机械外文翻译--我国渗透铸造技术的发展.doc

ThedevelopmentofcastingpenetrationtechnologyinourcountryInfiltrationcastingissolidifiedinthecastingprocesstoachievesurfacealloyingofaproductiontechnology,becauseofthedepthofalloying,andproductionprocessissimple,low-costadvantages,inmanyuniquesurfaceenhancementtechnology,moreandmorepeopleimportance.Thebasicideaistoallowliquidmetaltoinfiltratethroughtheporousalloycoating,thesiegeofalloyparticles,fluxandotheradditivesincommonunderthematerializedthroughaseriesofhigh-temperaturemetallurgicalreactionintheoriginallocationoftheformationofalloycoatinglayer,themodelThekeyisinsidethemetaltopenetratethecoating.AsaresultofinfiltrationofMCinterfaceaftertherapidexpansionofalloyingelementsconducivetothespreadoftheliquidmetalhasacertaindepthandthestabilityofthealloylayer.Thisnewprocessappliestochromium,boron,tungsten,etc.asthemainalloyingelementsinsteel,castironoftheanti-wear,heat-resistantalloylayertoobtaingoodresults.However,thetechnologystillexistsasfollows:(1)alloyingprocessgas,slag,etc.cannotbedischargedintime,inthealloylayergeneratedpores,inclusions,affectingthequalityofalloylayer,(2)theeffectofalloyingontheprocessmoresensitivetochangesinparameters,theequipmentmusthavegoodconditionsandstrictproductionprocessinordertobeinmassproductionthequalityofthesurfacealloyisstableandreliableproduct.Inresponsetotheseproblems,the20thcentury,sincethe90s,thedomesticmaterialinfiltrationcastingtechnologyworkerscarriedoutextensiveandin-depthresearch,andhaveachievedgoodresults,andinmining,metallurgyandotherfieldsshowthatabroadapplicationprospects.1ThechoiceofmaterialsInordertoobtainspecialpropertiesofcastalloysurfaceinfiltration,usuallyagoodchoiceofabrasionresistance,highhardnessoftheanti-wearalloyforinfiltrationcastingagents,metalmatrixcastironorsteelused.Kevinpermeabilitymaterialbetweenelementsofthematchingcoefficientofthermalexpansion,andwettingandphaseresponseaslowaspossibleisourfirstandforemosttheprincipleofselection.1.1castingagentdialysisoptions:Inordertoobtainhighhardnessoftheanti-wearalloylayer,alargenumberofstudiesusedbyWC(HV2400),Cr-Fe,B-Feinfiltrationcastingagent,etc.,butalsojoinedtheTi,Nb,Co,Niandotherelementstoimprovethepermeabilityalloycastingandotherperformance.Infiltrationcastingagentaddedcosolvent.Itsroleistopromotethealloymelttoformthefunctionofreducingatmosphere,toensuretherapidformationofalloylayer,densewithoutdefects,allmaterialspreparedinaccordancewithaspecificformoftechnology,alargenumberofstudieshaveproved:InordertoreducethelayerofcastingporosityandfoldersJavaflaw,shouldminimizetheamountofbinder.WCcanbedescribedasthelargestnumberofpeoplecurrentlyusingacastingagentpermeability,comparedwiththeironandsteelmaterials,WChashighhardnessandhighredhardness,thecompressivestrengthofWCatthesametime,thermalconductivityandYoungsmodulusratioofhighsteelmaterial24timesthesamehigh-speedsteelwithhighstrengthandhightoughness,WCowndecisionmanyadvantagesincuttingtools,wearpartsandhigh-speedrollingmilltheextensiveapplication.1.2MetalMatrixSelection:Inadditiontothemetalsubstrateshouldhavesufficientstrengthandtoughness,butmoreimportantly,istheWC,Cr-Fe,B-Fealloy,suchascastingagentsdialysisagoodwettabilityandacertaindegreeofsolubilityinordertoensuretheformationofinterfacialenergyfortheirongroupofthesolidsolutionmatrix,thatistosaysothatmetallurgicalbondinginterfacewastoenhancethebondstrength.Researchisoftenusedforcastironsteelalloyormetalmatrix.Castironthansteel,itslowmeltingpoint,goodliquidity,whichisconducivetoinfiltration,butwithCandtheimpurityelementsinhightemperatureundertheintensereaction,thusaffectingtheinterfacialbonding,Practiceprovedthat:castiron-basedinfiltrationresistanceofmaterialsusedtomakemorelow-stressabrasivewearofthewear-resistantconditionsweremoreappropriate,andtheoverallrequirementsforsomegoodcomprehensivemechanicalproperties,andaspecialperformanceoftheworksurface(suchascorrosionresistance,heatresistance,wearresistance)oftheworkpiece,thematrixmetalmustbecaststeel,inordertomeetthetoughpartsintheperformanceofthehardwarerequirementsofsteelcastingswithahighsolidificationtemperature,rapidsolidification,thecharacteristicsofpoorliquidityandhencetheformationofqualifiedcastalloylayerinfiltrationdifficult.Ifthemetalcoatingorcastingmoldwiththenegative-pressurevacuumsuction,totheformationof45mmdiffusionofalloyingelementsorthemotherliquortoinfiltrateintothesurfaceofalloysteelcasting-typelayer.XinjiangInstituteofTechnologydevelopedundertheconditionsinthegravitationalfield,throughthesuppressionofalloy粉膏fastermachines,areasonablechoiceofalloypowdercomposition,theuseofhotmoltensteelastrongroleinthesurfacelayerofsteelcastings78mmthicklayerofalloy,layerandbetterqualitycasting.2.InfiltrationcastingprocessInfiltrationcastingprocessstatusof2ispre-alloypowderwillbefixedinthemoldofaspecificlocationonthewall,throughthemethodofpouringacastingsurfacetoformawear-resistant,corrosionresistance,hightemperatureandotherspecialpropertiesofthesurface,thecurrentprocessesusedmainlyusesthefollowingtechniques:bycastingagentinfiltrationintotheformationofdifferentcoatingmethod,plasterblockmethod,castinganegativepermeability；bycastinggravityfieldcanbedividedintodifferentpouring,pouringhypergravityfield.3.domesticresearchandapplication20thcentury80s,TsinghuaUniversityandothervulnerablepeopleinthesouthandcastdialysiswerestudied.Themtohigh-chromiumwhiteiron-based,adifferentnumberofembeddedWCparticlesasapercolation-castmaterial.Andsurfacelayercastingmaterialsthatmatchtheselectionofwear-resistantsteelcastingmetal30NnSiTi,thesteelstrengthwithgoodtoughness,lowcontentofalloyingelements,thepricecheap,quenchingtemperaturethebasiclayerforthesurfaceofcastingrequirements.TheyusedthisprocessonthepermeabilityofhighchromiumwhitecastironcompositematerialimpactonthefanboardmillExperimentalresultsshowthatthewearresistanceofcompositematerialsthantheimpactofrawmaterialsZG50M2boardtoimprovethewearresistanceof28%.WCpercolationofthesurfacewearresistancecasthighchromiumwhitecastironsurfacelayerofthewearresistanceincreased7times.Literature1Thestudyalsoshowedthat:WCandagoodmetalwettingliquid,easytorestorethesurfaceoxides,thecasthasgoodpermeabilityproperties.WClayercanbeadjustedbecauseoftheirsize,distribution,highmicrohardness,ithasexcellentanti-wearperformance.InfiltrationcastingWC,ductileironmaterialsselected,high-manganesesteel,carbonsteelcanbesatisfiedwiththelayer,tofacilitatetheproductionandapplicationofresearchresultsguidemill,cementshotcreteliningofthedevelopmentofrotatingmachines,andachievedgoodresults.90stothe20thcentury,castdialysistechnologyresearchanddevelopmenthasbeenfurtherdeveloped.ShenyangInstituteofcastingductileironwithWCand40Crstrengthenedtoincrease3.5times.BeijingUniversityofScienceandTechnologyinthegraycastironingotmoldsurfaceboronizing,FuxinMiningInstituteinthesurfaceofcastductileironhammerandtitaniumvanadizing.Haveincreasedthelifeoftheworkpiece,LiaoningInstituteofMechanicalEngineeringTechnologyXuZhimingandotherschoosetoCr-Fe,Ti-Fe,V-Fe,Mo-Fealloy,suchascastironasapercolationagent.Atthesametimeaddingasmallamountofrareearthalloy,canhammertheballthefirstpartoftheformationofthesurfacelayerofinfiltrationcastingalloywhitecastironlayerandcontrollayerofwhitecastironalloycarbidemorphologyanddistribution.Ironsurfaceintheballwas4mmthickwhiteironalloylayerenhancedbytheabrasiveweartestsconfirmedthatthesurfaceofthewearresistanceofductileironis2.01timesNeedtospecificallypointoutthatsincethe20thcentury,sincethe90s,XinjiangInstituteofTechnologypermeabilityofCrcastauseful,valuablediscussion,inordertofurtherimprovethecastlayerthicknessandlayertoretainmoreofthealloyparticlesasahardqualitativephase,withaviewtoimprovethewearresistance,theybothexperimentalandproductionblocksinplaceoftheuseofalloyalloycoatingpaste.Chromizinglayerforthecastiron,castironmadebythefusionlayerCrpermeabilitylayer,brazinglayerandthesinteredlayerconstitutethethreedifferentregions,eachdistinctregionoftheformationmechanismofthenewtheory,thestudyofpeoplewithlesssteelcastinginfiltrationprocessalsocarriedoutresearchchromizingsteellayerformedbyfusion,sinteringlayerconsistingofanewtheory.Theestablishmentoftheprocessfactorsontheimpactofcastalloylayerpermeabilityofone-dimensionaldigitalmodel,andverifiedbytests.InadditiontothecastalloylayerpermeabilitycharacteristicsofCr-depthanalysisofthequalityofdialysisanditseffectscastasystematicstudyofthefactors.Theresultsoftheirresearchhasbeensuccessfullyusedforindustrialproduction,brick-makingmachineinthegraycastironmoldsurfaceCr,itsservicelifethantheoriginallifeofgraycastironmaterialisincreasedby810times.Inrecentyears,inordertoobtainthequalityofthecastlayerstability,theeliminationofslaglayerporosity,somescientificandtechnologicalworkerstoavarietyofnewtechnologycastinginfiltration.LeasingCo.,Ltd.ofChinaZhaoJianhuacastingcompaniescastinganegativepermeability.Kevindialysisasaresultofthisprocessdoesnotdependonthebinderalloyparticlesattachedtothemoldsurface,butbynegativepressureintheaboveadsorption,solid-castlayerandthequalityismuchhigherthanthetraditionalmethodofcastinginfiltration.Inadditiontheliterature6throughthevacuumofthetheoryofpercolationanalysisoftheimpactofnegativefactorscastinginfiltrationdepthandshadowlaw.WithWC,aluminaandnickelpackagesfordifferentparticlesizealuminaceramicparticles,heat-resi