IntheProduetionofthegrain一oriented3%51steel,itsmagnetieProPertiesdePendehieflyontheProcessofseeondaryrecrystallizationinwhichtheinhibitionbydisPersePartielestothenormalgrowthofPrimarygrainsPlaysavitalrole.Inthisfield,anumberofworksontheoretiealanalysis,aswellasonTEMexPeriments,havebeenPub-lished!l一6].TheinelusionfaetorintroducedbyFlowers[7]hasProvidedquantitativedatafordeseribingtheinhibitionbyPartielesofvarioussizestograingrowth,buttheresultswereobtainedonlyfrom3%51一Fedecarbon-izedsheetsProdueedinvariousProeesses.InthePresentinvestigation,thesizedistribu-tionsofdisPersivePartieles,whiehresolveoreoarsenatelevatedtemPeratures,arestatistieallyanalyzedatdifferentstagesofsecondaryrecrystallization,andtheeritiealinclusionfaetor15evaluatedtoelarifytheirdynamiebehaviourofinhibition.1.ExPer加entalProeeduresTwogrouPsofsPeeimensweretakenoutofdeearbonisedsheetsinconventional3%51steel,andtheirehemicaleomPositions(wt一%)arerespeetively:PglZ,Mn0.08,S0.024;P576,Mn0.10,50.008.AnnealingtreatmentwasearriedoutinatemPerature一gradientfurnaee.Inthehearththere15aheat一resistingsteeltubewhieh151600mminlengthandseParatedintosixheatingregions,andtheirtemPerature15con-trolledbyDWT一700controller.ThesPeei-menswereeneaPsulatedinthehearthwithmixedgasof75%HZand25%NZ.ThesPee-imens(500x100x0.35mm)wereannealedfor5or90min,thendragedintothewater一coolingeavityandquenehed.ThetemPeraturesinheatingregionsofthehearthwereverifiedwiththermaleouPlestoberesPeetively865,925,975,1025and1085.AfterboilingthesesPecimensindiluteH