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ID:32372534
大小:8.15 MB
页数:73页
时间:2019-02-03
《znal合金管的连续挤压与组织与性能研究》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、万方数据StudyonMicrostructuresandPropertiesofZn·AlAUoyTubesbyContinuousExtrusionAbstract:ThepresentreseaLrchissupponedbyHunallProVinceScienceandTecllllologyP1anProject(2012Gk4012)fortllethemeofreplacingc叩perwimzinc.AprocedureincludingtWo—st印continuousexmJsionforZn—Alalloytube
2、sisobtained妇oughCONFOI之Mcontinuousextmsionprocessexperiments.MoreoVer,theweldingmechanismduringcontinuousextl。usion,theagingbehaViorinseⅣiceconditions,andt11eeffectofstabilizingheattreatment((350oC,30min,如mace—cooling)+(1000C,l2h,anc001ing))wereanalyzedaJldinVestigated.Am
3、ethodoftwo—stepcontinuousextn】sionisproposedforthefirSttime,andZn—Alalloytubesoftwosizes((p12.5×1mmand(P15.5×1.5mm)aresuccess如1lypreparedthroughstI-engmenedwelding.TheresultsindicatethatZn-Alalloytubesbycontinuousextmsionexhibithighyieldrate(>90%),goodweldingqualit)rwitht
4、heweldseamwidthof2.48¨mandsuperiormechanicalproperties(6庄320Ⅳ咿a,6>l9.5%).ThetensilestrengthofextmdedtubesismorethanthatofsinlplebraussinsoRstate.TheextmdedZn—Ala110ytubesaremainlymadeupofT1phase,0【phaseandnon—equilibriumpphaseinmicros仃uctures.Afterstabilizingheatt1.eatmen
5、t,theamountof0【phasedecreases,whilethecontemofO【+T11amellarsmlctureincreases.ItisbenefittoimproVetheperfomancestabili锣o:E.Zn-Alalloytubes.Basedoncre印tests,itispointedoutthecreepmechanismsofexperimentala110ysaredislocationglidemech砌smandgrainboullda叫slidingmechanismunderte
6、nsileconditionsatroomtemperature.Besides,theheat-treatedZn-Alalloytubesshowbettercre印resistancetllallt11eas—extrudedalloytubes,andthedenectionunderthebendingstressof20Ⅳ中afor48hisreducedby40%aRerstabiljzingheattreatment.AccordiIlgtot11eanalysisofweldseams,durings01id—state
7、weldingofcontinuousextrudedZn—Alalloytubes,Al-richaphaSegathersinweldseamsowingtothedifferentdi伍Jsioncoef![icientofelementZnandA1.Stabilizingheattreatmentc锄promotethedif如sionandll万方数据reo唱anizationofelementsbominweldseamandm撕x,soastoreachtheequilibriumstateinmicrostmcture,
8、、Ⅳhichcallweakenmeharmfule腩ctsofweldseams.Themiddlepanof砒esdon’tcrackalongtheweldse锄sinn撕ngtests
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