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HotWorkingTechnology2008,Vol.37,No.20Material&HeatTreatment200810,[1-6]。,,,,。(M→γ),[7-12]。(ECAP)[12-16],,,ECAP,()。1Cr18Ni9Ti(准200mm)。11.1准200mm1Cr18Ni9Ti,1,,TiC,(γ)80~200μm,。1.21Cr18Ni9Ti,1Cr18Ni9Ti,(,710072):1Cr18Ni9Ti,。90%1Cr18Ni9Ti:800℃40min,,6~10μm,,。:;;;:TG142.71:A:1001-3814(2008)20-0024-03StudyonFine-grainedofBulk1Cr18Ni9TiAusteniticStainlessSteelWANGMin,GUOHongzhen(CollegeofMaterials,NorthwesternPolytechnicUniversity,Xi'an710072,China)Abstract:Theultrafinemechanismofbulk1Cr18Ni9Tiausteniticstainlesssteelwasinvestigatedusingmartensitereversaltransformationultrafinegrainmethod.Andtheinfluencesofrecrystallizationannealingtemperatureandholdingtimeongrainsizewereanalyzed.Theresultsshowthattheoptimalrecrystallizationannealingprocessof1Cr18Ni9Tistainlesssteeltoabtain90%coldtransformationisattemperatureof800℃holding40min.Inthiscase,thesizeofγ-grainisminimal(about6~10μm),thebestequilateralgradeisobtainedandthequantityofprecipitatedcarbidesisalsominimal.Keywords:austeniticstainlesssteel;ultrafine-grain;martensitereversaltransformation;coldtransformation:2008-05-30:(1959-),,,,;:029-88493744;E-mail:wangmin@nwpu.edu.cn11Cr18Ni9TiFig.1Microstructureof1Cr18Ni9Tias-received50μm24《》20083720Material&HeatTreatment,,。(ReversalTransformationFine-grained,RTFG)1Cr18Ni9Ti。准200mm1Cr18Ni9Ti准20mm~准22mm,。,90%,600~900℃。、、。22.1,(90%),(M');,,,,。,。,,,,,。,,,。。21Cr18Ni9Ti60%。,,25~38nm,。,,。,90%,90%。2.2,,,。,。,。dd=kGN觶!1/4(1),k;G;N觶。,,G/N觶,,。850~900℃,10μm。,,。,,。,M',。2.33(a)90%1Cr18Ni9Ti准20mm,,(1),,。3(b)~(f)90%1Cr18Ni9Ti60min,。3(a)3(b)~(f),650℃,,,,M23C6;700℃,,;750℃,,;800℃,21Cr18Ni9Ti60%Fig.2TheTEMmicrostructureof1Cr18Ni9Tiafter60%colddeformation0.125μm25HotWorkingTechnology2008,Vol.37,No.20Material&HeatTreatment200810,8~12μm,1(80~200μm),;,,。2.4490%1Cr18Ni9Ti,800℃×40min,590%1Cr18Ni9Ti800℃,。45,800℃×40min,,,,6~10μm。:,-。,,-。,-,,。45,,(≤850~900℃),,。3(1)90%,1Cr18Ni9Ti90%,,。(30)50μm4800℃×40minFig.4Microstructureof1Cr18Ni9Tiafterrecrystallizationannealingat800℃for40min5Fig.5Theeffectsofholdingtimeongrainsize181614121086102030405060t/mind/μm:800℃26HotWorkingTechnology2008,Vol.37,No.20Material&HeatTreatment200810(26)(2)90%1Cr18Ni9Ti:800℃×40min。,6~10μm,,。:[1].-[M].:,2003.[2].の[J].と,2000,88(7):359-369.[3],,.[A].1[C].:,1998.[4]NikuyamM,HagiwaraY,NagaiY.ProgressinmetallurgyforultrarefinedsteelinJapan[R].:,2001.[5].[J].,2005,26(1):49.[6]DrozdovaNA.Structureandphasetransformationsincoldstrainedultra-finegrainedtitaniumalloys[A].Titanium99Scienceandtechnology[C].RUAAIA:CRISM“Prometey”,1999.85.[7],.[J].,2000,12(6):29-32.[8],.[M].,1991,(5):9-13.[9].[J].,1994,15(2):27-48.[10],,.[J].,1995,(4):8-11.[11],,,.[J].,2006,18(4):32-36.[12],,,.[J].,2005,26(1):24-26.[13],,,.(ECAE)[J].,2002,(4):32-35.[14],,,.[J].,2002,(2):24-25.[15],,,.[J].,2003,38(12):38-42.[16]SuchJY,KimHS,ParkJW,etal.Finiteelementanalysisofmaterialflowinequalchannelangularpressing[J].Scripta.Mater.,2001,44(4):677-681.1∶1)、15~25s,,。LEICA-DMRX。,。,,,,。。3(1)DP600,DP600,,,。(2)DP600:800℃2℃/s720℃,50℃/s400℃,16.5%,。:[l].[M].:,1999.[2],,,.590MPa[J].,2008,25(1):9-11.[3],,,.CSPC-Mn[J].,2006,23(4):1-3.[4]QuJinbo,DabboussiW,HassaniF,etal.Effectofmicrostructureonthedynamicdeformationbehaviorofdualphasesteel[J].MaterialsScienceandEngineering,2008,(479):93-104.[5],,,.C-Si-Mn[J].,2007,36(10):55-56.[6],.[M].:,1998.102-105.30
本文标题:大块料1Cr18Ni9Ti奥氏体不锈钢的晶粒细化研究
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