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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,IndianInstituteofScie
2、nce,Bangalore-560012,IndiaReceived25June2008.Accepted28November2008.Availableonline10December2008AbstractInthepresentinvestigation,ionnitridingofMaragingsteel(250grade)hasbeencarriedoutatthreedifferenttemperaturesi.e.,at435℃,450℃and465℃for10 hdurationinordertoachievego
3、odwearresistancealongwithhighstrengthrequiredfortheslattrackcomponentofaircraft.Themicrostructureofthebasematerialandthenitridedlayerwasexaminedbyopticalandscanningelectronmicroscope,andvariousphasespresentweredeterminedbyX-raydiffraction.Variousproperties,suchas,hardn
4、ess,casedepth,tensile,impact,fatiguepropertiesandcorrosionresistancewereinvestigatedforbothun-nitridedandion-nitridedmaterials.ItisobservedthatthemicrostructureofthecorematerialremainsunalteredandFe4Nisformedinthehardenedsurfacelayerafterionnitridingatallthethreetemper
5、aturesemployed.Surfacehardnessincreasessubstantiallyafterionnitriding.Surfacehardnessremainsalmostthesamebutcasedepthincreaseswiththeincreaseinionnitridingtemperatureduetogreaterdiffusivityathighertemperatures.Tensilestrength,fatiguestrengthandcorrosionresistanceareimp
6、rovedbutductilityandenergyabsorbedinimpacttestdecreaseonionnitriding.Theseresultsareexplainedonthebasisofmicrostructuralobservations.Thepropertiesobtainedafterionnitridingat450 °Cfor10 harefoundtobeoptimumwhencomparedtotheothertwoionnitridingtemperatures.Keywords：Ionni
7、triding;Maragingsteel;Microstructure;Casedepth;Tensileproperties;Fatigueproperties1.IntroductionSurfaceengineeringmeans‘engineeringthesurface’ofamaterialorcomponenttoconfersurfaceproperties,whicharedifferentfromthebulkpropertiesofthebasematerial[1].Thepurposemaybetored
8、ucewear,minimizecorrosion,increasefatigueresistance,reducefrictionalenergylosses,actasadiffusionbarrier,providetherma
