35CrMoA钢激光淬火_渗氮复合处理微观组织与性能(1)

371Vol.37,No.120101CHINESEJOURNALOFLASERSJanuary,2010:025827025(2010)012025020635CrMoA2(,257061)35CrMoA2,(OM)X(XRD)(TEM)/,,,,Cr2NFe3C/2Fe3N,2Fe2NFe2O3,Cr2N2Fe4N,FeN,2Fe,,/,,,/,,;;;;TG665Adoi:10.3788/CJL20103701.0250MicrostructureandPropertiesof35CrMoASteelinLaserQuenching2NitridingChengYiyuanWangYongHanBinLiMeiyan(CollegeofMechanicalandElectronicEngineering,ChinaUniversityofPetroleum,Dongying,Shandong257061,China)AbstractLaserquenchingandnitridingtreatmentareperformedon35CrMoAsteel,andthemicrostructure,hardnessandwearresistanceoflaserquenching/nitridedlayerwereinvestigatedbymeansofopticalmicroscope(OM),X2raydiffractomer(XRD),transmissionelectronmicroscope(TEM),microhardnesstesterandwearequipmentcomparedwiththegasnitridedlayers.Theresultsshowthat,bothnitridedlayerconsistof,,Cr2NandFe3C.Thecontentof2Fe3Nishigherinthelaserquenching/nitridedwhitelayerwhilethecontentsofthebrittle2Fe2NandFe2O3arelowerthanthatofthegasnitridedlayer,andtheCr2Nparticlesaremuchfiner.Theultralatticestructureexistin2Fe4Ninthediffusionlayer,inwhichtheFeandNatomarrangeorderly.Therearephaserelation,coherenceandcompatibilitybetween2Fe4Nand2Fe.Sphericalparticlesofcementiteareformedinlowerstripbainite.Thescratchinwornsurfaceoflaserquenching/nitridedlayerisshallow,butthegasnitridingwornsurfacehasdeepplowfurrowandflaking.Afterlaserquenching/nitridingtreatment,thedepthofthenitridedlayerincreases,andhardnessaswellaswearresistanceareimproveddramatically.Keywordslasertechnique;nitriding;microstructure;micro2hardness;wearresistance:2009205214;:2009206210:863(2006AA09A104):(1970),,,,E2mail:[e-mail]:(1964),,,,E2mail:[e-mail]145#,35CrMo,38CrMoAl,,,,,,1:35CrMoA2,[1],,,12,10,[2],[3],,,[4,5],,[6,7],35CrMoA2,,,2235CrMoA,8500.5h,5600.3h,70mm10mm,0.8m,DL2HL2T5000CO2,10mm1mm,2000W,2000mm/min,20%,NH3,,80/h,530,10h,200M22000,2,45#,55HRC,3.5%NaCl,400r/min,500N,ESJ20524,0.1mgMBA21000,H2800(TEM),X(XRD),LEO21450(SEM),HX21000T,200g33.11,35CrMoA()()()23m,1(a)2,12m,35CrMoA,,1(b)1(a);(b)/Fig.1Microstructuresofdifferentnitridedlayers.(a)gasnitridedlayer;(b)laserquenching/nitridedlayer3.22(a)(b)35CrMoA/XRD,,2Fe2N,2Fe3NCr2N,2Fe2N,2Fe3NCr2N79.95%,14.74%5.31%,/25.03%,69.45%5.52%,Cr2N2Fe3N,,2Fe2N,,/2Fe2N,2Fe3N152372X(a);(b)/Fig.2X2raydiffractionofdifferentnitridedlayers.(a)gasnitridedlayer;(b)laserquenching/nitridedlayer3.33(a),(b)/TEM,[3(a)],Fe2O3,200,,FeFe2O3,/,[3(b)]3TEM(a);(b)/Fig.3TEMimagesandelectrondiffractionpatternofdifferentnitridedcompoundlayers.