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JOURNALOFSHANGHAIUNIVERSITYENGLISHEDITION,2005,95455457ARTICLEID10072641720050520455203ABSTRACTOFDOCTORALDISSERTATIONCOMPUTERAIDEDALLOYDESIGNOFHIGHPERFORMANCEPREHARDENEDMOLDSTEELFORPLASTICPHDCANDIDATEHEYAN2LIN何燕霖ADVISORPROFLILIN李麟SCHOOLOFMATERIALSSCIENCEANDENGINEERING,SHANGHAIUNIVERSITY,SHANGHAI200072,PRCHINARECEIVEDJUN15,2005PROJECTSUPPORTEDBYKEYPROJECTOFSHANGHAIMUNICIPALCOMMIS2SIONOFSCIENCEANDTECHNOLOGYGRANTNO015211010HEYAN2LIN,PHDCANDIDATE,E2MAILYLHEMAILSHUEDUCN;LILIN,PHD,PROF,E2MAILLILINGSH163NETKEYWORDSPREHARDENEDMOLDSTEELFORPLASTIC,THERMO2CALCDICTRASOFTWAREPACKAGE,MACHINABILITY,HEATTREATMENTTECHNOLOGY,FREECUTTINGPHASEPREHARDENEDMOLDSTEELFORPLASTICISTHEPRIMARYFORMANUFACTURINGHIGHQUALITYPLASTICMOLDWITHTHERAPIDDEVELOPMENTOFMOLDINDUSTRYINOURCOUNTRY,THISKINDOFSTEELEXHIBITSEXTENSIVEAPPLICATIONPROSPECTHOW2EVER,BECAUSEOFPROPERTYDEFICIENCIESOFDOMESTICPRO2DUCEDSTEEL,IMPORTSTEELSHOLDMAJORPARTOFMARKETSHARE\1,2\INORDERTOCHANGETHESITUATION,USING“METHODOFACCELERATEDMATURATIONOFMATERIALS”INTHISARTICLE,THECOMPOSITIONANDTECHNOLOGYOFPREHARD2ENEDMOLDSTEELFORPLASTICAREOPTIMIZEDANDDESIGNEDBYTHERMO2CALCDICTRATHERMODYNAMICSOFTWAREPACKAGE\3\ONTHESTRONGBACKGROUNDOFINDUSTRIALAP2PLICATION,THEPROPERTYOFDOMESTICPRODUCEDSTEELISEFFECTIVELYIMPROVEDATTHEPREMISEOFNOINCREMENTALCOST,WHICHREACHESTOTHEPERFORMANCELEVELOFTHESAMEKINDOFHIGHQUALITYSTEELINTHEWORLD,EG,ASSAB718STEELINADDITION,ONTHEBASISOFRESEARCHRESULTSMENTIONEDABOVE,THENEWKINDOFFREEMACHIN2ABILITYSTEELWITHHIGHPERFORMANCEANDBETTERAPPLICA2TIONISDEVELOPEDWITHTHECOMPAREDANDSTUDIEDINTHISARTICLE,ITISSHOWNTHATTHEMECHANICALPROPERTYATROOMTEMPERA2TUREBETWEENIMPORTPREHARDENEDMOLDSTEELFORPLASTICWITHLARGESECTIONANDDOMESTICPRODUCEDSTEELISSIMI2LARCOMBINEDWITHMICROSCOPEANDSEMEDXANALY2SES,ITISSHOWNTHATTHECONTENTOFOXIDEINCLUSIONINDOMESTICPRODUCEDSTEELISHIGHERANDMAINLYCOM2POSEDOFALUMINUMOXIDE,BUTTHENON2METALLICINCLU2SIONINASSAB718STEELISMAINLYCOMPOSEDOFSOFTPHASESULPHIDEINCLUSIONINTHEFORMOFMANGANESESUL2PHIDEWITHALUMINUMOXIDEATTHECORETHEFLANKWEARAMOUNT,CUTTINGFORCEANDTHESURFACEROUGHNESSOFMACHININGSAMPLESARECOMPREHENSIVELYTESTEDBYTURN2INGTESTATLOWCUTTINGSPEEDANDPOLISHINGTEST,ITISSHOWNTHATTHEMAINPERFORMANCEDIFFERENCEBETWEENDOMESTICPRODUCEDSTEELANDASSAB718STEELISMA2CHINABILITYBECAUSETHEKEYTOAFFECTMACHINABILITYOFSTEELISNON2METALLICINCLUSION,MACHINABILITYOFSTEELCANBEIMPROVEDBYTHEDEFORMATIONANDDECREASINGABRASIONEFFECTOFSULPHIDEDURINGMACHINING\4,5\THEMACHINABILITYOFDOMESTICPRODUCEDSTEELISMARKEDLYDECREASEDBYSEVEREABRASIONEFFECTOFALUMINUMOXIDEWITHHIGHHARDNESSANDHIGHMELTINGPOINTONTHECAR2BIDETOOLSOITISTHEMAINMEANSTOIMPROVESTEEL’SPERFORMANCETHATREMOVEORMODIFYTHEOXIDEINCLUSIONINSTEELSLAGDATABASEBASEDONGAYEMODELANDTHERMODY2NAMICCOMPUTATIONSYSTEMBASEDONCALPHADTECH2NIQUEINTHERMO2CALCDICTRASOFTWAREPACKAGEAREPOWERFULTOOLSFORCOMPUTATIONEQUILIBRIUMRELATIONOFMULTICOMPONENTANDMULTIPHASESYSTEMDURINGSTEEL2MAKINGPROCESS\6,7\ACCORDINGTOCOMPUTATIONALRE2SULTS,THEPRECIPITATIONPROCESSANDITSINFLUENCINGFAC2TORSOFNON2METALLICINCLUSIONAREPREDICTEDITISSHOWNTHATTHEIRRATIONALCOMPOSITIONRATIOISTHEMAINFACTORTORESULTINHIGHERCONTENTOFALUMINUMOXIDEIN2CLUSIONINDOMESTICPRODUCEDSTEELBYTHEESTIMATIONOFINCLUSIONTYPEPRECIPITATEDINSTEELTHENTHECOMPOSI2TIONOFTHESTEELISOPTIMIZED,ITISSHOWNTHATTHEWEIGHTPERCENTOFALLOYELEMENTSCARBON,MANGANESE,SILICON,CHROMIUM,NICKELANDMOLYBDENUMAREATTHERANGEOF036042WT,135145WT,0203WT,1820WT,0810WTAND0204WTRESPECTIVELYTHEEXPERIMENTALRESULTSSHOWTHATTHECONTENTOFALUMINUMOXIDEINCLUSIONISMARK2EDLYREDUCEDANDMAINLYSUBSTITUTEDBYMNSWITHMI2NUSCULEALUMINUMOXIDEPARTICLEATTHECORE,THEMA2CHINABILITYOFDOMESTICPRODUCEDSTEELAFTERCOMPOSI2TIONREGULATIONISMARKEDLYIMPROVEDDUETOTHECLOSERELATIONSHIPBETWEENPHASETRANS2FORMATIONANDHEATTREATMENTTECHNOLOGYESTABLISH2MENT,THEMAINTYPEOFCARBIDEINPREHARDENEDMOLDSTEELFORPLASTICISM7C3TYPEBYTEMANALYSESANDCOMPUTEDRESULTSTHENTHEEFFECTOFTEMPERATUREANDALLOYCOMPOSITIONONTHEDISSOLUTIONOFM7C3TYPECAR2BIDEINSTEELISSIMULATEDBY“CELL”MODELINDICTRAPROGRAM\8210\ITISSHOWNTHATGENERALLYTHEDISSOLUTIONCONTENTSOFM7C3TYPECARBIDEAREINCREASEDWITHEN2HANCEDHEATINGTEMPERATUREANDPROLONGEDKEEPINGTEMPERATURETIME,THERELATIONSHIPBETWEENDISSOLUTIONCONTENTOFM7C3TYPECARBIDEANDTIMEATTHETEMPERA2TUREOF1183K910℃ISCLOSETOTHATATTHETEMPERA2TUREOF1203K930℃,ASSHOWNINFIG1FIG1RELATIONSHIPBETWEENM7C3CARBIDECONTENTANDTIMEUNDERDIFFERENTKELVIN’STEMPERATUREALLOYELEMENTSCR、MN、MOAFFECTTHEDISSOLUTIONOFM7C3TYPECARBIDE,ASSHOWNINFIG2ACCORDINGTOSIMULATEDRESULTS,THESEGREGATIONOFELEMENTSINLARGEMODULEISBASICALLYELIMINATEDBYHIGHTEMPERATUREHO2MOGENIZINGTREATMENTBEFOREFORGING,THATISDONEBYKEEPING10HOURSATTHETEMPERATUREOF120010℃,THUSSURFACEROUGHNESSOFMACHININGSTEELSAMPLEISIMPROVEDINADDITION,THECRACKINGOFMODULEWITHSMALLTHICKNESSRESULTINGFROMQUENCHINGISAVOIDEDBY910℃NORMALIZING,THEMICROSTRUCTUREANDPROPERTYOFTHESTEELARENOTBASICALLYAFFECTEDFIG2RELATIONSHIPBETWEENM7C3CARBIDEAMOUNTANDTIMEINSTEELSWITHDIFFERENTCOMPOSITI2ONSATTHETEMPERATUREOF1183KTHEPERFORMANCEOFDOMESTICPRODUCEDSTEELWITHLARGESECTIONAFTERCOMPOSITIONREGULATIONANDHOMOGE2NIZATIONTREATMENTATHIGHTEMPERATUREBEFOREFORGING,INCLUDINGMACHINABILITY,POLISHINGPROPERTIESANDANTI2CORROSIONPERFORMANCE,REACHTOTHELEVELOFASSAB718STEELANDITCANBEPRODUCEDINMASSITISHELPFULTOIMPROVETHEMACHINABILITYOFSTEELWITHADDITIONOFFREECUTTINGELEMENTSSUCHASSULPHUR,CALCIUM,ETC\11,12\BUTPRECIPITATIONOFHARMFULNON2METALLICINCLUSION,SUCHASCALCIUMALUMINATESANDCAL2CIUMSULPHIDE,CANBEAVOIDEDONLYBYREGULATIONTHECONTENTTHEEFFECTOFELEMENTSS,CAWITHDIFFERENTCONTENTSONTHEPRECIPITATIONOFNON2METALLICINCLUSIONISCOMPUTEDBYTHERMO2CALCSOFTWAREPACKAGE,ITISSHOWNTHATPERFECTFREECUTTINGPHASECANFORMINSTEELATTHEPROPERCOMPOSITIONRANGE,SUCHASGLASSYOXIDEINCLUSION2CAOAL2O3SIO2THATISC2ASFREEMA2CHINABILITYPREHARDENEDMOLDSTEELFORPLASTICWITHMODIFIEDCOMPOSITIONISTENTATIVELYPRODUCEDCOM2BINEDWITHSEMEDXANALYSE,ITISSHOWNTHATFREECUTTINGPHASEC2ASCANBEOBTAINEDBYADDITION2040PPMCALCIUMAND002WTSULPHUR,BUTC2ASISNOTEASYTOBEOBTAINEDIFTHECONTENTOFSULPHURINCREASEDTO004WT,WHICHISAGREEWITHTHEPREDICTIONCOMPAREDWITHCUTTINGATLOWSPEED,ITISSHOWNTHATATHIGHCUTTINGSPEED,THEDAMAGEOFTOOLISHEAVYANDTOOLLIFEISSHORT,BUTTHECUTTINGFORCEBECOMESSMALLANDTHESURFACEROUGHNESSOFMACHININGSURFACE654JOURNALOFSHANGHAIUNIVERSITYISALSOIMPROVEDTHEEXISTENCEOFSOFTPHASESULPHIDERESULTSINBETTERPROPERTIESOFSTEELATLOWCUTTINGSPEEDCONDITION,BUTATHIGHCUTTINGSPEEDCONDITION,ONLYTHEGLASSYOXIDEC2ASISTESTIFIEDTOFORMPROTECTIVELAYERATTHESURFACEOFTOOL,THENTHEWEAROFTOOLISEF2FECTIVELYINHIBITEDANDTHEMACHINABILITYOFSTEELISIM2PROVEDINADDITION,THEFREEMACHINABILITYEFFECTOFSULPHIDEPHASECANBEIMPROVEDBYADDITIONOFCALCIUMANDBISMUTHBECAUSEOFCHANGINGSULPHIDE’SSHAPEANDINCREASINGTHESTICKSTRENGTHTHEDUCTILITYANDISOTRO2PYOFSTEELDECREASEDBECAUSEOFTHEDEFORMATIONOFSOFTPHASESULPHIDE,BUTTHEMODIFIEDEFFECTOFCALCIUMONMNSCANDECREASETHEDISADVANTAGEWITHTHECOM2PREHENSIVEASSESSMENTOFMECHANICALPROPERTIESANDMACHINABILITY,THECOMPLEXADDITIONOFS2CA2BIWITHSMALLCONTENTISAACCESSIBLEPROJECTFORMANUFACTURINGFREEMACHIABILITYPREHARDENEDMOLDSTEELFORPLASTICREFERENCES\1\GANYONG,CHENZAI2ZHI,ZHAOXIAO2CUNSTATUSOFDIESTEELDEVELOPMENTINCHINAANDCOUNTERMEASUREFORTHECOMINGNEWCENTURY\A\,PROCEEDINGOFANINTERNATIONALCONFERENCEONTOOLSSTEELFORDIESANDMOLDS\C\SHANGHAI,1998,4249\2\GEHRICKEB,SCHRUFFITRENDSINPLASTICMOULDSTEELAP2PLICATIONS\A\PROCEEDINGSOFTHE5THINTERNATIONALCON2FERENCEONTOOLING\C\AUSTRIA,1999,8390\3\ANDERSSONJ2O,HELANDERT,HOGLUNDL,ETALTHERMO2CALCDICTRA,COMPUTATIONALTOOLSFORMATERIALSSCIENCE\J\CALPHAD,2002,262273312\4\SUBRAMANIANSV,GEKONDEHO,ZHANGX,ETALINCLU2SIONENGINEERINGOFSTEELSFORHIGHSPEEDMACHINING\J\CIMBULLETIN,1998,4107114\5\YAGUCHIHEFFECTOFMNSINCLUSIONSIZEONMACHINABILITYOFLOW2CARBONLEADED,RESULFURIZEDFREE2MACHININGSTEEL\J\JAPPLIEDMETALWORKING,1986,43214225\6\SUNDMANB,JANSSONB,ANDERSSONJ2OTHETHERMO2CALCDATABASESYSTEM\J\CALPHAD,1985,9153190\7\GAYEH,GATELLIERCSLAGSANDINCLUSIONSCONTROLINSEC2ONDARYSTEELMAKING\A\,PROCEEDINGSOFTHETHIRDINTER2NATIONALCONFERENCEONCLEANSTEELORGANIZEDBYTHEIN2STITUTEOFMETALSANDTHEHUNGARIANMININGANDMETAL2LURGICALSOCIETY,HUNGARY,1986,6137147\8\BORGENSTAMA,ENGSTROM,HOGLUNDL,ETALDICTRA,ATOOLFORSIMULATIONOFDIFFUSIONALTRANSFORMATIONINALLOYS\J\JPHASEEQUILIBRIA,2000,213269280\9\LIUZI2KUI,HOGLUNDL,JOSSONB,ETALANEXPERIMENTALANDTHEORETICALOFCEMENTITEDISSOLUTIONINANFE2CR2CAL2LOY\J\METALLURGICALTRANSACTIONSA,1991,22A17451752\10\BJARBOA,HATTESTRANDMCOMPLEXCARBIDEGROWTH,DIS2SOLUTION,ANDCOARSENINGINAMODIFIED12PCTCHROMIUMSTEELANEXPERIMENTALANDTHEORETICALSTUDY\J\METALLUR2GICALANDMATERIALSTRANSACTIONSA,2001,32A1927\11\SEKERU,CIFTCII,HASIRCIHTHEEFFECTOFALLOYINGELE2MENTSONSURFACEROUGHNESSANDCUTTINGFORCESDURINGMA2CHININGOFDUCTILEIRON\J\MATERIALSANDDESIGN,2003,244751\12\BLAISC,L′ESPRANCEG,LEHUYHDEVELOPMENTOFANIN2GRATEDMETHODFORFULLYCHARACTERIZINGMULTIPHASEINCLU2SIONSANDITSAPPLICATIONTOCALCIUM2TREATEDSTEELS\J\MATERIALSCHARACTERIZATION,1997,382537EDITORYAOYUE2YUAN754VOL9NO5OCT2005HEYLCOMPUTERAIDEDALLOYDESIGNOFHIGHPERFORMANCEPREHARDENEDMOLD
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