The oxidation of iron-aluminum alloys.pdf

《The oxidation of iron-aluminum alloys.pdf》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。

1、OxidationofMetals,Vol.38,Nos.1/2,1992TheOxidationofIron-AluminumAlloysR.Prescott*andM.J.Graham*ReceivedJune1,1991ThispaperbrieflysummarizesstudiesrelatedtotheoxidationofFe-Alalloys.Emphasisisplacedonoxidephasecomposition,morphology,andthedevelop-mentofprotectivec~-A1203scalesonoxidation-resi

2、stantFe-Alalloysbothwithandwithoutternaryadditions.KEYWORDS:Fe-A1alloys;oxidation;scalemorphology;ternaryadditions.INTRODUCTIONInordertodevelopanunderstandingofthemechanismsinvolvedintheoxidationofalumina-formingalloys,itisreasonabletobeginbyexaminingthebinaryFe-A1system.Fe-A1alloyshavebeeno

3、finterestsincetheearly1930%whenitwasrealizedthatadditionsofA1ledtoimprovementsinthescalingresistanceofironandsteels.HauttmanIreportedthattheheatresistanceofsteelsat1000~improvedmarkedlywhentheA1contentwasraisedtobetween4-9%.Ziegler2notedanimprovementinperformancewithincreasingA1contentinstud

4、iesonFe-A1-Calloysandclaimedthatalloyswith8%A1werecomparableinoxidationresistancetoNi-Cralloys.OtherworkersalsonotedthatadditionofA1broughtaboutimprovedscalingpropertiesintherange900-1200~3anditwasobservedthatoxidationtookplaceinaccordancewithaparabolicratelaw.4SykesandBampfylde5concludedtha

5、tthepercentageofA1requiredtogivecompleteprotectionisdependentontemperature,with6%A1beingsufficientat900-1000~9%isnecessaryatll00~and11%at1300~*InstituteforMicrostructuralSciences,NationalResearchCouncil,Ottawa,K1A0R9Canada.730030-770x/92/0800-0073506.50/0~)1992PlenumPublishingCorporation74Pr

6、escottandGrahamInmorerecentyears,furtherresearchhasbeendirectedtowardobserva-tionsofoxidemorphologiesandanalysisofreactionproductswithaviewtoexplainingtheoxidationbehaviorofFe-A1alloysandthegrowthmechan-ismsofthescalestheyform.BeforegoingontodiscusstheoxidationofFe-A1alloys,itispertinenttoou

7、tlinethenatureofthephasesthatmayexistinsuchalloysandtorefertotheirmechanicalproperties,whicharedependentlargelyonthephasespresent.THEFe-AIBINARYSYSTEMA1isonlyslightlysolubleinface-centeredcubicFeanddissolutionofabout1.5%A1issufficienttosuppressthef