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1、AbstractAbstractGearisabasiccomponentinthemechanicalequipment.Theforceofthegearisquitecomplexasitworks,avarietyoffailuremodesareinduced,whichrequiresthegearwithhighstrength,highwearresistanceandcorrosionresistance,etc.Withtherapiddevelopmentinthefieldofavi
2、ation,aerospaceandautomobile,especiallyinrecentyears,therequirementofthegeartendstobelargetransmissionratio,highefficiency,lownoise,lightweight,smallsize,etc.Improvingthesurfacepropertyofagearandprolongingitsservicelifehasbecomethevitalthingsinpublicconcer
3、n.Toprolongagear’slifespan,besidesoptimizingthetransmissionstructure,thebasicwayistoincreasethemanufacturingprecisionandsurfacefinishingdegree.Themainfailuremodeisdedendumrupturecausedbythesurfacefatiguecrack.Thereisalargerelationbetweenthemicrocrackandthe
4、surfaceroughness.Ifthestrengthandtoughnessishighenoughinthecorepartofagearandthesurfacepropertyisgood,thelifespanwillbelargelyprolonged.Withtherapiddevelopmentofgearsurfacetreatmenttechnology,massofsurfacemodificationtechniqueshavebeenwidelyadopted.Includi
5、ngcarburizing,nitriding,carbonitriding,surfacealloying,lasersurfacehardening,thermalsprayingandsurfacetreatmentcompoundtechnologies.High-currentpulsedelectronbeams(HCPEB)isanewkindofsurfacemodificationtechnique,whichpossesseshighefficientandhighenergydensi
6、ty.Thesurfacestructure,propertiesofsurfacelayerofsamplescanbeimproveddirectlyandeffectively.ThisarticlearisesacontentoftheprojectofNationalNaturalScienceFoundationofChina,―thestudyonprocessandpropertyofsurfaceamorphizedgears‖(No.50775229).Theoptimizingproc
7、esswasstudiedthroughthetreatmentofgearmaterialbyusingHCPEB,inordertoobtainthegearswithhighstrengthandductility,improvedwearandcorrosionresistanceandlongerlifespan.Themainworksofthethesisareasfollow:(1)Thenumericalsimulationofthetemperaturefieldintheprocess
8、ofmaterialsurfacemodificationbyHCPEB.Thefiniteelementanalysis(FFA)softwareANSYSwasappliedtosimulatetheprocessofmodificationandobtainedthetemperaturedistribution,thestarttimeofmelting,thethicknessofthemeltedla
