晶间和晶格内,进均
热炉之前的低Nb含量和高Nb含量的平衡状态奥氏
3、体平均晶粒尺寸分别为750µm和635µm,出均热炉后的分别为680µm和623µm,奥氏体的晶粒尺寸受均热和Ti和/或Nb含量的影响不大。关键词:奥氏体晶粒度,树枝晶间距,微合金元素,沉淀析出,凝固。MicrostructuralCharacterizationoftheSolidificationandEquilibratedMicrostructuresofNb-BearingMicroalloyedSteelsProducedbytheCompactStripProcessing
C.I.Garcia,A.Ruiz-Aparic
4、io,K.Cho,Y.PMa3,C.Graham1,M.Vazquez2,L.Ruiz-Aparicioand
A.J.DeArdoBasicMetalsProcessingResearchInstitute,DepartmentofMaterialsScienceandEngineering,UniversityofPittsburgh,Pittsburgh,PA
15261,USA1.NUCORSteel-Berkeley,P.O.Box2259,MountPleasant,SC29465,USA2.FlatSteelDivisio
5、n,HYLSA,325LosAngelesAve.SanNicolásdelosGarza,N.L.66452,México
3.MaanshanIronandSteelCo.Ltd.,8HongqiZhongRd.,MaanshanCityAnhuiProvince,ChinaABSTRACTAsystematicstudyofthemicrostructuralcharacteristicsofthesolidificationandequilibratedmicrostructuresoftwo
commerciallow-car
6、bonmicroalloyedthinslabcaststeelsproducedbyNucor(0.059%C,0.035%Nb)andHyLSA
(0.069%C,0.063%Nb)wasconducted.Samplessectionedfromthecontinuouslythinslabcaststeelswerewater
quenchedtoroomtemperaturefromabout1100℃eitherpriortoorafterequilibratinginthetunnelfurnace.Of
particul
7、arinterestinthisstudywastheevaluationofthesecondarydendritearmspacing(SDAS);theeffectofNb
contentonSDAS;thetype,sizeandcompositionoftheprecipitates;andtheaustenitegrainsize.Theresultsindicate
thattheSDASdecreaseswithincreasingNbcontent.TheaverageSDASvaluefromtheedgetothe
8、centeroftheslab
variedapproximatelyfrom40to250µminsize.Twomajortypesofprecipitateswereobserved,TiNandco