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3D2,,,,,(,150001):,,,ANSYSADPL,,2,,,2:;2;;:TG156199;O242121:A:025426051(2004)0720024205SimulationandCalculationof3DLaserCladdingTemperatureFieldofCeramic2MetalCompositeCoatingsbyFiniteElementMethodYINGLi2xia,WANGLi2qin,CHENGuan2ci,GULe,ZHENGDe2zhi,LIWen2zhong(SchoolofMechatronicsEngineering,HarbinInstituteofTechnology,HarbinHeilongjiang150001,China)Abstract:Computationalmodelisestablishedforanalysisof3Dlasercladdingtemperaturefieldcausedbymovinggaussdistributingheatsource.Inthemodel,acalculationmethodofthethermalpropertiesofcompositematerialshasbeenintroducedinconsiderationoflatentheat,radiationandconvectionetc.TheprogrampreparedbytheADPLlan2guageattachedtothecommercialsoftwareANSYShashighprecision.Thelasercladdingprocesshasbeencalculatedandanalyzedbythemodelunderdifferentprocessingparameters,thesurfaceandsectionpsisothermandtemperaturegradshavebeenattained.Therefore,thepoolpsprofile,theshapeofheataffectedzoneandthestateoftheinterfacehavebeenforecasted,whichhasprovidedaguideforstudyontheformationandsolidificationmechanismoflasercladdingceramic2metalcompositecoatings,andthedesignoflasercladdingparameters.Keywords:lasercladding;ceramic2metalcompositecoatings;finiteelementmethod;temperaturefield:(1978),,,,:0451286402012:(50275031):2003212229,,,[1],[2],,,,,,,,,ANSYS,2,,,1111,,ANSYS3,,,,014mm,1mm1112,,,4220042971Fig11Themeshmodeloffiniteelement,,,,,:qs=(T1-T0)[4]ANSYS,,,,1[4]1Table1Convectioncoefficientsunderdifferenttemperatures/20100200300600750900100012001300150018002000/Wm-2K-16182030608412014720025135240050011345,-,,[5,6]J.Pow2ell[7],,,,,ANSYS,,,[3]:12=(1-)(1+)(1):1;2;,8%114,,,C3=Lf/T,Lf,T[8],2115,,[9]:q(r)=qme-Kr2(2),qm(Wmm-2),qm=KQ/;K(mm-2),1/4,Q(W),r(mm),,016,ANSYSADPL,,,,,,,01125s,[10]116ANSYS,,2,,,50245,20mm12mm5mm,2,015mmNi,1455,3000,(2000W)(6mm),5,22Table2Processingparametersofthenumericalsimulation12345/mms-148101418/s0.12500.06250.05000.03570.027852200429721125,2201625s33015s,AI:306135758717138691069115014321713199422762557,3,,,,,,22(a)(b)Fig12Thetemperaturefieldofprocess2duringlasercladding(a)surface(b)crosssection33(a)(b)Fig13Theisothermalsofprocess3duringlasercladding(a)surface(b)crosssection4,2bL1L24a1/4(mm-2),1,3000,212mm1400;18mm/s,2400,115mm1400,1,;45,2000,Ni,315mm310mm,,,,,4b,4,015mm,1500,,,,,4(a)(b)Fig14Thetemperaturedistributionofcoatingsunderdifferentscanningspeeds(a)surface(b)crosssection212,[11],62200429755,,,210106/m,,,[12],011106/m,CuMn,5(a)(b)Fig15Thetemperaturegradsofsamples(a)surface(b)crosssection2,,,,,,,k1,C3sC0;,,(),,,5,,,3,2,015mm2,1,,,6a;23,,,,,,6b3,,014mm318mm,45,,,5012mm,,,6c6(a)1(b)3(c)5Fig16Themicrostructureofcoatingsunderdifferentprocesses(a)surfaceofprocess1(b)crosssectionofprocess3(c)crosssectionofprocess54(1),,,,,,,,,,7220042971,2,2(11,100083;21,221008):WC/,,WC,,;:;;;:TU599;TG113.25:A:025426051(2004)0720028204HardnessBehaviorofParticleReinforcedMetalMatrixCompositesbyCentrifugalCastingFENGPei2zhong1,QIANGYing2huai2,WANGXiao2hong2(1.SchoolofMaterialsScienceandEngineering,UniversityofScienceandTechnologyBeijing,Beijing100083,China;2.SchoolofMaterialsScienceandEngineering,ChinaUniversityofMiningandTechnology,Xuzhou,Jiangsu221008,China)Abstract:ThesurfacecompositesmadeofsteelmatrixandWCparticleswerepreparedbycentrifugalcasting.Thehardnesschangeofcompositematerialswasstudied.TheresultshowedthatthecentrifugalcastingmadetheWCpar2ticlesappeargradientdistribution,thehardnessofcompositesdisplayedgraduallowerinward,andthetransitionzonewasstrengthened.Amathmodelofthehardnessofcompositeswasestablishedbyregressionanalysis.Keywords:centrifugalcasting;metalmatrixcomposites(MMCs);hardness;regressionanalysis:(1976.08),,,,,5:010282883316E2mail:fengroad@163.com:20042032121,,2060,,,(2),,2:[1]JehnmingLin.AsimpleModelofPowderCatchmentinCoaxialLaserCladding[J].Optics&LaserTechnology,1999,(31):2332238.[2],,.[J].,2001,12(2):1502153.[3],,.[J].,1997,18(2):58262.[4].[M].:,1958,11:26228.[5],.[M].:,1996.[6],,,.[M].:,1996.[7],.[M].:,1994:132.[8].[M].:,1998:203.[9].[M].:,1994,9:14215.[10]CarmignaniC,MaresR,ToselliG.TransientFiniteEle2mentAnalysisofDeepPenetrationLaserWeldingProcessinaSinglepassButt2WeldedThickSteelPlate[J].Com2put.MethodsAppl.Mech.Eng.,1999,(179):1972214.[11]GuoW,KarA.InterfacialInstabilityandMicrostructuralGrowthDuetoRapidSolidificationinLaserProcessing[J].Actamater,1998,46(10):348523490.[12],,,.CuMn[J].:,2001,21(2):126.822004297