铸钢轧辊电火花沉积YG8涂层的组织结构和性能

YG8王建升孟惠民樊自栓俞宏英孙冬柏,100083,YG8,WC,.:Fe3W3CCo3W3CW2CFe7W6C;,Fe7W6W2C;1331HV;23;,.;;;;TG178MicrostructureandpropertiesoftheYG8ESDcoatingonacaststeelrollWANGJiansheng,MENGHuimin,FANZishuan,YUHongying,SUNDongbaiSchoolofMaterialsScienceandEngineering,UniversityofScienceandTechnologyBeijing,Beijing100083,ChinaABSTRACTTheYG8electrodewasdepositedonthesurfaceofacaststeelrollbyelectrosparkingdeposition(ESD)andformedaWCcoating.Themicrostructureandwearresistanceofthecoatingwereinvestigated.TheresultsshowthatthecoatingconsistsofFe3W3C,Co3W3C,W2CandFe7W6phases,andismetallurgicallybondedwiththecaststeelrollsubstrate.TheFe7W6andW2Chardphasesdispersedlydistributedinthecoatingwithnanosizedparticles.Theaveragehardnessofthecoatingis1331HV.Thecoatinghasimprovedresistanceperformancewhichis23timeshigherthanthecaststeelsubstrate.Thewearmechanismismainlyfatiguewear.Finehardphasesdistributedinthecoatingdispersedlyarethemainfactorsleadingtothehighhardnessandwearresistanceofthecoating.KEYWORDSelectrosparkingdeposition;coatings;roll;microstructure;wearresistance:20081022:(No.2006DFA52240):(1973),,,Email:[e-mail];(1963),,,(electrosparkdeposition,ESD),,(,WCTiC)(),(),10-5~10-6s8000~25000,,,[1]..,,,[2-3].,,,[4-9],,.,.,,,..WC-8Co,,31920099JournalofUniversityofScienceandTechnologyBeijingVol.31No.9Sep.2009(),,,..111,1.YG8,WCCo.DZS-4000,,2500r!min-1,.,2.1()Table1Chemicalcompositionofthecaststeelroll%SiCMnSP2000680950040082Table2ESDprocessparameters/W/V/Hz/(min!cm-2)240012020002,,7L!min-1,3mm.12(Rigaku)DPMax2RBX(XRD).LEO1450(SEM),XRD.,HVS1000,300N,20s.HT-600,.30mm∀30mm∀10mm,6mmYG8,15N,1200Hz,30min;1∀10-4gAEL-200.221XRDX.1YG8X.1XRDFig.1XRDpatternsofESDcoatingsX,Fe3W3CCo3W3CW2CFe7W6C.W2CWC,Fe3W3CCo3W3CFe7W6CWC.(2(c)),.,,.,.222YG8SEM,20m(2(a)).2(a),,,.2(b),WC,XRD,.,,(2(a)(hole))(2(b)(crack)).,,,.!1153!9:YG8,,.,,,,,.2(b)(columnar)(dendritic).2(b)(d),(ultrafinegrainarea),.:,;,;,[10].,.2YG8SEM.(a);(b)Zone#;(c)Zone∃;(d)Zone%Fig.2CrosssectionSEMimagesoftheYG8coating:(a)crosssection;(b)Zone#;(c)Zone∃;(d)Zone%2(a)(c),.ABC(3),WFeCoC,:AW,Fe;BFe,Co;CC,FeB,CoA,WB.XRD,AW2C,BFe7W6C,CFe3W3CCo3W3C.,Fe3W3CCo3W3C,Fe3W3CCo3W3CFe7W6W2C(2(c)),W2C.2(b),,.,,,.[11],GRG/R.,G,,,(2(b)!1154!3132(c)ABC.(a)A;(b)B;(c)CFig.3EDXspectraofParticlesA,BandCinFig.2(c):(a)ParticleA;(b)ParticleB;(c)ParticleC(columnar));,GG/R,,,,,,.,,,[12](2(b)(dendritic)).4Fig.4Microhardnessdistributionofthecoating234HSV1000.:,13906HV,1331HV,;.,,,,,.245.:30min,;,.,,,,,,,,3,,,,.,,,,,.,,.5Fig.5FrictioncoefficientoftheESDcoatingandsubstrate3.3,00010g!r-1,00023g!r-1.:W=!WS/!Wm=27/12=23,W;WS,g;Wm,g.23.!1155!9:YG83Table3Resultsofabrasivetest/g/g/g/(g!r-1)18620018618812000101864831864562700023:,,.6.6(a):&∋,;,[13].6(b):,,,,,.,,.6Fig.6FrictionmorphologiesoftheESDcoating3(1)YG8,Fe3W3CCo3W3CFe7W6CW2C;W2CFe7W6Fe3W3CCo3W3C,.