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1、MaterialsTransactions,Vol.50,No.9(2009)pp.2242to2246#2009TheJapanInstituteofMetalsPhysicalPropertiesofIron-OxideScalesonSi-ContainingSteelsatHighTemperatureMikakoTakeda1,TakashiOnishi1,ShouheiNakakubo1andShinjiFujimoto21MaterialsResearchLaboratory,KobeSteel,Ltd.,Kobe651-2271,
2、Japan2GraduateSchoolofEngineering,OsakaUniversity,Suita565-0871,JapanThemechanicalpropertiesofoxidescalesathigh-temperaturewerestudiedinordertoimprovethesurfacequalityofcommercialSi-containinghighstrengthsteels.SpecificoxidesofFe2O3,Fe3O4,FeOandFe2SiO4weresynthesizedbypowderme
3、tallurgy.TheVickershardness,thermalexpansioncoefficientandthermalconductivityweremeasuredathigh-temperatures.Aseriesofmeasurementsconfirmedthatthephysicalpropertiesofthesynthesizedoxidesweredifferenteachother.FromtheVickershardnessmeasurements,itwasverifiedthatthehardnessofeachsyn
4、thesizedoxidewasidenticalwiththenaturally-formedironoxide,asobservedinthecross-sectionofoxidescalesonsteels.TheinfluenceoftheFe2SiO4formedonSi-containingsteelsonthescaleadhesionathightemperatureandthesurfacepropertyisdiscussedonthebasisofthephysicalpropertiesoftheoxides.[doi:1
5、0.2320/matertrans.M2009097](ReceivedMarch18,2009;AcceptedJune4,2009;PublishedAugust25,2009)Keywords:high-temperatureoxidation,oxidehardness,oxidethermalexpansioncoefficient,oxidethermalconductivity,silicon-containingsteel,FeO,Fe3O4,Fe2O3,Fe2SiO4,adhesion,surfaceproperty1.Introd
6、uctioncurves.7,8)Inthesestudies,tensile-testspecimensofpureironwerecompletelyoxidizedunderfixedconditionsandTheironoxidescalesthatformonbilletsandslabsofhot-tensiletestsatfixedstrainrateswereconductedtoobtaintherolledsteelsareusuallydetachedusingahydraulicdescalingdeformationan
7、dfracturebehaviour.process.However,residualprimaryscalesorsecondaryAlthoughknowledgeofsuchhigh-temperaturemechanicalscalesthatformafterthedescalingprocessremainonthepropertiesofoxidescalesisbeneficial,theirmechanicalsteelsurfacethroughsubsequenthot-andcold-working,thenproperti
8、eshavebeenlessextensivelystudiedbecausehigh-influencethesurfacequalit
