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477Vol.47No.7 20117921—926ACTAMETALLURGICASINICAJul.2011pp.921–926 ∗ ((),110016) , ,,800—8505min7.5/min,.OM, XRD,σ,,σ, SEM γ/δδ. ,,,σ TG142.71,TG156A0412−1961(2011)07−0921−06 INVESTIGATIONONHEATTREATMENTOFADUPLEX STAINLESSSTEELFORNUCLEARPOWER PLANTIMPELLER LIANGTian,KANGXiuhong,HUXiaoqiang,LIDianzhong ShenyangNationalLaboratoryforMaterialsScience,InstituteofMetalResearch,ChineseAcademyofSciences, Shenyang110016 Correspondent:HUXiaoqiang,assistantprofessor,Tel:(024)23971973,E-mail:xqhu@imr.ac.cn SupportedbyInvestigationonFundamentalIssuesofStainlessSteelsfromSYNL,IMR,CAS Manuscriptreceived2011–03–23,inrevisedform2011–04–12 ABSTRACTEffectsofheattreatmentonmicrostructureandmechanicalpropertyofacastdu- plexstainlesssteelusedasmakingimpellerofseawatercircularpumpinnuclearpowerplantwere investigated.Theresultsdemonstratethattheimpactenergyandelongationdecreasesharplywhen heat–treatedtimewaslongerthan5minat800—850orwhenthecoolingratewaslessthan σ 7.5/min.ThephaseshavebeenidentifiedthroughSEMandXRD.Theweaknessofthe mechanicalpropertiesisattributedtotheprecipitationofσphase.Withincreasingagingtime, theσphasecoarsenedandthenucleationpositionmovedfromtheγ/δinterfacesintothewhole ferritephase. KEYWORDSduplexstainlesssteel,heattreatment,mechanicalproperty,σphase σ ,, [4,5] ,.,.( σ 1150). [1−3] .,, σ . *() , KGCX2–YW–221 σ