6000系铝合金汽车板预时效及组织性能

152Vol.15No.2TheChineseJournalofNonferrousMetals20052Feb.2005:10040609(2005)0202700760001,2,1,1,1,1(1.,110004;2.,250100):,MgSiMn6000,:Mn,,,Si,MgSiMn,,(170510min),,:6000;;;;:TG146.2:APre2agingandmicrostructurespropertieson6000seriesaluminiumalloysforautomotivebodysheetsLIUHong1,2,SONGWen2ju1,ZHAOGang,LIUChun2ming1,ZUO2Liang1(1.SchoolofMaterialsandMetallurgy,NortheasternUniversity,Shenyang110004,China;2.SchoolofMechanicalandElectricalEngineering,ShandongInstituteofLightIndustry,Jinan250100,China)Abstract:Throughtransmissionelectronmicroscope,scanelectronmicroscope,energyspectrum,metallographanalysisandhardness,tensileandformabilitytests,theeffectsofMg,SiandMncontentsvariationonthemicrostructures,tensilepropertiesandformabilityofafew6000seriesaluminiumalloysforautomobilebodysheetswereinvestigated,thesuitablepre2agingtreatmenttechnologywasalsoresearched.Theresultsshowthatthenumberofinsolubleconstituentsanddisper2soidparticlesinalloysincreasewithincreaseofMncontent,theformerisdetrimentalforthespecificelongationofalloys,andthelatterimpedesrecrystallizationduringsolutiontreatment.ForSialloysexcess,thestrengthisenhanced,andthespecificelongation,strainhardeningexponent,plasticstrainratioandErichsenvalue,aredecreasedwithMgandSimassratioandMncontentincreasing.Pre2agingofalloysheetsimmediatelyaftersolutiontreatmentandquenchingcannotonlyreducethehardnessofsubsequentlynaturalaging,butalsoenhancethehardeningeffectoffollowingartificialaging,whichisadvantagetostamppingformationandhardenabilityincreasingduringpaintbakecycle.Thesuitablepre2agingtreatmentsystemistheshort2timepre2agingat170for510minimmediatelyaftersolutiontreatment.Keywords:6000seriesaluminiumalloys;automotivebodysheets;pre2aging;hardness;paintbakehardenability:(2002AA331050);(0208);:20040809;:20041203:(1959),,,.:,;:02483681685;E2mail:[e-mail],,,6000[14]T46000,170,(30min),,,[57],Al2Mg2Si,[812],[1315]6000,,600019919%Al2915SiAl29MnAl24CrAl23Ti(,%),,220mm120mm20mm,,4705h54016h,430415mm,4101h,112mmGB/T50271999GB/T50281999,nr04590,1215mm50mm,1045mm(IE)20mm20mm60mm60mm112mm0107mmd3mm,30%()+70%(),-25-2054030minnrIET4(),3:1)T4,8030min,170;2)T4P(170(5,10,20,30min),2);3)T4P8030min,17030min,,1706h17030min,CMT5105SANSd8mmHVA10A,49NLEICAMPS30PhilipsEM400TSSX550(SEM)DX4(EDS)22.111113MgSi,MgCuMn,1112Si,13Mg1Table1Chemicalcompositionsofalloys(massfraction,%)SampleNo.SiMgCuMnFeZnCrTiAl111.490.750.660.310.280.200.110.15Bal.121.221.290.480.690.300.200.11Bal.130.801.800.300.900.300.200.11Bal.2.2T4n15r15IE2,11122T4Table2MechanicalpropertiesandformablityofalloysinT4stateSampleNo.b/MPa012/MPa/%IEn15r15113421419517261031230127018112352181961823163103012501801329715147152015317601260184172152,:6000b0.2,n15IESi(1112),MgSiMn,Mg(13),b0.2,n15r15IE2.31,11132111213,Al(FeMnCr)SiMg2SiAl(FeMnCr)Si1Fig.1Microstructuresofalloysafterhomogenizingtreatment(a)Alloy11;(b)Alloy12;(c)Alloy132Fig.2MorphologiesandEDSpatternsofnon2solventconstituentsafterhomogenizingtreatment(a)Morphologyofalloy11;(b)Morphologyofalloy13;(c),(d)EDSpatternsofalloys11and1327220052AlFeSi[16],MnMn,Mn,MnFe[16],Fe,MnCrMnSi,MgSi,Mg2SiMg,12Mg2Si3Mn,,,,4,(540),,(Mn13)Si(1112),MgSiT4Mg2SiGP,MgSi,Al(FeMnCr)Si,Mg2Si,,Mg(13),Mg,,15%nr,,,13n15r15IE,MgSiMn,6000,,2.431706hTEMFig.3TEMimagesofalloysagingat170for6haftersolutiontreatment(a)Alloy11;(b)Alloy12;(c)Alloy13417030minFig.4Microstructuresofalloysagingat170for30minaftersolutiontreatment(a)Alloy12;(b)Alloy13372152,:60002.4.1T4T4,8030min,170,1705,170()30min,T4,T45T4170Fig.5Hardnessvariationsofalloysagingat170fordifferenttimeinT4condition2.4.26170T4P,0T4,1705minT4PT4,,T4P10min,T4PT46T4PFig.6Effectsofpre2agingtimeonhardnessofalloysbyT4Ptreatment,10min,T4PT47,,,T4PT4,()170,,,,,T4P,,170(),,(30min),,T4PT4P,,,T4PT4,,17010min,10min,17010min31)Mn,Al2Mg2Si2Cu,,,2)Si,MgSiMn,Al2Mg2Si2Cu,n15r15IE3)T4600017030min,T44),T4P170510min472200527Fig.7Effectsofpre2agingtimeonpaintbakehardenabilityofalloys(a)5min;(b)10min;(c)20min;(d)30minREFERENCES[1]BurgerGB,GuptaAK,JeffreyPW,etal.Microstruc2turalcontrolofaluminumsheetusedinautomotiveappli2cations[J].MaterialCharacterization,1995,35:2339.[2]BottemaJ,LahayeC,BaartmanR,etal.Recentdevel2opmentsinAA6016aluminiumtypebodysheetproduct[J].SAETransactionJMaterandManufSections,1998,107:900907.[3]KamatRG,ButlerJF,MurthaJr,etal.Alloy60222T429forautomotivesheetapplications[J].MaterialsSci2enceForum,2002,396402:15911596.[4]WeatherlyGC,PerovicA,MukhopadhyayNK,etal.TheprecipitationoftheQphaseinanAA6111alloy[J].MetallurgicalandMaterialsTransactionsA,2001,32A(4):213218.[5]KleinerS,HenkelC,SchulzP,etal.Paintbakere2sponseofaluminiumalloy6016[J].Aluminium,2001,77(3):185189.[6]MiaoWF,LaughlinDE.Precipitationhardeninginalu2minumalloy6022[J].ScrriptaMateriala,1999,40(7):873878.[7],.()[J].,1978,28(1):4756.LINZhao2qi,SUNGui2jing.Non2uniformityofmicro2structureandthestep2agingtheoryofaluminiumalloys(Upperportion)[J].LightMetal,1978,28(1):4756.[8]ZhenL,KangSB.EffectofnaturalagingandpreagingonsubsequentprecipitationprocessofanAl2Mg2Sialloyswithhighexcesssilicon[J].MaterSci