Title of article :
EffectofVandNbonprecipitationbehaviorandmechanicalpropertiesofhighCrsteelOriginalResearchArticle
Author/Authors :
TakashiOnizawa، نويسنده , , TakashiWakai، نويسنده , , MasanoriAndo، نويسنده , , KazumiAoto، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2008
Abstract :
EmploymentofhighCrsteelasamainstructuralmaterialisconsideredasawaytoachieveeconomicalcompetitivenessoffastbreederreactors.VandNbarebelievedtoimprovethehightemperaturestrengthofhighCrsteelsbyprecipitatingascarbidesand/ornitrides,namelyfineMXparticles.However,thelongtermefficiencyandstabilityofsuchprecipitationstrengtheningmechanismsprovidedbythefineMXparticleshavenotbeenclarifiedyet.AseriesoftrialproductscontrollingVandNbcontentsisproducedandmechanicaltestsareconductedtoinvestigatetheeffectoftheseelementsonthemechanicalpropertiesandthelongtermstabilityoftheMXstrengtheningmechanism.Beforeandafteralongtermagingprocess,metallurgicalexaminationsandquantitativeanalysesareconductedtoinvestigatetheeffectoftheseelementsonmicrostructureevolutions.Basedontheseresults,thelongtermefficiencyandstabilityofthestrengtheningmechanismsprovidedbythefineMXparticlesarediscussed.HigherstrengthandlowerductilityareobtainedwiththeincreasesofVandNbcontents,althoughtheinfluenceofNbcontenttendstobesaturatedatabout0.01mass%.MXdoesnotgrowandanynewprecipitatescannotbeobservedafteragingat873Kfor6000h.Therefore,itisexpectedthatMXisstableafteragingat823Kforapproximately167,000hbasedonLarson-Millerparameter.
Journal title :
Nuclear Engineering and Design Eslah
Journal title :
Nuclear Engineering and Design Eslah
