2024铝合金的熔铸与形变热处理工艺分析

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1、AbstractAI—Cu．Mgaluminumalloyshayeexcellentpropertiessuchaslowdensity，highspecificmodulus，highstrengthtoweightratioandmechanicalworkingproperties，whichhavethewidespreadapplicationvalueandprospectinaerospace，defenseandotherareas．InordertoimprovetheperformanceofA1一Cu—Mg

2、aluminumalloys，the2024aluminumalloywaspreparedbyvacuuminductionmeltingandcopperwater—cooledmouldcastinginthisthesis．Comparedwiththeconventionalcasting，vacuuminductionmeltingcastingcanimprovethequalityofthemelt，purifythemeltsandeliminateblowholedefect．Copperwater．coole

3、dmouldcastingcanrefinegrainsizeandincreasethenumberofequiaxialcrystal．Themeangrainsizedecreasesfrom1259mto289m．Themicrostructureofalloywasimprovedtosomegreatextent．Theeffectsofvacuuminductionmeltingandcopperwater-cooledmouldcastingparametersonthemicrostructureandprope

4、rtiesof2024alloyswerestudied．Theresultsrevealthatthegrainsize，secondarydendritearmspacinganddendriteinprimary口(A1)weresignificantlyrefinedwiththecoolingrateincreasing．Themeltstiringincruciblewasstrengthenedwhenincreasingthepowerconsumptionandthemicrostructureofalloywa

5、simprovedwhencastingtemperatureincreasedto810。C．Themeangrainsizewas289m．Afterthethermomechanicaltreatment，thedislocationsinalloyincreasedanduniformlydistributed．Thereweresubstructuresandprecipitationinfinegrains，SOthemechanicalpropertyofalloywasimproved．Theeffectsofth

6、ermo．mechanicaltreatmentparametersonthemicrostructureandpropertiesofthealloyspreparedbyvacuuminductionmeltingandcopperwater．．cooledmouldcastingandconventionalcastingwerestudied．Theresultsrevealthat100。C／6hpresagedtreatmentcouldpreparemorenucleationcoresforthepeakagedt

7、reatmentandavoidtheheterogeneousprecipitationofS7phase．Thealloycouldobtainbetterworkhardeningandprecipitationstrengtheningwhenthewarmrolledprocesswas190。C／30％．Theprecipitationweresmallandhomogeneous，andmoremicro—substructureremainedwhenthesheetswerepeakagedat150。C．The

8、ultimatetensilestrengthofconventionalcastingalloysafterthermo-mechanicaltreatmentincreasedfrom450MPato535MPa．Alsocomparedwit