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1、東南大學碩士學位論文高碳超高強鋼簾線的顯微組織和性能研究姓名：袁偉偉申請學位級別：碩士專業(yè)：材料科學與工程；材料加工工程指導教師：吳申慶20110301AbstractSteelcordisusedasthemainreinforcementmaterialinradialtireWiththerapiddevelopmentofautomobileindustryhigherperformanceofsteelcordisrequir

2、edAlthoughsteelcordhasthesameevolutionofmicrostnlctureandpropertiescompared、撕tlIcolddrawnsteelwireithasitsowncharacteristicsWiththehighslrengthsteelcordcontinuousdevelopmentithasshownsomenewfeat盯esontheevolutionofmicrost

3、ructureandpropertiesunderhighdrawingspeedandlargedeformationThereforethestudyonmicrostructureandpropertiesinsteel’cordespeciallyinhighcarbonandsuperllighstrengthsteelcordisparticularlyimportantInthisthesis，themicrostruct

4、ureandpropertiesofhighcarbon(C=o92％wt)andsuperhighstrength(TS3500MPa)steelcordhasbeeninvestigatedduringdrawingThetorsionperformanceofthesinglefilamentshasbeenstudied，meanwhilesteelcordproductionWocesshasbeenimprovedandop

5、timiz札Themainresultsareasfollows：Theevolutionofmicros仇lctureandpropertieswereinvestigatedduringdrawingTheresultsshowedthattheorientationofthepearlitecolonyinrodisrandomThegrainsonbrosssectionbecomefill％andthemicrosma：tur

6、eonlongitudinalsectionbecomefibrosisgraduallyduringdrawingThecodeformationofpearlitiecolonyduringthedrawingprocess鋤beobservedInterlamellarspacingofpearliteinrodis136ranitdecreasedprogressivdyduringthecolddrawingprogress，

7、andInterlamellarspacingofpearliteinelectroplatedwireisllOnmTensilestrengthandhardnessofdrawnwiregraduallyincreased、^rithincreasingdrawingstrah[LThetensilestrengthofthesinglefilamentsisabove3500MPaBecauseoftheta02uFeforma

8、tionduringdrawinghardnessoncrosssectionandlongitudinalsectionisnotequalVSManalysisshowedthatcementitedissolveduringdrawingprocessTheresultsshowedthatthegreatertheamountofcementitedissolutionthelargerprobabilityoflayeredf

9、ractureduringtorsiontestThetorsionalpropertiesofthesinglefilamentswasinvestigatedinthisthesisByreversingthefracturemorphologythetorsiongalfractureisdividedintothreecategories：normaltoreversefaultthelocalcrackfractureands

10、piralfracturecracksthespiralfracturecracksisdefinedasthelayeredfractureComparisonexperimentsofdifferenttorsionconditionsWerecarriedoutforsinglefilamentspO30mm)Itisconcludedthattestconditionswith200d(diameter)asgaugelengt

11、h1％F(breakingforce)asaxialloadand60rpmastorsionspeedcanreachthehighertestprecisioIIThemicrostructureandhardnessindiffcrentpartsofthesinglefilamentshasbeeninvestigate&Theresultsshowedthattorsionaldeformationisheterogeneou

12、s，thestrainands乜essonthesurfaceofsinglefilamentsWeremaximumAnalysisshowthatinthetorsiontests，singlefilamentsbearplasticdeformationwhichcausesprimaryfracture，andevenfracturesaremainlyproducecLWhilestressstateinducedbyunlo

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