Control of intermetallic compound layers at interface between steel and aluminum by diffusion-treatment.pdf

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1、MaterialsScienceandEngineeringA338(2002)44
/53www.elsevier.com/locate/mseaControlofintermetalliccompoundlayersatinterfacebetweensteelandaluminumbydiffusion-treatmentShigeakiKobayashi*,TakaoYakouDepartmentofMaterialsEngineering,GraduateSchoolofEngineering,YokohamaNationalUniversity,79

2、-5Tokiwadai,Hodogayaku,Yokohama240-8501JapanReceived22October2001;receivedinrevisedform10December2001AbstractThetougheningofFe
/Alintermetalliccompoundcoatingformedbyaluminizingofcarbonsteelwasinvestigated.Thegrowthmechanism,morphologyandmechanicalpropertiesofFe
/Alintermetalliccompo

3、undlayersonthesurfaceofcarbonsteelweresystematicallyevaluatedforspecimensdiffusedattemperaturesrangingfrom873to1323Kafterhotdipaluminizing.Fe2Al5wasmainlyformedonthespecimensurfacesattheusualdiffusiontemperaturesfrom873to923K.However,FeAlandFe3Allayershavingrelativelyhighfractureresi

4、stanceandoxidationresistancepropertieswerepreferentiallyformedinthespecimensdiffusedattemperaturesgreaterthan1273K.TheactivationenergiesrequiredforthegrowthoftheFeAlandFe3AllayerswereQFeAl/1801andQFeAl/260kJmol,respectively.ItwasidentifiedthattheformationandgrowthofFe
/Alintermeta

5、lliccompoundlayersis3controlledbythediffusionofFeatomsintotheintermetalliccompoundlayers.#2002ElsevierScienceB.V.Allrightsreserved.Keywords:Fe
/Alintermetalliccompound;Aluminizediffusiontreatment;Interface;Hardnessdistribution;Crackinitiation;Brittleness1.Introductionaluminumandsteel

6、substratebythediffusionofironatomsdiffusedintothealuminumlayer,andtheFe2Al5ThecontrolofintermetalliclayersisimportantforlayeristhenformedattheinterfacebetweentheFeAl3improvinginterfacialstrengthinprocessingtechniqueslayerandsteelsubstrate.TheFe2Al5layeradjacenttoconcernedwiththeinter

7、facialreactionbetweensteelandthesteelsubstratedevelopsatongue-likemorphologyaluminumsuchaswelding,diffusionbondingandhot[5
/7].IthasbeenreportedthatthegrowthoftheFe2Al5dipcoating[1].Studieshavealreadyexaminedthelayerisdiffusion-controlled,andtheactivationenergychemicalcompositionsand

8、growthkineti