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