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1、聯(lián)系人：李朝鋒，聯(lián)系人：李朝鋒，26647182InfluenceofHeatTreatmentProcessonMechanicalPropertiesofanHSLA100steelLIChaofeng1ZHANGYongjiaMAZhaohui(1.ResearchInstitutefAdvancedStructuralSteelRitwasanothercopperagehardenablesteelwhichwasdevelo

2、pedindertoenhancetheyieldstrengthbasedonthesuccessfulstudyontheHSLA80steel.Thebehaviofthecopperprecipitationhadbeenstudiedbyvariouscountriesthemainacteristicofthesteelwascopperprecipitationtoenhancethestrengthtomakeupfth

3、elostofcarbon[15].IndertoenhancethestrengthtoughnessNi、Cr、MowereaddedtocontroltheMicrostructurechangedfromferritepearlitetomartensitebainite.Thecompositionsofthesteelhadlowcarboncontentsabout0.06%toimprovetheweldablility

4、ofthesteel.TheconditionofdeliveryoftheHSLA100steelwasquenchedtempered.Withthedevelopmentoftherollingequipmentthecontrolrollingcontrolcoolingtechnologytheonlinedirectquenchingprocess(DQ)wasappliedtoenhancethestrengththeto

5、ughnessofthesteelitwascometruetoreplacetheconventionalofflinereheatingquenching(RQ)processbytheDQprocess.ThegrainswererefinedwiththeacceleratecoolingthestrengthtoughnesswerehigherthantheRQTwithhigherhardenabilitysimultan

6、eouslytoreducethecostoftheproducts.ThispaperwasmainlyconcernedwiththeDQprocesswiththeHSLA100steeltheexperimentoftheRQprocesscomparedwiththeDQprocesswerecarriedout.1LichaofengResearchInstitutefAdvancedStructuralSteelR&DCe

7、nterBAOSTEEL02126647182Email：licf@Fig1StaticCCT(continuouscoolingtransfmation)CurveofHSLA100steel2.2ResultsofreheatingquenchedtemperedprocessThemechanicalpropertiesresultsofreheatingquenchedtemperedprocessareshownintable

8、2itshownthatthesteelshavehighstrengthhightoughnessatlowtemperature.Theplatesthicknessare16、2540mmtheimpactabsbenergyat85℃arerespectively220~258J184~250Jtheareaoftheshearfracturearefullyductility.FromtheSEMoffractographya

9、refullydimpleitshownthesteelshavegoodtoughnessatlowtemperature.Table2ThemechanicalpropertiesresultsofreheatingquenchingtemperedAkvJFA%GaugemmYSMPaTSMPaA%Z%85℃100℃85℃100℃Stard≥690recd≥20≥811675075085085523.526.568.571.512

10、611710811713210210010010010085902573073080079522.522.577.577.02502582372372432371001001001001001002573574085085022.522.574.074.5237213222189211228100100100801001004071069581081026.026.078.078.0222234250215204205100100100

11、9081824085084587587523.024.073.575.01681851841621681776063634850532.3ResultsofdirectquenchingtemperedprocessThemechanicalpropertiesresultsofDQTprocessareshownintable3.ComparedwiththeofflineRQTresultsthehigherstrengthwasg

12、ainedwiththeDQTprocessthoughtthetoughnessweredecreaselittle.AnotherheattreatmentwascarriedoutlikesdualphasequenchingprocesstoincreasethetoughnessofDQTprocesstheresultsshownintable3(fromNo.5toNo.8)indicatedthetoughnesswer

13、esignificationenhanceditwerecrespondencewiththeDQT.ItindicatedthattheDQQ’(dualphasequenching)TcanimprovethebalancetothestrengththetoughnessitwasamodifiedheattreatmentprocessoftheRQTprocess.Table3Themechanicalpropertiesre

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