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20*(710049)TG115.5+1TG113.25+1A1007–9289(2002)03–0020–0414µm[1]100g0.1~5kg5kg1IndentationSizeEffect[2]*59971035(1978)(),2002031120020528CrN1Fig.1TheschematicillustrationofIndentationsizeeffect21/71/10[3]136d220023(56)21d/30.5(d/7)Berkovich2c(a)(b)(c)2Fig.2ConfigurationofVickers,Knoopandberkovichindenters1IBEDCrN1.7µmGCr1520g50g1(10-7Pa)Table1HardnessmeasuredundervariousindentersandloadsP/gHVDHv/µmHKDHk//µm508801.479300.91209200.9011500.5213–-3Nanoindenter™S3CrN13.5mNPD1/70.23µm0.14310-3Pa3CrNFig.3Theloading-displacementcurveofCrNthinfilm3(1)d/nmP/mN22(2)–4[4,5](1)(2)(3)JonssonHogmark[5]44[6]4Af,(1)AfAsA=As+AfAf/AAs/A(2)tdCHd(3)kH0HfoHsoHc=Hso(4)HfoKcKs(3)Hso(3)(4)-H-d-1KcKsHsoC[7]4Fig.4Areaequivalentmodel56CrN1MH-550g100g200g300g500g1000g56JHCrN0.12510-3PaJHJHssffHAAHAAHc+=22)(2dtCdtCAAf-=dkHH/0+=tKKHHscsofo2-+=20023(56)235Fig.5Relationshipbetweenhardnessandload6Fig.6Relationshipbetweenhardnessandreciprocalvalueofindentationdiagonal5[8][1]IostA,BigotR.Indentationsizeeffect:realityorartefact[J]?JournalofMaterialsScience.1996:313573-3577.[2],.[J]..1995,31(1):B45-50.[3]SunY,BellT,ZhengS.Finiteelementanalysisofthecriticalratioofcoatingthicknesstoindentationdepthforcoatingpropertymeasurementsbynanoindentation[J].ThinSolidFilms.1995,258:198-204.[4]JonssonB,HogmarkS.Hardnessmeasurementsofthinfilms[J].ThinSolidFilms,1984,114:257-269.[5]BurnettPJ,RickerbyDS.Themechanicalpropertiesofwear-resistantcoatings:IModellingofhardnesshavior[J].ThinSolidFilms.1987,148:51-65.[6]KorsunskyAM.etal.Onthehardnessofcoatedystems[J].SurfaceandCoatingsTechnology1998,99:171-183.[7],,.TiC,N[J]..1995,31(9):B429-434.[8]MusilJ,KuncF,ZemanH,etal.Relationshipsbetweenhardness,Young’smodulusandelasticrecoveryinhardnanocompositecoatings[J].SurfaceandCoatingsTechnology2002,154:304-313.710049E-mail:miyanyu@mailst.xjtu.edu.cnP/g×107Pa/×107PaIIItemperinghadhigherhardnessandbetterwearcorrosionresistance,andthetechnologicalprocessesweresimplifiedaswell.Keywards:boronized-carburized-nitridiedlayertungstencarbidehighcarbon&highchromiumcastironsurfacinglayerwearcorrosionresistanceEvaluationofhardnessmeasurementmethodsforthinfilmsMIYan-yu,HUNai-sai,HEJia-wen,CHENHua(20~23)Abstract:TheconventionalVickershardnessmeasurementforthinfilmscannotgetridfromtheinfluenceofsubstrateandtheresolutionofsmallindentationisalsopoor.Nanoindentorisamoderninstrument,whichcanprovideaprecisecontrolandaccuratemeasurementofindentationdepth.Bycontrollingtheindentationdepth,theeffectofsubstrateonfilmhardnesscanbeeliminated.Themeasure-menterrorofindentationdepthismuchlessthanthatofindentdiagonal.However,nanoindentorrequireswellpreparedsurfacewithlowroughnessofspecimen,andthisinstrumentisexpensive,thatlimitsitsapplicationinindustry.Onemethodstudiedinthispapermaybeavailableforsomespecialcases.ThecompositehardnessofcoatedspecimencanbemeasuredbytheconventionalVickershardnesstesterwithrelativelyheavyload,thentheintrinsichardnessofthinfilmcanbecalculatedusingapropermodel.Thismethodwouldbeasuitablewayforindustrialapplications.Keywords:thinfilm;compositehardness;microhardness;nanoindentorExperimentalResearchonElectrochemicalPolishingwithMagneticFieldFANGJian-cheng,JINZhu-ji,XUWen-ji,ZHOUJin-jin(24~26)AbstractProceedingfromtheforcedbehaviorandmotionstateofchargedionsinelectromagneticfield,theeffectofmagneticfieldondissolvingspeedofanode,diffusionvelocityofproduct,removalrateofmaterialsandinterelectrodescurrentdensitywasstudiedthroughexperiments,thentheagitationofelectrolytebymagneticfieldwasdiscussedaswell.Theresultsshowthat(1)boththeLorentz’forceandelectricfieldforce,changedthemotiontrackanddirectionofions,raisedthedissolvingvelocityandproductdiffusionvelocityonthepeakpointsorsidefacesoftheanode,andthenthesurfaceroughnesswasimprovedefficiently.(2)themagneticfield,enharscedthepolishingspeedatpeakpointsratherthanatvalleypoints,thatifbeneficialtoreduceinitialwearwhenthemachinedworkpiecewasadopted,thisphenomenonisalsoofadvantagetoreducedamageofsubstrate.(3)Theagitationeffectofmagneticfieldenhancedtheliquid-phaseconvection,ionsdiffusionandtransference,acceleratedtheelectrochemicalreactionspeed,thereforethecurrentintensitywasincreasedandthefinishingefficiencywasalsoraised.Keywords:magneticfield;electrochemicalpolishing;surfaceroughnessTwoMethodsofFrictionCoefficientpredictionofslidingbearingmaterialsYANGHai-feng,ZHOUXin-yu,ZHANGHong-sheng,LIJie,HAIJin-tao(27~32)Abstract:Basedontheanalysisofmulti-elementnon-linearregressionmodelandBPnetworkmodel,thefrictioncoefficientofslidingbearingmaterialswaspredictedbythepower-lawcurveregressionmodelandBaysianeregularizedBPnetwork.Thereasonsoftheirdifferentresultswereanalysedaswell.TheBPnetworkstructuretrainedbyfull-samplewasproposed.Keywords:multi-elementnon-linearregressionanalysis;BPnetwork;slidingbearingmaterials;frictioncoefficientEffectsofTaIonImplantationbyDifferentMethodsonthePittingCorrosionResistanceofCr4Mo4VandCr12MoVHEHeng,ZHUChuan-jun,LIUNing,TONGHong-hui,(33~35)Abstract:ThispaperstudiedtheeffectsofTaimplantationsbydifferentmethodsonthepittingcorr