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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,Bangalore-560012,In
2、diaReceived25June2008.Accepted28November2008.Availableonline10December2008AbstractInthepresentinvestigation,ionnitridingofMaragingsteel(250grade)hasbeencarriedoutatthreedifferenttemperaturesi.e.,at435℃,450℃and465℃for10 hdurationinordertoachievegoodwearresistancealongwithhighstrengthrequiredf
3、ortheslattrackcomponentofaircraft.Themicrostructureofthebasematerialandthenitridedlayerwasexaminedbyopticalandscanningelectronmicroscope,andvariousphasespresentweredeterminedbyX-raydiffraction.Variousproperties,suchas,hardness,casedepth,tensile,impact,fatiguepropertiesandcorrosionresistancew
4、ereinvestigatedforbothun-nitridedandion-nitridedmaterials.ItisobservedthatthemicrostructureofthecorematerialremainsunalteredandFe4Nisformedinthehardenedsurfacelayerafterionnitridingatallthethreetemperaturesemployed.Surfacehardnessincreasessubstantiallyafterionnitriding.Surfacehardnessremains
5、almostthesamebutcasedepthincreaseswiththeincreaseinionnitridingtemperatureduetogreaterdiffusivityathighertemperatures.Tensilestrength,fatiguestrengthandcorrosionresistanceareimprovedbutductilityandenergyabsorbedinimpacttestdecreaseonionnitriding.Theseresultsareexplainedonthebasisofmicrostruc
6、turalobservations.Thepropertiesobtainedafterionnitridingat450 °Cfor10 harefoundtobeoptimumwhencomparedtotheothertwoionnitridingtemperatures.Keywords：Ionnitriding;Maragingsteel;Microstructure;Casedepth;Tensileproperties;Fatigueproperties1.IntroductionSurfaceengineeringmeans‘engineeringthesurf
7、ace’ofamaterialorcomponenttoconfersurfaceproperties,whicharedifferentfromthebulkpropertiesofthebasematerial[1].Thepurposemaybetoreducewear,minimizecorrosion,increasefatigueresistance,reducefrictionalenergylosses,actasadiffusionbarrier,providetherma
