P91钢高温低周疲劳性能研究

120P91(1.7100492.200072)P91(JP91)P91(CP91)P91P91TEMP91:Qin-xinZHAO1,Li-huiZHU2,Hai-ChengGU1,Yan-sunLU1(1.Xi’anJiaotongUniversity,Shannxi710049;2.ShanghaiUniversity,Shanghai200072)Hightemperaturelowcyclefatiguepropertiesareinvestigatedcontrastivelyfor9Cr-1MoVNbNFerriticsteel(JP91madeinJapanandCP91madeinChina).Itshowsthatthecyclicstressresponsecurvesshowrapidinitialsofteningfollowedbygradualsofteninguntilmacroscopiccrackgrowthoccurs.Thestrainamplitudefatiguelifeequationsforbothmaterialswerealsoobtained.TEMthinfoilmicrostructuralanalysisrevealedthatthecyclicsofteningisduetoacombinationofredistributionofdislocationdensityandcarbidecoarseningandalossofsolidsolutionstrengthening.hightemperaturelowcyclefatigue;strainamplitude;fatiguelife;cyclicsoftening9Cr-1MoVNbNP911963198619891998200240P91P91(JP91)P91(CP91)JP91ϕ27340mmCP91ϕ27340mmMayes50KN5mm10mm121-1410-3/sP91600±2X-Yw(C)w(Si)w(Mn)w(S)w(P)w(Cr)w(Mo)w(V)w(Nb)w(N)w(Ni)w(Al)w(Cu)JP910.100.410.400.0010.0138.490.940.210.080.0600.100.01CP910.080.310.490.0040.0128.660.900.200.070.0340.070.030.07Δs/2NNF10020030040050000.20.40.60.81FractionofLifeN/NFStressApititudes/2(MPa)3.251.050.550.380.3CP91et(%)10020030040050000.20.40.60.81FractionofLifeN/NFStressApititudes/2(MPa)3.321.080.550.380.3JP91et(%)12(a)P91NF2(b)NF(1)Basquin1910-Manson-Coffin1960’s-()()ΔΔΔeeesetepfFbfFcENN222=+=+''(1)sf'NF=1bsf'bef'NF=1c122ef'c0.010.1110100100010000100000NFet(%)et-CP91et-JP910.010.1110100100010000100000NFet(%)ee-CP91ep-CP91ee-JP91ep-JP91(a)Δet-NF(b)Δee-NFΔep-NF2CP91JP91tP91((2))P91((3))NF()()ΔetFFNN20212556640054607558=+--....(2)()()ΔetFFNN202008329860041106882=+--....(3)bc(2)(3)CP91JP91CP91bcJP91CP91JP91P91TEM3(a)(b)M23C61.064nmNb,V(C,N)(a)JP91(20000)(b)CP91(20000)3JP91CP9145JP91CP91t=1.05%4(a)5(a)t=0.55%t=0.30%1234(b)5(b)M23C6Nb,V(C,N)P91[2](a)Δet=1.08%(×15000)(a)Δet=1.05%(×15000)(b)Δet=0.30%(×15000)(b)Δet=0.30%(×20000)4JP915CP91(2)M23C6M23C6M23C6M23C6M23C6(3)M23C6V.Foldyna[5]9%Cr12%Cr623CMl124623CM2.0ln85.19048.1483l⋅-=s(4)Sherbyet.al.[6]l3&e∝l36575130Mpa7152TEM8P9167(a)JP91Δet=0.30%(×15000)(b)CP91Δet=0.30%(×20000)8P91tNFCP91JP91JP91Mo-C125[1]GuntzG,JulienM,KottmannG,etal.TheT91book2:ferritictubesandpipeforhightemperatureuseinboilers.RevisionFrance:VallourecIuduxtries,1994.[2]Nagesha,A.,Valsan,M.,Kannan,R.,BhanuSankaraRao,K.andet.al..Influenceoftemperatureonthelowcyclefatiguebehaviourofamodified9Cr-1Moferriticsteel.InternationalJournalofFatigue,2002,24(12):1285-1293.[3]WendellB.Jones.EffectsofmechanicalcyclingonthesubstructureofModified9Cr1Moferriticsteel.In:AshokK,Khare,ed.FerriticsteelsforHighTemperatureApplications.MetalsParkOhio44073.AmericanSocietyforMetals,1983.[4]MatsuokoS,KimS,WeertmanJR.Mechanicalandmicrostructuralbehaviorofaferriticstainlesssteelunderhightemperaturecycling.In:DavisJW,MichelDJ,ed.FerriticAlloysforUseinNuclearEnergyTechnologies.Snowbirdufah:TheMetallurhicalSocietyofAIME,1983.507516.[5]V.Foldyna,A.Jakobova,R.Riman,A.Gemprle,R.Riman,EffectofStructuralFactorsontheCreepPropertiesofModifiedChromiumSteels,CreepandFractureofEngineeringMaterialsandStructures:ProceedingsoftheFourthInternationalConferenceheldatUniversityCollege,Swansea,1St.-6th,April,1990.507-516.[6]O.D.Sherby,Rodney,H.Klundt,andAlanK.Miller.FlowStress,SubgrainSize,andSubgrainStabilityatElevatedTemperature.MetallurgicalTans.A,8A(6):843-850,1990.