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1、銅陵學(xué)院期末論文InfluenceofHotPressFormingTechniquesonPropertiesofVehicleHighStrengthSteels(SchoolofAutomotiveEngineering,StateKeyLaboratoryofStructuralAnalysisforIndustrialEquipment,DalianUniversityofTechnology,Dalian116024,Liaoning,China)Abstract:Basedonthecombinationofmaterialsscienceandmechanic
2、alengineering,hotpressformingprocessofthevehiclehighstrengthsteelswasanalyzed.Thehotformingprocessinclud-ed:heatingalloysrapidlytoaustenitemicrostructures,stampingandcoolingtimely,maintainingpressureandquenching.Theresultsshowedthatmostofaustenitemicrostructurewaschangedintouniformmartensit
3、ebythehotpressformingwhilethesampleswereheatedat900。Candquenched.Theoptimaltensilestrengthandyieldstrengthwereupto1530MPaand1000MPa,respectively,andtheshapedeformationreachedabout23%.Andspringbackdefectdidnothapp-eninthesamples.Keywords:highstrengthsteel;lightweight;hotforming;martensiteAsa
4、neffectiveeconomicalenergymeasure,thelightweightdevelopmentdirectionofautomo-bilehasbecomeoneofthemostimportantresearchsubjectsintheautomotiveindustry.Therearethreemajorwaystoachieveautomobilelightweight:optimizingvehicleframesandstruc-tures;makingvehiclebodyorframeofnewandalternativemateri
5、alstoreducethevehiclemass(Thehighandultrahighstrengthsteelcanbeusedasalternativematerialsbecauseofitsthinnerthickness);adoptingadvancedmanufacturingtechniquesforthesakeofautomobilelightwei-ght,suchasthickness-gradienthighstrengthsteel(HSS)ormetalbasedcompoundplatesbycon-tinuouspressingorhot
6、pressforming[1].AlthoughHSShasbeenappliedinsomedomestictopgradevehicles,thekeyproducingtechnologieshavealwaysbeendominatedbyforeigncompan-ies,suchasAcelorCompany,soastoraisetheproductcostobviously.Bydomesticself-designedhotpressformingtechniquesandwater-coolingmould,theautomobileHSScanbepro
7、ducedtosubstituteforeignvehicleparts.Ingeneral,withtheenhancementofsteelblank，smechanicalstrength,itsformabilityisworseneddramatically.ItisdifficulttoapplythetraditionalcoldstampingtechnologyintothefieldofpressingHSS.Thus,thehotstampingtechnologyofmarten
