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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,Indi
2、anInstituteofScience,Bangalore-560012,IndiaReceived25June2008.Accepted28November2008.Availableonline10December2008AbstractInthepresentinvestigation,ionnitridingofMaragingsteel(250grade)hasbeencarriedoutatthreedifferenttemperaturesi.e.,at435℃,450℃and465
3、℃for10 hdurationinordertoachievegoodwearresistancealongwithhighstrengthrequiredfortheslattrackcomponentofaircraft.Themicrostructureofthebasematerialandthenitridedlayerwasexaminedbyopticalandscanningelectronmicroscope,andvariousphasespresentweredetermin
4、edbyX-raydiffraction.Variousproperties,suchas,hardness,casedepth,tensile,impact,fatiguepropertiesandcorrosionresistancewereinvestigatedforbothun-nitridedandion-nitridedmaterials.ItisobservedthatthemicrostructureofthecorematerialremainsunalteredandFe4Ni
5、sformedinthehardenedsurfacelayerafterionnitridingatallthethreetemperaturesemployed.Surfacehardnessincreasessubstantiallyafterionnitriding.Surfacehardnessremainsalmostthesamebutcasedepthincreaseswiththeincreaseinionnitridingtemperatureduetogreaterdiffus
6、ivityathighertemperatures.Tensilestrength,fatiguestrengthandcorrosionresistanceareimprovedbutductilityandenergyabsorbedinimpacttestdecreaseonionnitriding.Theseresultsareexplainedonthebasisofmicrostructuralobservations.Thepropertiesobtainedafterionnitri
7、dingat450 °Cfor10 harefoundtobeoptimumwhencomparedtotheothertwoionnitridingtemperatures.Keywords：Ionnitriding;Maragingsteel;Microstructure;Casedepth;Tensileproperties;Fatigueproperties1.IntroductionSurfaceengineeringmeans‘engineeringthesurface’ofamater
8、ialorcomponenttoconfersurfaceproperties,whicharedifferentfromthebulkpropertiesofthebasematerial[1].Thepurposemaybetoreducewear,minimizecorrosion,increasefatigueresistance,reducefrictionalenergylosses,actasadiffusionbarrier,providetherma
