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1、附录一英文翻译原文EFFECTofIONNITRIDINGONtheMICROSTRUCTUREANDPROPERTIESofMARAGINGSTEEL(250GRADE)KishoraShettyS.Kumarb,P.RaghothamaRao;RegionalCentreforMilitaryAirworthiness(FoundryandForge),CEMILAC,DRDO,Bangalore-560037,IndiaDepartmentofMaterialsEngineering,IndianInstituteofScience,Bangal
2、ore-560012,IndiaReceived25June2008.Accepted28November2008.Availableonline10December2008AbstractInthepresentinvestigation,ionnitridingofMaragingsteel(250grade)hasbeencarriedoutatthreedifferenttemperaturesi.e.,at435℃,450℃and465℃for10 hdurationinordertoachievegoodwearresistancealon
3、gwithhighstrengthrequiredfortheslattrackcomponentofaircraft.Themicrostructureofthebasematerialandthenitridedlayerwasexaminedbyopticalandscanningelectronmicroscope,andvariousphasespresentweredeterminedbyX-raydiffraction.Variousproperties,suchas,hardness,casedepth,tensile,impact,f
4、atiguepropertiesandcorrosionresistancewereinvestigatedforbothun-nitridedandion-nitridedmaterials.ItisobservedthatthemicrostructureofthecorematerialremainsunalteredandFe4Nisformedinthehardenedsurfacelayerafterionnitridingatallthethreetemperaturesemployed.Surfacehardnessincreasess
5、ubstantiallyafterionnitriding.Surfacehardnessremainsalmostthesamebutcasedepthincreaseswiththeincreaseinionnitridingtemperatureduetogreaterdiffusivityathighertemperatures.Tensilestrength,fatiguestrengthandcorrosionresistanceareimprovedbutductilityandenergyabsorbedinimpacttestdecr
6、easeonionnitriding.Theseresultsareexplainedonthebasisofmicrostructuralobservations.Thepropertiesobtainedafterionnitridingat450 °Cfor10 harefoundtobeoptimumwhencomparedtotheothertwoionnitridingtemperatures.Keywords：Ionnitriding;Maragingsteel;Microstructure;Casedepth;Tensileproper
7、ties;Fatigueproperties1.IntroductionSurfaceengineeringmeans‘engineeringthesurface’ofamaterialorcomponenttoconfersurfaceproperties,whicharedifferentfromthebulkpropertiesofthebasematerial[1].Thepurposemaybetoreducewear,minimizecorrosion,increasefatigueresistance,reducefrictionalen
8、ergylosses,actasadiffusionbarrier,providetherma
