翼类钛合金零件超塑成形_扩散连接关键工艺研究

南京航空航天大学硕士学位论文翼类钛合金零件超塑成形/扩散连接关键工艺研究姓名：王荣华申请学位级别：硕士专业：材料加工工程指导教师：陈明和20090101I/SPF/DBSPF/DBSPF/DBTC4/:MarcTC4-////IIABSTRACTInaerospaceindustry,thetraditionalmanufacturetechnologyforassemblingaerofoilpartoftitaniumalloywasusingriveting,bolting,weldingandotherconnectionforms,whichhassomedisadvantages,includinglargepartquantity,greatassemblydifficulty,poorreliability,andithasbroughtmanyproblemsforcurrentaircraftmanufacturing.Theappearanceofsuperplasticforminganddiffusionbondingtechnologyhaschangedthisconnectionforms,andithassomeadvantagesoverthetraditionalmanufacturetechnologiesinmanyaspects,suchasimprovingvehicleperformance,reducingcomponentweightandproducecostandsoon.Mostaerofoilpartsbelongtomultilayerstructureform.Inoversea,theSPF/DBtechnologyforaerofoilpartwasaresearchhotspotinaerospaceindustryforages,butindomestic,itisjustattheexperimentalstage,andhasnotgoneintothesubstantiveengineeringstage.Therefore,itisespeciallyimportanttodosomeresearchontheSPF/DBtechnologyformultilayerstructureofaerofoilpart.Inthisthesis,thoroughresearchontheSPFandSPF/DBtechnologyforaerofoilpartofTi-6Al-4Vwascarriedout,thesamplepartsoftwoandthreelayerstructurewerefabricatedsuccessfully,andthesolutionsofkeyprocesseswereputforward.Themaincontentsareasfollows:Firstly,basedonthetheoryofmetalsuperplasticforminganddiffusionbonding,andcombinedwithrelatedtheories,thenumericalsimulationofSPFfortwolayerandthreelayerstructureofTi-6Al-4Vtitaniumalloywererealized.Thedistributionofthickness,attaching-dieprocessandgroovewerepredicted.Meanwhile,pressure-timecontrolcurveundertheiso-strainratewasobtained.Thesecanprovidethereferencebasisforsubsequentexperiment.Secondly,Combinedwiththeresultsofthefiniteelementsimulation,designingcorrespondingdie,carryingoutexperimentsonSPFandSPF/DBofaerofoilpartsfortwolayerandthreelayerstructureoftitaniumalloy,andfabricatingsamplepartsofaerofoilstructure.Lastly,accordingtotheresultsofexperiment,researchesonthicknessdistribution,microstructureanddiffusionbondingrateweredone,andthesolutionsofkeyprocesses,suchasseal,intake,exhaust,stop-off,groove,formingenvironmentalprotectionandthicknessreduction,wereputforwardinthepaper.Meanwhile,suggestionsontheexperimentofgaspressingdiffusionbonding/superplasticformingprocessforthreelayerstructurewasgiven.Thesecanprovideacertainfoundationforsubsequentresearch.Keywords:Superplasticforming/diffusionbonding,finiteelementsimulation,titaniumalloy,aerofoilpart,keyprocess/VI1.1..............................................................41.2SPF/DB...........................................................51.3DB...............................................................62.1ASHBY-VERRALL...........................................142.2BALL-HUTCHISON........................................................142.3MUKHERJEE............................................................152.4GIFKINS..............................................................152.5-.......................................................162.6..........................................182.7.....................................................202.8....................................................213.1.............................................................223.2.................................................................223.3.................................................................233.4TC4.................................................243.5...........................................................253.6...............................................................254.1...................................................274.2...............................................294.3............................................304.4-..........................................304.5......................................................314.6.......................................................324.7...................................344.8.................................344.9......................................................354.10.................................................364.11-............................................375.1SPF/DB.............................................38VII5.2/.........................................395.3......................................................395.4.....................................................395.5....................................................405.6......................................................415.7............................................................425.8....................................................435.9..................................................435.10.........................................445.11....................................................445.12...............................................455.13/.............................................455.14/................................456.11/4..................................................476.2....................................................476.3P-T.........