GH4169合金惯性摩擦焊工艺及有限元数值模拟研究

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1、西北工业大学硕士学位论文GH4169合金惯性摩擦焊工艺及有限元数值模拟研究姓名：王锴申请学位级别：硕士专业：材料加工工程指导教师：刘金合20070301塑!!三些查兰竺圭耋堡彗吝ABSTRACTInertiafrictionwelding(IFW)isanadvancedsolidstatejoiningprocess，whichhasthecharactersofexcellentefficiencyandenergy-saving．Ithasbeenprettyextensivelyusedinmanyindustryfields，s

2、uchasautomobile、aerospace、automobileandenergy,asaresultofthefeaturesoflessprocessparameters、highautomation、steadyqualityofweldingjointsandsoon．Conventionalinertiafrictionweldingprocessusuallyincludesbiginertia，lowrotationalspeedandpowerfulaxialpressure，underconsiderationf

3、orweldingautomationandmakingweldinglinesteadyexcellentperformanceandreappearance．Intheseconditions，itiseasytofindoflowertemperature—peakinfrictioninterface，easilyinducingheataffectedzone(HAZ)extending，hardlycontrollingjointqualitybecauseofhugebraketorque．Inordertoavoidthe

4、sedefects，IFWofGH4169alloywithlittleinertia，highrotationalspeedandtow-rankaxialpressurehasbeeninvestigatedinpresentdissertation．Ⅵmenforging．thephenomenonoftransientrisingofinterfacetemperatureissoexplicitthatflashappearsineachprocess．Accordingtomierostructureanalysisofwel

5、ds，thejointshavesymmetrytransitionofgrainswhicharefinerthanbasicmaterial’s，nodefectsofun-welded，splashcracks，tear-flawset；accordingtomeasuretemperaturesofjointsinweldingprocess，withthesameinputenergythehi曲errotationalspeedis，thehighertemperaturepeakofinterfaceappears，thel

6、essgradsofaxialtemperatureare，themorenalTOWHAZis：thepowerforgingpressureis，theclearerflashestakeup，theshorterthetimeofinstantincreasingofinterfacetemperatureundergoes，thehighpeaktemperatureininterfacearrives．Onthebaseoftheseresults，thispaperstatesweldsformingmechanism，com

7、paringperformanceofweldlinesintheconditionofuppertowcriterions，andsummarizingseveralfamiliardetectsofIFW．Meanwhile，referringtofeaturesofIFWundertow—rankpressurecriterion，combiningwithlargeformingthermo·-elastic--plastictheoreticsinmetalplasticityformation，vinualworkprinci

8、pleandtribologyrules，atow-dimensionaxi-symmetricthermo-mechanicalcoupledfiniteelementmodelwasest