(a)gasnitridedlayer;(b)laserquenching/nitridedlayer4Cr2NTEM(a);(b)/Fig.4TEMimagesofCr2Nandelectrondiffractionpatternsofdifferentnitridedlayers.(a)gasnitridedlayer;(b)laserquenching/nitridedlayer4(a),(b)/Cr2NTEMCr,MoFe,,CrN,Cr2N,MoNMo2N[8],Cr2N,,/Cr2N,Cr2N,Cr2N,,,1012cm-2[9]2521:35CrMoA2,,,,,,,,,,,,,[10]3.45TEM5(a),(b),2Fe2Fe/[11],35CrMoA,,,N,N,,,,5(b),2Fe4N,1/2,2/2Fe4N,FeN2Fe4N,5(b)2Fe4N[001]2Fe[001],:(100)2Fe4N(110)2Fe,/,2Fe,,5TEM(a);(b)/Fig.5TEMimagesandelectrondiffractionpatternsofdiffusionlayersbydifferentnitridedtreatments(a)gasnitridedlayer;(b)laserquenching/nitridedlayer62FeFe3CTEM(a);(b)/Fig.62FeandFe3CsTEMimagesandelectrondiffractionspotofdifferentnitridedlayers.(a)gasnitridedlayer;(b)laserquenching/nitridedlayer6(a)(b)/2FeTEM6(a),,,,,,,/,,[12],3.57/35237,,/100HV,0.2mm,/0.3mm7Fig.7Hardnessdistributionofdifferentnitridedlayers,,,,[13],(530),,N[14],N,,8,/,,,200min,8Fig.8Wearlossesofdifferentnitridedlayers,99(a)(b),9(a),;9(b)/9(a);(b)/Fig.9Wornmorphologiesofdifferentnitridedlayers.(a)gasnitridedlayer;(b)laserquenching/nitridedlayer45#,,,,,;,,;,,/,,/2Fe3N,,Cr2N,,4,/2Fe2N,2Fe3N,Fe2O3,Cr2N,2Fe4N,FeN,2Fe,,,/,,4521:35CrMoA21W.Moller,S.Parascandola,T.Telbizovaetal..Surfaceprocessesanddiffusionmechanismsofionnitridedofstainlesssteelandaluminium[J].SurfaceandCoatingsTechnology,2001,136(123):73792ZhongMinlin,LiuWenjin.Leadingareasandhottopicsongloballasermaterialsprocessingresearch[J].ChineseJ.Lasers,2008,35(11):16531659,.[J].,2008,35(11):165316593A.A.Peligrad,E.Zhou,D.Mortonetal..Transienttemperaturebehaviouranddynamicprocessmodelsinlasersurfacemeltingofclaytiles[J].SurfaceandCoatingsTechnology,2003,150(1):15234BeiDuohui,LJian,GuJianfengetal..Effectsofsurfacenanocrystallizationpro2treatmentongasnitridedbehaviorofmildsteel[J].TransactionofMaterialsandHeatTreatment,2002,23(1):1924,,.[J].,2002,23(1):19245XiShoumou,ZhangJianguo,SunXiaoyanetal..Laserquenching+nitridedcompoundtreatmentof38CrMoAlAsteels[J].ChineseJ.Lasers,2004,31(6):761764,,.38CrMoAlA+[J].,2004,31(6):7617646LiuFurong,GaoQian,WangGuangshengetal..Studyoncompositetreatmentof38CrMoAlAsteelbylaserandnitriding[J].AeronauticalManufacturingTechnology,2003,3:6567,,.38CrMoAlA[J].,2003,3:65677ZhangLingfeng,ChenWeiping.Effectoflaserpre2treatmentonthestructureandpropertyofnitridinglayer[J].MetallurgicalCollections,2005,(2):1113,.[J].,2005,(2):11138ZhouShangqi,HouQiong,RenQin.Microstructureofionnitridinglayerin38CrMoAlsteel[J].HeatTreatmentofMetals,2002,27(10):1012,,.38CrMoAl[J].,2002,27(10):10129XieZhiyu,PanYuxian.Themechanismoftransformationhardeningand