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1、铜陵学院期末论文InfluenceofHotPressFormingTechniquesonPropertiesofVehicleHighStrengthSteels(SchoolofAutomotiveEngineering,StateKeyLaboratoryofStructuralAnalysisforIndustrialEquipment,DalianUniversityofTechnology,Dalian116024,Liaoning,China)Abstract:Basedonthecombinationofmaterialsscience
2、andmechanicalengineering,hotpressformingprocessofthevehiclehighstrengthsteelswasanalyzed.Thehotformingprocessinclud-ed:heatingalloysrapidlytoaustenitemicrostructures,stampingandcoolingtimely,maintainingpressureandquenching.Theresultsshowedthatmostofaustenitemicrostructurewaschang
3、edintouniformmartensitebythehotpressformingwhilethesampleswereheatedat900。Candquenched.Theoptimaltensilestrengthandyieldstrengthwereupto1530MPaand1000MPa,respectively,andtheshapedeformationreachedabout23%.Andspringbackdefectdidnothapp-eninthesamples.Keywords:highstrengthsteel;lig
4、htweight;hotforming;martensiteAsaneffectiveeconomicalenergymeasure,thelightweightdevelopmentdirectionofautomo-bilehasbecomeoneofthemostimportantresearchsubjectsintheautomotiveindustry.Therearethreemajorwaystoachieveautomobilelightweight:optimizingvehicleframesandstruc-tures;makin
5、gvehiclebodyorframeofnewandalternativematerialstoreducethevehiclemass(Thehighandultrahighstrengthsteelcanbeusedasalternativematerialsbecauseofitsthinnerthickness);adoptingadvancedmanufacturingtechniquesforthesakeofautomobilelightwei-ght,suchasthickness-gradienthighstrengthsteel(H
6、SS)ormetalbasedcompoundplatesbycon-tinuouspressingorhotpressforming[1].AlthoughHSShasbeenappliedinsomedomestictopgradevehicles,thekeyproducingtechnologieshavealwaysbeendominatedbyforeigncompan-ies,suchasAcelorCompany,soastoraisetheproductcostobviously.Bydomesticself-designedhotpr
7、essformingtechniquesandwater-coolingmould,theautomobileHSScanbeproducedtosubstituteforeignvehicleparts.Ingeneral,withtheenhancementofsteelblank，smechanicalstrength,itsformabilityisworseneddramatically.ItisdifficulttoapplythetraditionalcoldstampingtechnologyintothefieldofpressingH
8、SS.Thus,thehotstampingtechnologyofmarten
