关于焊接方面的英文文献

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1、ELSEVIERJournalofMaterialsProcessingTechnology180(2006)216-220JournalofMaterialsProcessingTechnologywvvvv.e]sevier.com/locaie-^iurialprolecStudiesonsofteningofheat-affectedzoneofpulsed-currentGMAweldedA1-Zn—MgalloyGaofengFuCorrespondingauthor.Tel.:+8624:fax:+8624.E-mailadd

2、ress:f@126.com(G.Fu).,FuquanTian,HongWangSchoolofMaterialsandMetallurgy,NortheasternUniversity,Shenyang,ChinaReceived15December2005;receivedinrevisedform9June2006;accepted12June2006AbstractStudiesonthesofteningbehaviorofthe7005alloybymeansofrealweldingexperimentsandheat-af

3、fectedzone(HAZ)simulationhavebeenconducted.SofteningintheHAZisfoundtooccuraboveapeaktemperatureofabout200°C.Itwasfoundthattheheat-affectedzoneofthealloyscanbedividedintotwosub-zonesaccordingtotheirdifferentmechanismofsoftening:thedissolutionzoneandtheoverageingzone.Thediss

4、olutionzoneischaracterisedbydissolutionofprecipitatesandcoversthepeaktemperaturerangeabove380°C.Theoverageingzoneischaracterisedbygrowthofprecipitatesandcoversthepeaktemperaturerangebetween230and380°C.Thehardnessintheheat-affectedzonecanberecoveredbypost-weldhealtreatment,

5、especiallyinthedissolutionzone.Artificialageingismoreeffectivethannaturalageingconsideringtherecoveryofthehardness.©2006ElsevierB.V.Allrightsreserved.Keywords:Aluminumalloys;Heat-affectedzone:Softening;Welding:Thermalsimulation1.IntroductionTheAl-Zn-Mgalloyhaswideacceptanc

6、einfabricationoflightweightstructuresrequiringahighstrength-to-weightratio,suchasstoragetanksofspacerockets,transportablebridgegirdersandrailwaytransportsystems[1-3].WithintheAl-Zn-Mgalloysystemthe7005alloyisamedium-strengthandweldablealloywhichcontainsmainly4.5%Zn,1.4%Mg

7、andsomeamountsofmanganese.TheprecipitationsequenceusuallyproposedforalloyswithsimilarZnandMgcontentstothoseofthe7005alloyis[4]:or-supersaturatedsolidsolution(a-SSS),sphericalGuinicr-Prcston(GP)zones,thetransitionphasephase)andtheintermetalliccompound("Hphase).a-SSSisretai

8、nedafterquenchingtoroomtemperature(RT).ThefirststageofdecompositionoccursbyagingatRTfora