(2).,20m;.(3),,13906HV,13310HV.(4),23.,.[1]ZhengC,ZhouY,Surfacemodificationofresistanceweldingelectrodebyelectrosparkdepositedcompositecoatings:Part#.Coatingcharacterization.SurfCoatTechnol,2006,201(3):1503[2]LesnjakA,TusekJ.Processesandpropertiesofdepositsinelectrosparkdeposition.SciTechnolWeldJoin,2002,7(6):391[3]WangPZ,PanGS,ZhouY,etal.Acceleratedelectrosparkdepositionandthewearbehaviorofcoatings.JMaterEngPerform,1997,6(6):780[4]ArvindA,NarendraBD.Pulseelectrodedepositionofsuperhardboridecoatingsonferrousalloy.SurfCoatTechnol,1998,106(2):242[5]GalinovIV.InvestigationofthecompositionofAg,NiandAgNipseudoalloycoatingsappliedbyelectrosparkalloyingonaCusubstrate.SurfCoatTechnol,1993,56(2):131[6]RibalkoAV,SahinO.Theuseofbipolarcurrentpulsesinelectrosparkalloyingofmetalsurfaces.SurfCoatTechnol,2003,168(2):129[7]ParkanskyN,BeilisII,RapoportL,etal.ElectrodeerosionandcoatingpropertiesinpulsedairarcdepositionofWCbasedhardalloys.SurfCoatTechnol,1998,105(1):130[8]WangRJ.InterfaceBehaviorStudyofWCCoCoatingbyElectroSparkDepositiononTitaniumAlloySurface[Dissertation].Harbin:HarbinInstituteofTechnology,2005:84(.WC-Co[].:,2005:84)(1163)!1156!311988)[7]GongXJ.CorrosionandProtectionofPowerPlantEquipment.Beijing:ChinaElectricPowerPress,1998(..:,1998)[8]Xi(anThermalPowerResearchInstituteCoLtd,BeijingElectricPowerConstructionCoLtd.DL/T7942001ChemicalCleaningGuideforSteamPowerPlant.Beijing:ChinaElectricPowerPress,2001(,.DL/T7942001.:,2001)[9]LuXH,ZhaoGX,YangYQ,etal.StudyontheCO2corrosionelectrochemicalcharacteristicsof13Crsteelathightemperatureandpressure.MaterEng,2004(10):16(,,,.13CrCO2.,2004(10):16)[10]CaoCN.CorrosionElectrochemistry.Beijing:ChemicalIndustryPress,1988(..:,1994)(1156)[9]WangJS,WangHK,ZhongY,etal.Thetechnologyofelectrosparkdepositionanditsapplication.MachMetCutting,2004(1):34(,,,..:,2004(1):34)[10]QiaoSR,HanD,LiJ,etal.Extrafinestructureobtainedbyelectricalsparkdischargequenchingonsteelsurface.MaterMechEng,2004,28(8):7(,,,..,2004,28(8):7)[11]WangXL,ShiSH,ZhenQG.Studyonsolidificationfeatureandthesolidificationmicrostructurecontroloflasercladdinglayer.ApplLaser,2001,20(3):164(,,..,2001,20(3):164)[12]ZhangWY.WeldingMetallurgy.Beijing:ChinaMachinePress,1995(..:,1995)[13]StaiaMH,FragielA,CruzM,et